In 2003, the United Nations (UN) adopted the Globally Harmonized System of Classification and Labeling of Chemicals (GHS)
In 2003, the United Nations (UN) adopted the Globally Harmonized System of Classification and Labeling of Chemicals (GHS). The GHS includes criteria for the classification of health, physical and environmental hazards, as well as specifying what information should be included on labels of hazardous chemicals as well as safety data sheets. The United States was an active participant in the development of the GHS, and is a member of the UN bodies established to maintain and coordinate implementation of the system. The official text of the GHS can be found on the UN web page.
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Cconsider the directing effects of the substituents on salicylamide and predict the possible structures of the iodination products.
The directing effect of the amide group in salicylamide is meta, which will predominantly lead to iodination products at the meta position relative to the amide group.
Salicylamide is an aromatic amide with the molecular formula C7H7NO2. It contains a benzene ring and an amide functional group (-CONH2) attached to it.
Substituents can have directing effects on the ring during electrophilic aromatic substitution reactions. There are two main types of directing effects:
Ortho-para directing: Substituents that are ortho-para directing enhance electrophilic attack at the ortho and para positions (positions 2 and 4) relative to the substituent.
Meta directing: Substituents that are meta directing enhance electrophilic attack at the meta position (position 3) relative to the substituent.
In the case of salicylamide, the amide group is a meta-director due to the electron-withdrawing effect of the carbonyl group. Therefore, the iodination products of salicylamide will predominantly occur at the meta position.
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An NaCl solution is prepared by dissolving 50.0 g NaCl in 200.0 g ofwater at 25"C What is the vapor pressure of the solution if the vapor pressure of water at 25*C is 23.56 torr? a.1.574 torr b.1.686 tOrr c.20.41 torr d.0.8744 torr e.21.87 torr
The vapor pressure of the solution if the vapor pressure of water at 25 °C is 23.56 torr is 21.87 torr. The correct option is e. 21.87 torr.
The mass of the NaCl = 50 g
The moles of the NaCl = mass / molar mass
= 50 / 58.44
= 0.855 mol
The mass of the H₂O = 200 g
The moles of the H₂O = mass / molar mass
= 200 / 18
= 11.11 mol
The total moles = 11.96 mol
The mole fraction of the water = moles of water / total moles
= 11.11 / 11.96
= 0.928
The vapor pressures of the solution = mole fraction of water × vapor pressure of water
The vapor pressures of the solution = 0.928 × 23.56
= 21.87 torr
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What term is used to describe the substance that is totally consumed in a chemical reaction?
Reactant term is used to describe the substance that is totally consumed in a chemical reaction.
What are reactants?
Reactants are the substances that enter into and are used up in a chemical reaction. They are the starting materials that come together to form the products of the reaction. Reactants are found on the left side of the equation for a chemical reaction, and the products are found on the right side. Reactants are often referred to as substrates, as they are the substances from which the reaction builds the products. All chemical reactions involve the combining of at least two reactants, usually in the presence of a catalyst. Understanding the reactants involved in a reaction is essential to understanding the reaction itself.
Therefore, Reactant term is used to describe the substance that is totally consumed in a chemical reaction.
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Why pentane has low boiling point?
Pentane has a low boiling point because it is a relatively small and nonpolar molecule. The temperatur where used start Pentane boiling
30.1 °C
Boiling point is determined by the strength of intermolecular forces between molecules, and nonpolar molecules like pentane have weak intermolecular forces. The only intermolecular force present in pentane is London dispersion force, which arises due to temporary fluctuations in electron density within the molecule.
Since London dispersion force is weak, it requires less energy to overcome the intermolecular forces and separate the molecules from one another, which means that pentane will boil at a relatively low temperature compared to larger and more polar molecules with stronger intermolecular forces. the boiling point of a liquid is determined by the temperature at which its vapor pressure equals the atmospheric pressure. At lower pressures, liquids boil at lower temperatures, while at higher pressures, they boil at higher temperatures.
In the case of pentane, its weak intermolecular forces result in a low surface tension, which makes it easier for the molecules to escape from the surface and enter the gas phase. This leads to a higher vapor pressure at a given temperature compared to larger and more polar molecules. As a result, pentane will boil at a lower temperature than those larger and more polar molecules, which require more energy to overcome stronger intermolecular forces and enter the gas phase.
That there are different isomers of pentane, including n-pentane, iso-pentane, and neo-pentane, and their boiling points can differ slightly due to differences in their molecular structures. However, in general, pentane is known for having a low boiling point, which makes it useful in many industrial applications such as as a solvent or a component in fuel blends.
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which two plates that share a boundary are moving the fastest from each other? do these data match the GPS data?
The primary plates move at speeds ranging from under 1 cm/y to over 10 cm/y. The Australian and Nazca Plates are the next fastest plates, moving at rates of above 10 cm/y in some places.
What is GPS data ?A network of satellites and receiving equipment called the global positioning system (GPS) is used to locate objects on Earth. Certain GPS receivers have a precision of one centimetre, allowing them to pinpoint their location (0.4 inches).
As a result, shifting of the Earth's surface is what causes changes in a GPS station's position. Scientists can identify tectonic plate motion and infer crustal deformation by analyzing the mobility of numerous GPS sites in a region over time.
Thus, One of the slowest plates is the North American one, with average rates ranging from 1 cm/yr in the south to roughly 4 cm/yr in the north.
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How to Determine the Highest Ionization Energy
The highest ionization energy can be determined by looking at the periodic table and finding the element with the highest atomic number. This element will have the highest ionization energy as it requires the most energy to remove an electron from its outermost shell.
Ionization energy is the energy required to remove an electron from an atom or ion. The amount of ionization energy is dependent on the atomic structure of the element. The more electrons an atom has, the more energy is required to remove one. Therefore, as the atomic number increases, so does the ionization energy.
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Two gas
molecules collide together in a box container. Which reaction
accurately portrays the kinetic molecular theory?
Gas molecules are assumed to be in constant random motion and to collide perfectly elastically with one another in this theory. They bounce off one another. These particles are assumed to be spherical. There are also no interactions between the molecules.
What is kinetic molecular theory ?According to kinetic molecular theory, gas particles are in constant motion and have perfectly elastic collisions. Both Charles' and Boyle's laws can be explained using kinetic molecular theory. The average kinetic energy of a gas particle collection is only proportional to absolute temperature.
Collisions are perfectly elastic; when two molecules collide, their kinetic energies and directions change, but the total kinetic energy remains constant. Collisions do not have a "sticky" effect. The absolute temperature is directly proportional to the average kinetic energy of the gas molecules.
Thus,The two molecules will stay together because they are attracted to each other.
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How many grams of salt (NaCl) do you need to make 200 mL of a 0.5M solution? The molar mass of NaCl is 58.44 g/mol.
The mass (in grams) of the salt (NaCl) needed to make the 200 mL of the 0.5 M solution is 5.844g
How do I determine the mass of the salt (NaCl) needed?First, we shall determine the mole of the salt (NaCl). Details below:
Molarity of solution = 0.5 MVolume = 200 mL = 200 / 1000 = 0.2 LMole of salt (NaCl) =?Mole = Molarity × volume
Mole of salt (NaCl) = 0.5 × 0.2
Mole of salt (NaCl) = 0.1 mole
Haven obtain the mole of the salt, we shall determine the mass of salt (NaCl) needed to make the solution. This is shown below:
Mole of salt (NaCl) = 0.1 moleMolar mass of salt (NaCl) = 58.44 g/molMass of salt (NaCl) = ?Mass = Mole × molar mass
Mass of salt (NaCl) = 0.1 × 58.44
Mass of salt (NaCl) = 5.844g
Thus, the mass of the salt (NaCl) needed is 5.844g
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How do you determine the mechanism of a reaction?
The mechanism of a reaction can be determine by the overall sequence of the elementary reactions is called as the mechanism of the reaction.
The mechanism of the reaction is the sum of all the individual steps, or the elementary reactions, in the mechanism that provides the balanced chemical equation of the overall reaction. The overall sequence of the elementary reactions is called as the mechanism of the reaction.
A mechanism of the is the step by the step sequence of the elementary reactions by which the overall chemical change is occurs. The mechanism of the reaction is the actual process by which the reaction takes place.
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Select all the characteristics that apply to an atomic orbital. Defined by the wave function (á´ª). A region around the nucleus of an atom where the probability of finding an electron is high A shell in an atom containing the valance electrons Identified by a unique combination of four quantum numbers; identified by a unique combination of three quantum numbers Defined by the square o' the wave function (á´ª^2)
What are atomic orbital?
An atomic orbital is a function that describes the position and wave-like activity of an electron in an atom in terms of both atomic theory and quantum mechanics. This function can be used to determine the likelihood of discovering any atom's electron in any particular area surrounding the nucleus. The physical area or space where the electron may be calculated to be present, as predicted by the specific mathematical shape of the orbital, is sometimes referred to as an atomic orbital.
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A greenhouse is filled with air that contains more carbon dioxide that normal air has. How might phtosynthesis and plant growth be affected?
A greenhouse is filled with air that contains more carbon dioxide that normal air has. The phtosynthesis and plant might growth be affected is can potentially lead to faster plant growth and increased rate of photosynthesis
Plants rely on photosynthesis to create energy, which they use for growth and other cellular functions. Photosynthesis is the process by which plants convert carbon dioxide and water into glucose and oxygen using energy from the sun. When a greenhouse is filled with air that contains more carbon dioxide than normal air, the rate of photosynthesis can increase, leading to faster plant growth.
However, it is important to note that there are other factors that affect plant growth and photosynthesis, such as the availability of water and nutrients, and the intensity and duration of sunlight. If these factors are not optimal, an increase in carbon dioxide alone may not lead to faster plant growth. In conclusion, a greenhouse filled with air that contains more carbon dioxide than normal air can potentially lead to faster plant growth and increased rates of photosynthesis, but other factors such as water, nutrients, and sunlight must also be considered.
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In the reaction 2 HgO —> 2 Hg + O2, how many miles of O2 are produced when 0. 1 miles of HgO are decomposed?
In the reaction 2 HgO —> 2 Hg + O₂, 0.05 moles of O₂ are produced when 0.1 moles of HgO are decomposed.
Balanced chemical equationThe balanced chemical equation for the reaction is:
2 HgO —> 2 Hg + O₂
This equation tells us that for every 2 moles of HgO that decompose, 1 mole of O₂ is produced. We can use this relationship to determine how many moles of O2 are produced when 0.1 moles of HgO are decomposed.
To do this, we can use the following equation:
moles of O₂ = (moles of HgO) * (1 mole of O₂ / 2 moles of HgO)
Plugging in the given value of 0.1 moles of HgO, we get:
moles of O₂ = (0.1 moles of HgO) * (1 mole of O₂ / 2 moles of HgO)
Simplifying the equation, we get:
moles of O₂ = 0.05 moles of O₂
Therefore, 0.05 moles of O₂ are produced when 0.1 moles of HgO are decomposed.
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You are required to go to the lab and test the combustion of calcium carbonate. Calcium carbonate is a white mineral. You burned calcium carbonate, CaCO3, to produce carbon dioxide, CO2, and a white powder, CaO.
a. By referring to the given, write down the chemical equation.
b. Compare the properties of the products and reactants in this reaction.
c. Use numbers of atoms to describe the amounts of calcium, carbon, and oxygen before and after the reaction.
d. Explain where the equation shows the conservation of matter.
e. Research another specific chemical reaction and create a poster to explain what happens during the reaction.
f. Design an experiment to test the reaction of two substances and record observations. Be specific about the substances and the observations.
Step-by-step Explanation:
a. [tex]CaCO_{3}[/tex] → [tex]CaO[/tex] + [tex]CO_{2}[/tex]
This is the balanced chemical equation for the combustion of Calcium carbonate.
b. Properties of [tex]CaCO_{3}[/tex] :
Odorless, white powderWater-insolubleCommon name - limestoneProperties of [tex]CaO[/tex] :
Amorphous white solidSoluble in water and glycerolCommon name - quicklimeIonic bond between Calcium and OxygenProperties of [tex]CO_{2}[/tex] :
One of the most popular greenhouse gasColorless, odorless, non-flammable gasWater-soluble - dissolves in water to form carbonic acidIt is 1.5 times heavier than airCooling of carbon dioxide liquid forms dry iceIt reacts with alkalis like NaOH to form carbonates which on further hydration gives bicarbonates.When passed through lime water, carbon dioxide turns limewater milky.c. According the above equation, number of atoms on both sides are equal.
Before reaction: Ca = 1, C = 1, O = 3
After reaction: Ca = 1, C = 1, O = 1 + 2 = 3
d. The law of conservation of matter states that the total mass and kind of elements in the reactants is equal to the total mass and kind of elements in the products. Thus matter cannot be created not destroyed, it can only be conserved. From the chemical equation, we get to know that the mass and number of atoms of all the elements is equal in the reactants and products. Thus we can prove the conservation of matter.
e. Combustion of Sodium Carbonate:
[tex]Na_{2} CO_{3}[/tex] → [tex]Na_{2}O + CO_{2}[/tex]
In this reaction, sodium carbonate undergoes combustion at temperature > 500°C and forms sodium oxide and carbon dioxide.
f. The following results are achieved when a chemical reaction occurs:
Change in stateChange in colorEvolution of a gasChange in temperatureWater and calcium oxide react quickly to form calcium hydroxide. A significant amount of heat is also released during this process, raising the system's temperature. This demonstrates that there was a chemical reaction.
Calcium carbonate breaks down into calcium oxide and carbon dioxide when heated. Here, the evolution of gas (carbon dioxide) proves that a chemical reaction has occurred.
The human body can breath in over 6.70 x 10^22 molecules of oxygen (O₂) a second. How many liters is this, if you are at STP?
The volume that is occupied is 22.4 L
What is the definition of the mole?The mole allows for the conversion of the mass of a substance to the number of entities it contains, and vice versa, through the use of its molar mass, which is the mass of one mole of the substance. The mole is a convenient unit for expressing amounts of substances in chemical reactions, as it provides a way to relate the mass of a substance to its number of entities, such as atoms or molecules.
If one mole of oxygen contain 6.02 * 10^23 moles
x moles would contain 6.70 x 10^22 molecules
x = 1 mole
Then the volume that is occupies is 22.4 L
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Classify each given species as a strong acid, weak acid, strong base or weak base.Ba(OH)2 HF CH3COOH HClO4 HNO3KOH Sr(OH)2 H3PO4 NH3 NaOHLiOH HBr HCl H2SO4 Ca(OH)2Strong Acid Weak Acid Strong Base Weak Base
Answer:
Strong acid: HCl, HClO4, HNO3, HBr, H2SO4
Strong Base: Ba(OH)2, KOH, Sr(OH)2, LiOH, NaOH, Ca(OH)2
Weak Acid: HF, CH3COOH, H3PO4
Weak Base: NH3
Explanation:
in a spectrophotometer, both absorbance and transmittance indicate
In a spectrophotometer, both absorbance and transmittance indicate the amount of light passing through a sample. A high absorbance corresponds to a low transmittance.
Absorbance and transmittance are light-sample interactions measured by spectrophotometers. Absorbance and transmittance are inversely connected and can quantify how much light a sample absorbs at a specific wavelength.
"A" represents a sample's light absorption, which is proportional to its absorbing material concentration. A beam of light is sent through the sample to measure absorbance. Concentration increases light absorption and absorbance.
Transmittance (T) measures how much light travels through a sample without being absorbed. Transmittance is the ratio of light that goes through the sample to light that hits it. Transmittance increases as light absorption decreases.
In summary, absorbance and transmittance measure light's interaction with a sample and estimate the concentration of an absorbing substance.
The complete question is;
In a spectrophotometer, both absorbance and transmittance indicate _______Passing through a sample. A high absorbance corresponds to a _______Transmittance.
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A cup of coffee can have up to 0.250 grams of caffeine,C8H10N4O2. How many molecules of caffeine would be in the coffee?
A cup of coffee can have up to 0.250 grams of caffeine,C8H10N4O2. 0.007 x 10²³ molecules of caffeine would be in the coffee.
What is mole ?The term mole is defined as the amount of substance of a system which contains as many elementary entities.
1 mole is equal to 6.023 × 10 ²³ molecules.
Given mass of caffeine, C8H10N4O2 is 0.250 g
Molar mass of C8H10N4O2 is 194 g/mol
So number of moles of C8H10N4O2 is , n = mass/molar mass
= 0.250/(194 g/mol)
= 0.0012 mol
We know that 1 mole of any compound contains Avogadro number (6.023x10²³) molecules
Therefore, 1 mole of caffeine contains 6.023x1023 molecules
0.0012 mol of caffeine contains M molecules
M = 0.0012 mol x 6.023x10²³ molecules
= 0.007 x 10²³ molecules
Thus, 0.007 x 10²³ molecules of caffeine would be in the coffee.
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I am making soda pop. I have 142.5
grams of carbon dioxide gas. How
many molecules is this, if I am at
normal conditions?
There would be 1.9 * 10^24 molecules
What is the mole concept?The mole concept is a fundamental idea in chemistry that allows for the conversion of the amount of a substance, usually expressed in grams, to the number of entities it contains, such as atoms, molecules, or ions. The mole provides a way to relate the mass of a substance to the number of entities it contains, which is important in many chemical calculations, such as stoichiometry, where the mole is used to balance chemical equations and calculate the amount of reactants and products involved in a reaction.
We know that;
\Number of moles = Mass/Molar mass
= 142.5 grams /44 g/mol
= 3.2 moles
If 1 mole would have 6.02 * 10^23 molecules
3.2 moles would have 3.2 * 6.02 * 10^23 molecules/1 mole
= 1.9 * 10^24 molecules
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select all the statements that correctly describe organometallic reagents.
Organometallic reagents are good nucleophiles and strong bases.
Organometallic reagents are ionic since they contain a bond between a metal and a nonmetal.
Organometallic reagents are a source of electrophilic carbon.
These reagents contain a polar carbon-metal bond.
Organometallic reagents are good nucleophiles and strong bases, and contain a polar carbon-metal bond.
Organometallic compounds are molecules that contain at least one covalent bond between a carbon atom and a metal atom. The metal in these compounds is typically an element from the groups 1 to 3, 11 to 13, or 15 to 17 of the periodic table, and the carbon is typically sp-, sp2-, or sp3-hybridized.
Therefore, the following two statements are correct:
Organometallic reagents are good nucleophiles and strong bases.
These reagents contain a polar carbon-metal bond.
The other two statements are not correct:
Organometallic reagents are not ionic since they typically contain a bond between a metal and a carbon, which is a nonmetal.
Organometallic reagents are not a source of electrophilic carbon, but rather a source of nucleophilic carbon.
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Question: Acid-Base Titration Pre-Lab Questions 1. Prepare For It! Prelab Question A 18.0 ML Of A 0.150 M NAOH Solution Is Required To Neutralize 25.0 ML Of An HCl Solution, What Is The Concentration Of The HCl Solution 2. Prepare For It! Prelab Question B If 12.0 ML Of A 0.210 M NAOH Solution Are Required To Neutralize 10.0 ML Of A Sulfuric Acid Solution What Is The
The concentration of the sulfuric acid solution is 0.252 M.
1. To find the concentration of the HCl solution, we can use the equation M1V1 = M2V2, where M1 and V1 are the molarity and volume of the first solution, and M2 and V2 are the molarity and volume of the second solution.
Rearranging the equation to solve for the concentration of the HCl solution, we get:
M2 = (M1V1)/V2
Plugging in the given values, we get:
M2 = (0.150 M)(18.0 mL)/(25.0 mL) = 0.108 M
Therefore, the concentration of the HCl solution is 0.108 M.
2. To find the concentration of the sulfuric acid solution, we can use the same equation, M1V1 = M2V2. Rearranging the equation to solve for the concentration of the sulfuric acid solution, we get:
M2 = (M1V1)/V2
Plugging in the given values, we get:
M2 = (0.210 M)(12.0 mL)/(10.0 mL) = 0.252 M
Therefore, the concentration of the sulfuric acid solution is 0.252 M.
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how many gallons of a % antifreeze solution must be mixed with gallons of % antifreeze to get a mixture that is % antifreeze? use the six-step method.
There are 490 gallons of a 70 % antifreeze solution must be mixed with gallons of % antifreeze to get a mixture that is 30 % antifreeze.
An equation can be created using the relationship between each antifreeze proportion.
The required amount of 90% antifreeze is 490 gallons.
The query is unfinished. I will thus address the query using the following information.
Antifreeze available = 70 gallons at 10%
Gallons of 90% antifreeze equal x.
Total = x + 70 to obtain an 80% solution after combining the solution.
The formula is therefore written as follows:
(x+70) x 80% = 70x 10% + x 90%
assemble similar terms
0.9x +0.8x = 56-7
0.1 x= 49
Divide by 0.1 and get 490.
Your question is incomplete but most probably your full question was
How many gallons of a 70% antifreeze solution must be mixed with gallons of 90% antifreeze to get a mixture that is 30% antifreeze? Use the six-step method.
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Proton A couples to Proton B. Proton A posseses a J-value of 3.0 Hz. What do you expect the J-value Proton B posseses to be? A. 3.0 Hz B. Less than 3.0 Hz C. No J-value because coupling is only one-way D. Greater than 3.0 Hz
The J-value Proton B possesses to be A. 3.0 Hz that is explained in the below section.
The J value is described because the elastic capacity distinction among the linear and nonlinear elastic our bodies with the identical geometric variable. The J value of a quartet can usually be decided via way of means of measuring the distances among man or woman lines. With actual data, it's miles fine to take the common distance among lines (which is likewise the space among the primary and closing line divided via way of means of three). Example: t, J = 6 Hz (DRAW A SPLITTING TREE AND GRAPH THE MULTIPLET. The coupling constant, J (typically in frequency units, Hz) is a degree of the interplay among a couple of protons.
Thus, option A is the correct choice.
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How do you balance this chemical equation:
CaCO2 = CaO + CO2
In other words, the mass as well as charge across both sides of the reactions are balanced. Therefore, the balanced equation is CaCO[tex]_3[/tex]→ CaO + CO[tex]_2[/tex].
What is balanced equation?A balanced equation is indeed a chemical reaction equation in which the overall charge and the amount of atoms for every element inside the reaction are the same for both the products and the reactants.
In other words, the mass as well as charge across both sides of the reactions are balanced.
CaCO[tex]_3[/tex]→ CaO + CO[tex]_2[/tex]
The atom oc Ca on reactant and product side is 1.
The atom of oxygen on reactant and product side is 3
The atom of carbon on reactant and product side is 1
Therefore, the balanced equation is CaCO[tex]_3[/tex]→ CaO + CO[tex]_2[/tex].
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Question: A Pipet Is Used To Measure Out 10 ML Of Water. If The Mass Of This Volume Of Water Is 9.990 G And The Density Of Water Is Given As 0.9978 G/ML, What Is The Actual Volume Of Water Measured Out? O 10.000 ML 9.990 ML O The Actual Volume Measured Out Is Impossible To Tell 10.012 ML
10mL of water in SX at 0.00003 g/cm3 The average density value in g/cm3 is 0.9982 and was calibrated at 15°C, 20°C, and 25°C.
What measurement of volume is 10 mL?Two teaspoons are equal to 10 mL. (2tsp). Three teaspoons make to one tablespoon, which is three times larger than a teaspoon (1Tbsp or 1Tb). 15 mL is also equal to one tablespoon.
Is 1 mg the same as 10 ml?The result is calculated by multiplying the entered milligramme by 0.001, since 1 milligramme is equal to 0.001 millilitres. When there are 15 milligrammes, for instance, 15 x 0.001 is 0.015 mL in the conversion of milligrammes to milliLitres.
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Why benzoic acid is less soluble in water but it is soluble in basic solution?
Benzoic acid is a weak acid that has a low solubility in water due to its polarity and its tendency to form hydrogen bonds with other water molecules.
What is solubility?
Solubility is the ability of a substance (the solute) to dissolve in a solvent to form a homogeneous mixture (the solution). The solubility of a substance depends on a variety of factors, including the chemical properties of the solute and solvent, temperature, and pressure.
The carboxylic acid group in benzoic acid is a polar functional group that is attracted to water molecules, but the hydrocarbon chain in benzoic acid is nonpolar and is not attracted to water molecules. As a result, the solubility of benzoic acid in water is limited.
However, when benzoic acid is dissolved in a basic solution, it forms the water-soluble benzoate anion (C6H5COO-), which has a higher solubility in water due to its increased polarity. This occurs because the benzoic acid reacts with the hydroxide ions in the basic solution to form the benzoate anion:
C6H5COOH + OH- → C6H5COO- + H2O
The benzoate anion is negatively charged and is attracted to the positively charged ends of water molecules, increasing its solubility in water.
In summary, benzoic acid is less soluble in water due to its low polarity and the nonpolar hydrocarbon chain, but it becomes more soluble in basic solution as it is converted to the more polar benzoate anion.
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when combining a strong acid with water to dilute it, you should add the acid to the water.true or false
The statement (when combining a strong acid with water to dilute it, you should add the acid to the water) is false because adding acid to water can cause the acid to splash and perhaps cause harm.
Always add the acid to the water rather than the water to the acid when diluting a strong acid with water. This is so that the solution won't boil over or spatter when mixing a strong acid with water, which can generate a lot of heat. When acid is added to water, any splattering is contained within the larger volume of water.
The proper way to ensure that the heat is dispersed and the acid is diluted properly is to add the concentrated acid to a big amount of water slowly, cautiously, and while stirring the mixture.
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Orla and eduardo each looked at a strand of their hair under a microscope and measured the diameter. Orla's strand was 0. 005 cm 0. 005cm0, point, 005, start text, c, m, end text in diameter, and eduardo's strand was 0. 012 cm 0. 012cm0, point, 012, start text, c, m, end text in diameter.
The diameter of Eduarduo,s hair is greater than Orla,s hair by 0.007cm.
A diameter of a circle is any straight line segment that passes through the centre of the circle and has endpoints on the circle in geometry. It is also known as the circle's longest chord. Both definitions apply to the diameter of a sphere.
Given:- The diameter of Orla,s hair strand is 0.005cm.
The diameter of Eduarduo hair strand is 0.012cm.
Clearly, 0.012>0.005cm.
The difference between the diameters= 0.012-0.005=0.007cm.
Thus the diameter of Eduarduo hair is greater than Orla hair by 0.007cm.
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Use the balanced equation for the reaction of lithium oxide with water
Li₂O(s) + H₂O(g) --> 2 LiOH(s)
to determine how many grams of H₂O can be removed from the air by 250 g of Li₂O. Be
sure to include units, identify the substances, and use the proper number of significant
figures. You may not need to use all the boxes to complete the problem.
From the balanced equation, it is clear that, one mole or 28 g of lithium oxide is reacting with one mole or 18 g of water. Then, 250 g of lithium oxide will remove 160.71 g of water.
What is balanced chemical equation ?The balanced chemical equation of a reaction represents the perfect stoichiometric proportions of all the reactants and products in the reaction. The mole ratio of each reactants and the theoretical yield of the product can be determined from the balanced equation.
From the given equation, it is clear that, one mole of lithium oxide reacts completely with one mole of water.
molar mass of lithium oxide = 28 g/mol
molar mass of water = 18 g/mol
Hence, 28 g of lithium oxide reacts 18 g of water. Then , 250 g of lithium oxide requires:
(250 × 18)/28 = 160.7 g of water.
Therefore, 160.7 g of water is removed by 250 g of lithium oxide.
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how to write lewis structure so3?
The lewis structure of the SO₃ is as follows :
: O :
||
: O : = S = : O :
The total valence electron in the sulfur trioxide is 24 electrons. The structure of the sulfur trioxide is the trigonal pyramidal, and the double bond is formed and there are no lone pair of the electrons on the central atom the sulfur. The Sulfur trioxide does not have the charge and the oxygen atoms are more electronegative that the sulfur surrenders the electron around, this is because the sulfur is the weak as compared to the oxygen. The lewis structure is as follows :
: O :
||
: O : = S = : O :
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What is the Lewis structure for HBr?
The final Lewis structure for HBr is:
:Br:
.. ..
H - :
.. ..
The Lewis structure for HBr is as follows:
H - Br
In this structure, the hydrogen atom (H) and the bromine atom (Br) are bonded together by a single covalent bond. This is represented by the dash (-) between the two atoms. The Lewis structure shows the arrangement of the valence electrons around the atoms in a molecule.
To draw the Lewis structure for HBr, we first need to determine the number of valence electrons for each atom. Hydrogen has 1 valence electron and bromine has 7 valence electrons.
Next, we need to arrange the atoms and connect them with a single bond. The hydrogen atom is placed on one side of the bromine atom and a single bond is drawn between them.
Finally, we need to complete the octets for the atoms by adding lone pairs of electrons around the bromine atom. Bromine needs 7 more electrons to complete its octet, so we add 3 lone pairs of electrons around it.
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