The set of compounds that will form a near neutral aqueous solution when individually dissolved in water is D. HC2H302, SO3, and NH3.
Which compounds create a near neutral aqueous solution?When a compound dissolves in water, it can either release or accept protons, resulting in an acidic or basic solution. Compounds that release protons, such as acids, make the solution acidic, while compounds that accept protons, such as bases, make the solution basic.
To form a near neutral aqueous solution, we need compounds that neither release nor accept protons significantly.
Among the given options, HC2H302 (acetic acid) is a weak acid that releases a small number of protons. SO3 (sulfur trioxide) is a highly reactive compound that can react with water to form sulfuric acid (a strong acid), making the solution acidic.
Bao (barium oxide) is a strong base that readily accepts protons, making the solution basic.
However, NH3 (ammonia) is a weak base that accepts protons to a limited extent, resulting in a slightly basic solution. Therefore, the combination of HC2H302, SO3, and NH3 is the only set of compounds that can form a near neutral aqueous solution when individually dissolved in water.
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Assume that helium behaves as an ideal gas. what is the estimated density of 1.0 g of helium gas at a temperature of 27 °c and a pressure of 3.0 atm? (note: use r = 0.0821 l∙atm∙mol−1∙k−1)
The density of the helium gas is 0.487 g/L
Calculation,
According to Ideal gas equation,
PV = nRT ...(I)
The values of some terms are given as,
P is the pressure = 3 atm
V is the volume = ?
T is the temperature = 27°C = 27°C + 273 = 300 K
R is the universal gas constant = 0.0821 L∙atm∙mol−1∙K−1
n is the number of moles of helium = given mass of helium/molar mass of helium
n is the number of moles of helium = 1 g/ 4 g/mole = 0.25 mole
So, by putting the value of all data given in the equation (i) we get,
3 atm × V = 0.25 mol ×0.0821 L∙atm∙mol−1∙K−1×300 K
V = 0.25 mol ×0.0821 L∙atm∙mol−1∙K−1×300 K/3 atm
V = 2.05 L
The formula of density = given mass /volume = 1g/2.05 L = 0.487 g/L
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Ionic compounds are ______ at room temperature and generally have ______ melting and boiling points.
Thus all ionic compounds are solids at room temperature and generally they have very high melting and boiling points.
There are strong electrostatic attractive forces between the positive and negative ions in ionic solids. These extremely powerful forces must be overcome in order to melt the solid. As a result, all ionic compounds are solids at room temperature and have extremely high melting and boiling points.
E.g. MgF2 has a melting point of. 1261°C and a boiling point of 2239°C
The strong forces between the ions are difficult to break, which also explains why ionic compound crystals are hard. Ionic substances form massive ionic lattices with oppositely charged ions.
What are the characteristics of ionic compounds?Ionic compounds are made up of charged particles known as ions. It has a massive lattice structure with strong electrostatic attraction forces. Giant ionic lattices are regular structures found in ionic compounds.
In Chemistry, some examples of ionic compounds are:
Sodium chloride.Sodium oxide.Lithium chloride.Aluminum chloride.Potassium bromide.Learn more about ionic compounds:
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A diprotic acid is titrated with a strong base. The pH at the first half-equivalence point is 3.27. The pH at the second half-equivalence point is 8.53. What is the value of ka2
A diprotic acid is titrated with a strong base. The pH at the first half-equivalence point is 3.27. The pH at the second half-equivalence point is 8.53. The value of ka2 is 27.89.
What is pH ?pH is used to measure whether the substance is acidic, basic or neutral and the range is 0-14. If the pH is less than 7 then the solution is acidic in nature. if the pH is more than 7 then the solution is basic in solution. If the pH is equal to 7 then the solution is neutral in nature.
How to find the polyprotic value ?To find the polyprotic value
[tex]K_{a_2}[/tex] = pH of first half equivalence point × pH of second half equivalence point
[tex]K_{a_2}[/tex] = 3.27 × 8.53
= 27.89
Thus from the above conclusion we can say that A diprotic acid is titrated with a strong base. The pH at the first half-equivalence point is 3.27. The pH at the second half-equivalence point is 8.53. The value of ka2 is 27.89.
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A certain mass of nitrogen gas occupies a volume of 8.56 L at a pressure of 3.72 atm. At what pressure will the volume of this sample be 10.94 L
The final pressure of the nitrogen gas with the increase in volume is 2.91 atm.
What is Boyle's Law?Boyle’s law is a gas law that states that the pressure exerted by a gas (of a given mass, kept at a constant temperature) is inversely proportional to the volume occupied by it.
The relation can be given as:
[tex]P_1V_1=P_2V_2[/tex]
The initial pressure of the gas, [tex]P_1[/tex] = 3.72 atm
The initial volume of the gas, [tex]V_1[/tex] = 8.56L
The final volume of the gas, [tex]V_2[/tex] = 10.94 L
Substituting the values, the final pressure [tex]P_2[/tex] is given as:
3.72 × 8.56 = [tex]P_2[/tex] × 10.94
[tex]P_2 =\frac{3.72 * 8.56}{10.94} \\\\P_2 =2.91 atm[/tex]
Therefore, the final pressure of the nitrogen gas with the increase in volume is 2.91 atm.
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121) The sugar sucrose has 12 carbon atoms, 22 hydrogen atoms and 11 oxygen
atoms. How would this be written?
A) Co12H22O1
B) CI2H22011
C) C6H1206
D) CacH1206
122) How are the elements organized on the periodic table?
A) Atomic Mass
B) Element Name
C) Symbol
D) No Set Organization
123) Which of the following elements would be considered a compound?
A) CH
B) Si
C)F
D) O6
124) The formula for water is H2O meaning there are 2 Hydrogen atoms and 1
Oxygen. What is the atomic mass of one molecule to the nearest hundredth?
A) 15.99
B) 16.99
C) 17.99
D) 18.99
Answer:
Explanation:
121) The sugar sucrose has 12 carbon atoms, 22 hydrogen atoms and 11 oxygen
atoms. How would this be written?
A) Co12H22O1 [Co is cobalt]
B) CI2H22011 [Yes]
C) C6H1206 [6 C atoms]
D) CacH1206 [Ca is calcium]
122) How are the elements organized on the periodic table?
A) Atomic Mass [Yes, from lightest to heaviest]
B) Element Name
C) Symbol
D) No Set Organization
123) Which of the following elements would be considered a compound?
A) CH [Yes, two or more elements combined]
B) Si [No]
C)F [No]
D) O6 [No, multiple atoms, but same element]
124) The formula for water is H2O meaning there are 2 Hydrogen atoms and 1
Oxygen. What is the atomic mass of one molecule to the nearest hundredth?
A) 15.99
B) 16.99
C) 17.99 [Yes, 16 + 2*1 = 18]
D) 18.99
How many chlorine molecules are in 6.5 moles of chlorine?
Answer:
the number of chlorine molecules in 6.5 moles of chlorine is calculated as follows
by use of Avogadro constant that is 1mole = 6.02 x10^23 molecules
what about 6.5 moles
6.5 x ( 6.02x 10^23)= 3.913 x10^24
(REALLLY NEED HELP) What takes extra electrical current from a wire or appliance and prevents it from going somewhere dangerous?
a ground
a resistor
a loopback
a current
Answer:
A resistor resists extra electric current.
Which of the following measurements
have four significant figures? Select all
that apply.
1.001
120.0
Explanation:Significant figures are used in science to determine the precision of a number. Depending on the decimal point, sig figs are counted in different ways.
Decimal Points
When counting sig figs, you always start at the first non-zero number. However, sometimes you start from the left, other times the right.
If the decimal point is present, start counting sig figs from the left.If the decimal point is absent, start counting sig figs from the right.Remember to start counting at the first non-zero number.
For people in the Americas, there is a trick to remembering this.
If this decimal is Present, start from the Pacific. If it is Absent, start from the Atlantic.This works because the Pacific ocean is to the left of the Americas, and the Atlantic is to the right.
4 Significant Figures
The number 1.001, has 4 significant figures. Since there is a decimal point, we start counting from the left. The first digit is not zero, so we count all four places as significant.
The number 120.0 also has 4 sig figs. Like the number above, we start counting from the left because of the decimal. The first digit on the left is not zero, so we once again count all 4 digits as significant.
A volume measured by a graduated cylinder that was marked in 100 mL
increments would be reported to the nearest __________mL
The volume measured using such a cylinder will be reported to the nearest 10th mL.
Cylinder graduation10 mL graduated cylinders are always read to the nearest two decimal places.
100 mL graduated cylinders are always read to the nearest 1 decimal place. The nearest 1 decimal place is the same thing as the nearest 10th.
Thus, a reading made using a 100mL increment graduated cylinder would be reported to the nearest 10th mL.
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a group of atoms of more than one elements forms
Considering the definition of chemical compounds, a group of atoms of more than one elements forms chemical compounds.
What is a chemical compoundChemical Compounds are substances that are made up of a minimum of 2 elements that have reacted with each other to give another substance different from the initial elements. Elements are held together by what is known as a chemical bond.
In other words, a chemical compound is any substance formed by the union of two or more types of chemical elements, that is, by atoms of two or more different types of chemical elements, joined together by chemical bonds in certain proportions.
A chemical compound can be separated into its constituent elements by chemical reactions.
SummaryIn summary, a group of atoms of more than one elements forms chemical compounds.
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Blood alcohol concentration (bac) is defined as the ration of alcohol in the system to?
Blood Alcohol Concentration (BAC) is defined as the ratio of alcohol in the system to Blood in the system.
Blood/Breath Alcohol concentration (BAC) is the quantity of alcohol within the bloodstream or on one's breath. BAC is expressed because of the weight of ethanol, in grams, in 100 milliliters of blood, or 210 liters of breath. BAC can be measured with the aid of breath, blood, or urine exams.
Blood alcohol content material shows the percentage of alcohol that is in a person's bloodstream. BAC is crucial to prosecutors because they accept it as true with it displays how tons an individual is impaired via alcohol.
Human beings making their own alcoholic beverages regularly calculate the percentage of alcohol by way of extent by way of measuring their relative density with a hydrometer or their sugar content material with a refractometer.
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Two trains, A and B are moving at a speed of 20 km per hour
and 30 km per hour respectively. Which type of energy do
these two trains have?
Answer:
[tex]\fbox {kinetic motion}[/tex]
Explanation:
As the trains are clearly in motion, we can understand the these trains possess kinetic energy, which is by virtue of a motion of a body.
Answer:
type of energy that two train have are kinetic energy
Which best describes the reducing agent in the reaction below? cl2(aq) 2br–(aq) right arrow. 2cl–(aq) br2(aq)
The [tex]Br^{-}[/tex] describes the reducing agent in the reaction below.
[tex]Cl_{2} (aq) + 2Br^{-} (aq)[/tex] → [tex]2Cl^{-}(aq) + Br_{2}( aq)[/tex]
Reducing agent is the species in which oxidation is takes place. Reducing agent is the species in which loss of electrons is takes place. In the above reaction bromine ion in left hand side of the reaction loss electron to become bromine atom. So, bromine ion is reducing agent.
Oxidizing agent is the species in which reduction is takes place. Oxidizing agent is the species in which gain of electrons is takes place. In the above reaction chlorine atom in right hand side of the reaction gain electron to become chlorine ion. So, chlorine atom is reducing agent.
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state and appearance sodium chloride
Sodium chloride is white, crystalline solid at room temperature.
Sodium chlorideIt is a compound whose components atoms are sodium and chlorine.
The atoms of the two elements combine chemically through an ionic bond. The sodium donates it valence electron to the chlorine atom.
Thus, sodium chloride is an ionic compound. It has a characteristic white appearance and crystalline structure.
The compound is a solid at room temperature. It has a melting point of 801 °C.
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which of these attacking reagent is an electrophile 1:HNO3 2:Nh3 3:Br- 4: H+
The attacking reagent which is an electrophile is H+; option D.
What are electrophiles?Electrophiles are electron-loving reagents which attack and attach to electron-rich reagents.
Electrophiles usually are positively charged reagents.
Therefore, the attacking reagent which is an electrophile is H+.
In conclusion, electrophiles are electron-loving reagents.
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how do protons determine the identity of an atom
Explanation:
Proton is one of the subatomic particles which has a positive charge. The number of protons present will give the atomic number of the chemical element. Every element will have a unique atomic number. Thus, we can say that protons will determine the identity of an element.
In Keq expressions, "[]" represents of reactants and products.
a)concentration
b)temperature
c)moles
d)mass
Answer: concentration
Explanation:
This is a fact.
Chemical A has a toxicity level of 1 and chemical B has a toxicity level of 2. If a mixture of the two chemicals has a toxicity level of 3, what can we say about the results of the mixture
If chemical A has a toxicity level of one and chemical B has a toxicity level of two and the mixture of these two chemicals has a toxicity level of three, it means that the mixture of these two chemicals form a synergistic mixture. This is condition is known as synergism.
A synergistic effect is exerted when a greater effect is exerted than the added effect of both the chemicals together. This is applicable for toxic chemicals as well as non-toxic chemicals. Synergism can be dangerous in the case of both toxicology or chemicals in general. The greater effect of toxic chemicals can result in a dangerous mixture, which could prove to have fatal effects in many cases. The opposite of synergistic effect is antagonistic effect. The antagonistic effect is the effect where the overall effect of these two chemicals would be less than the sum of the effects imparted by the individual chemicals.
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C6 h12o6 6o2 adp pi 6co2 6 h2o molecule a heat the molecule referred to as ""molecule a"" in the equation above is:_________
a. atp.
b. nadph.
c. nadh.
d. adp.
The "molecule a" referred to ATP in the equation.
So, option A is correct one.
The equation is given as,
[tex]C_{6} H_{12} O_{6}+ 6O_{2}[/tex] → [tex]6CO_{2}+ 6H_{2}O + ATP[/tex]
The above equation indicates the respiration activities in the plants.
The aerobic respiration takes place in the Mitochondria and which requires oxygen and glucose and produces carbon dioxide , water and energy.
The energy is in the form of ATP. The pull form of ATP is adenosine triphosphate. The ATP is also called energy carrier because it found in the cells of the all living organism and this molecule carries energy.
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What happens to iron in a bolt as the bolt rusts?
Answer:
write the following as fractions in their simplest form
Select the correct answer.
Given:
2AI + 6HCI-2AlCl3 + 3H2
If the chemical reaction produces 129 grams of AlCl3, how many grams of H₂ are also produced?
OA 1.22
OB. 2.92
OC. 3.02
OD. 3.65
Answer:
B.) 2.92
Explanation:
Tp find the mass of H₂ produced, you need to (1) convert grams AlCl₃ to moles AlCl₃ (via molar mass), then (2) convert moles AlCl₃ to moles H₂ (via mole-to-mole ratio from equation coefficients), and then (3) convert moles H₂ to grams H₂ (via molar mass). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units.
Molar Mass (AlCl₃): 26.982 g/mol + 3(35.453 g/mol)
Molar Mass (AlCl₃): 133.341 g/mol
2 Al + 6 HCl ---> 2 AlCl₃ + 3 H₂
Molar Mass (H₂): 2(1.008 g/mol)
Molar Mass (H₂): 2.016 g/mol
129 g AlCl₃ 1 mole 3 moles H₂ 2.016 g
------------------ x ------------------ x --------------------- x --------------- =
133.341 g 2 moles AlCl₃ 1 mole
= 2.93 g H₂
*our answers are most likely different due to using slightly different molar masses
At a particular temperature, the solubility of He in water is 0.080 M when the partial pressure is 1.7 atm. What partial pressure (in atm) of He would give a solubility of 0.200 M
At a particular temperature, the solubility of He in water is 0.080 M when the partial pressure is 1.7 atm. 4.25 atm is the partial pressure of He would give a solubility of 0.200 M.
What is Henry's Law ?Henry's Law is a gas law states that at a constant temperature the amount of gas that dissolved in a liquid is directly proportional to the partial pressure of that gas.
What is relationship between Henry's Law constant and Solubility ?The solubility of gas is directly proportional to partial pressure.
It is expressed as:
[tex]S_{\text{gas}} = K_{H} P_{\text{gas}}[/tex]
where,
[tex]S_{\text{gas}}[/tex] = Solubility of gas
[tex]K_{H}[/tex] = Henry's Law constant
[tex]P_{\text{gas}}[/tex] = Partial pressure of gas
Now put the values in above expression we get
[tex]S_{\text{gas}} = K_{H} P_{\text{gas}}[/tex]
0.080M = [tex]K_{H}[/tex] × 1.7 atm
[tex]K_{H} = \frac{0.080\ M}{1.7\ \text{atm}}[/tex]
= 0.047 M/atm
Now we have to find the partial pressure of He
[tex]S_{\text{gas}} = K_{H} P_{\text{gas}}[/tex]
0.200 M = 0.047 M/atm × [tex]P_{\text{gas}}[/tex]
[tex]P_{\text{gas}} = \frac{0.200 M}{0.047\ \text{M/atm}}[/tex]
= 4.25 atm
Thus from the above conclusion we can say that At a particular temperature, the solubility of He in water is 0.080 M when the partial pressure is 1.7 atm. 4.25 atm is the partial pressure of He would give a solubility of 0.200 M.
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About how long does it take for the reaction to reach equilibrium in this concentration versus time graph?
a graph of reactant and product concentration vs. time; a red curve shows the reactant concentration decreasing while two blue curves show the product concentration increasing with time; both blue curves intersect the red curve; the chemical equation is water reacting to produce hydrogen and oxygen
A.
0.5 second
B.
1.5 seconds
C.
2.5 seconds
D.
4.5 seconds
The time taken for the reaction to reach equilibrium in this concentration versus time graph is 4.5 seconds and is denoted as option D.
What is Time?This refers to the duration in which a certain action or activity takes place with its unit being seconds.
From the graph we can deduce that:
The two blue lines, the concentrations of H₂ and O₂, become flat between 4 and 5 seconds.The red line, the concentration of H₂O, becomes flat, also, between 4 and 5 seconds.This therefore means that the time taken for the reaction to reach equilibrium in this concentration versus time graph is 4.5 seconds.
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Answer: 4.5 is right just took the test.
Explanation:
Which answer best describes what is happening in the following reaction?
2C8H18 + 25O2 Right arrow. 16CO2 + 18H2O
This is not a redox reaction. It is an example of combustion.
This is a redox reaction in which octane (C8H18) is the reducing agent.
This is a redox reaction in which carbon dioxide (CO2) burns due to ignition.
This is not a redox reaction, because a solution of carbon dioxide and water results.
The statement that best describes what is happening in the following reaction is this is not a redox reaction, It is an example of combustion (option A).
What is a combustion reaction?A combustion reaction is a reaction wherein a substance is combined with oxygen, usually at high temperature, releasing heat.
According to this question, octane undergoes a combustion reaction to produce carbon dioxide and water as follows: 2C8H18 + 25O2 = 16CO2 + 18H2O
Therefore, the statement that best describes what is happening in the following reaction is this is not a redox reaction, It is an example of combustion.
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Answer:
A: This is not a redox reaction. It is an example of combustion.
Explanation:
When 30.0 g of carbon is heated with silicon dioxide, 28.2 g of carbon monoxide is produced. What is the percent yield of carbon monoxide for this reaction? SiO₂(s) + 3C(s) SiC(s) + 2CO(g)
Answer: 60.5%
Explanation:
When 30.0 g of carbon is heated with silicon dioxide, 28.2 g of carbon monoxide is produced. 60.5% is the percent yield of carbon monoxide for this reaction.
The % ratio of the theoretical yield to the actual yield is known as the percent yield. It is calculated as the theoretical yield times by 100% divided by the experimental yield. The percent yield equals 100% if the theoretical and actual yields are equal.
SiO₂(s) + 3C(s)→ SiC(s) + 2CO(g)
moles of carbon =30.0 / 12=2.5moles
3 moles of carbon give 1 moles of SiC
1 mole of carbon will give 1/3 moles of SiC
2.5 mole of carbon will give (1/3)×2.5 =0.83 moles of SiC
mass of SiC = 0.83× 40.09=33.27
percent yield = (actual yield/theoretical yield) x 100%
percent yield= (28.2 / 33.27)x 100%
percent yield = 60.5%
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The combination of sucrose, sucrase, and water produces sucrase, glucose, and fructose. Which component of the reaction is the substrate
Answer:
Sucrose to is the substrate of the reaction because is a simple sugar( disaccharide) which produce glucose and fructose in the presence of sucrase or when it is hydrolysed.
11.A student titrated a diprotic weak acid (H2A) with 0.100 M NaOH. The titration required 22.58 mL of NaOH solution to reach the equivalence point. How many moles of diprotic acid were present
Moles of diprotic acid present were:
A mole of diprotic acid contains 0.0023 moles [tex]H_{2}A[/tex].
Law of dilution:
Titrations are conducted using the law of dilution.
The number of moles of solute divided by the arrangement's volume in liters is known as molarity.
The number of moles per liter of solution is referred to as molarity. Additionally, we write it as M. Furthermore, we employ the following equation to determine molarity:
Molarity = moles of solute/liter of solution.
Calculation:
Moles of acid = moles of base
n = M/V
Moles of [tex]H_{2}A[/tex] = Moles of NaOH used
Therefore, 0.100 x 0.02258L = 0.0023 mol [tex]H_{2}A[/tex]
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What mass of oxygen gas (o2) should occupy a 25. 0 l container when the pressure is 665 torr and the temperature is 55. 0ºc?
The mass of oxygen gas is 26.0 g.
Given,
Volume (V) = 25.0 L
665
Pressure (P) = 665 torr =
760 atm = 0.875 atm
Temperature (T) = 55 C = (55+2730) K = 328 K
Now using the Ideal gas law, calculate the mole of oxygen gas (02)
PV = nRT
atm . L
0.875 atm x 25.0 L = n x 0.082-
X 328K
mole . K
n = 0.813 mole
Using the molar mass of Oz = 32.0 g/mole, Calculate the mass of Oz
mass = 0.813 mole x 32.0 mole
mass = 26.016 g
mass = 26.0 g
The answer is 26.0 g.
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Will give u brainliest!!!
part e
drop a single crystal of sodium acetate into the flask. observe the contents of the flask. what happens to the sodium acetate solution in the flask after you drop in the crystal?
Answer:
I dropped a crystal of sodium acetate into the solution it immediately became cloudy again, it became supersaturated.
Explanation:
I used this and scored 100% but if you copy and paste they will flag you for plagiarsm so make sure to rewrite it in your own words.
I dropped a crystal of sodium acetate into the solution it immediately became cloudy again, it became supersaturated.
What is Sodium acetate solution?Chemically known as CH3COONa, sodium acetate is a hygroscopic powder that is very water soluble. The addition of sodium acetate to products like heating pads, food, industries, and concrete is possible.
When administered intravenously, sodium acetate plays a critical role in medicine as an electrolyte replenisher. It is mostly recommended to treat hyponatremic patients' sodium levels. Additionally, it can be used to alkalinize urine and treat metabolic acidosis.
In patients with limited or no oral intake, salt should be added to high volumes of intravenous fluids to prevent or treat hyponatremia. for the patient's needs cannot be addressed by conventional electrolyte or nutrient solutions, it is also helpful as an addition for creating customized intravenous fluid formulas.
Therefore, I dropped a crystal of sodium acetate into the solution it immediately became cloudy again, it became supersaturated.
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Predict the mass (in grams) of precipitate that will form if a solution containing 2. 34 g of cesium hydroxide is added to a solution containing a large excess of tiso4?
The mass (in grams) of precipitate is 0.6386 gram.
Calculation,
To find the mass of precipitate, first we have to find the precipitate. So, the chemical reaction when cesium hydroxide react to large excess of [tex]TiSO_{4}[/tex].
Mole of cesium hydroxide = given mass/molar mass = 2.34 gm/ 149.912 g/mol= 0.0156 moles
[tex]2CsOH+TiSO_{4}[/tex]→[tex]Ti(OH)_{2} +Cs_{2} SO_{4}[/tex]
So, mole ratio 2: 1
It means two moles of cesium hydroxide required to form one mole of titanium hydroxide.
To produce 0.0156 moles of cesium hydroxide = 0.0156 moles×1 mole/2
Mole of titanium hydroxide = 0.0078 mole
Mole of titanium hydroxide = given mass/molar mass of titanium hydroxide
Mole of titanium hydroxide = given mass/81.82 g/mol = 0.0078 mole
Mass of titanium hydroxide = 0.0078 mole ×81.88 g/mol = 0.6387 gm
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