A chloride of rhenium contains 63.6% rhenium. the formula of this compound is Re2Cl3.
The chemical trirhenium nonachloride has the formula ReCl3, which is occasionally also written as Re3Cl9. It is a hygroscopic solid that is dark red in color and insoluble in common solvents. The substance is significant in the development of inorganic chemistry since it was the first cluster compound to have metal-metal links. [1] It serves as the raw ingredient for the production of various rhenium complexes. Rhenium is an atomic number 75 chemical element with the symbol Re. It is a heavy, third-row transition metal in group 7 of the periodic table that is silvery-gray in color. Rhenium is one of the rarest elements in the Earth's crust, with an estimated average concentration of 1 part per billion (ppb).
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Which of the following is the strongest type of interaction that occurs between the atoms within the circled areas of the two molecules represented above? A) Polar covalent bond B) Nonpolar covalent bond C) Hydrogen bond D) London dispersion forces
The strongest type of interaction that occurs between the atoms is hydrogen bond.(option c)
A hydrogen atom that is bound to a highly electronegative atom and another highly electronegative atom that is close by interact with one another to form hydrogen bonds, which are an unique kind of attractive intermolecular interactions. This process is known as hydrogen bonding.
As a result of hydrogen bonding, a hydrogen atom simultaneously forms a covalent bond with one electronegative atom and a hydrogen bond with the other. These are the prerequisites for hydrogen bonding:
1.A strongly electronegative atom connected to the hydrogen atom must be present in the molecule. The degree of polarization of the molecule increases with increasing electronegativity.
2.The electronegative atom should have a tiny size. The strength of the electrostatic attraction increases with decreasing size.
So, the hydrogen bonding is the strongest bond.
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Which of the following ions has the largest radius?
a. Na+
b. K+
c. CS+
d. Li+
The size of an ion is determined by its atomic radius, which is a measure of the size of the atom from which the ion is formed. The atomic radius of an atom is generally determined by the size of its electron cloud. The size of the electron cloud is influenced by the number of electrons and the energy levels they occupy.
Of the ions given, Li+ has the smallest atomic radius because it has the smallest number of electrons and the highest effective nuclear charge, which means that its electrons are held more closely to the nucleus. Na+, K+, and CS+ have larger atomic radii than Li+ because they have more electrons and lower effective nuclear charges, which means that their electrons are held more weakly by the nucleus.
Therefore, the answer is CS+ has the largest radius.
10. What would the new concentration be, in percentage, of 1.5 ml of a 10% solution that has been increased with normal saline to 3.0 ml
The 1.5 ml of a 10% solution that was made into a 3.0 ml solution by adding normal saline now has a new concentration of 5%.
The amount of material in a certain area is referred to as concentration in chemistry. Another definition states that concentration is the ratio of a solution's solute to its entire solution or solvent. Mass per unit volume is a common way to express concentration. However, moles or units of volume can also be used to express the solute concentration. Concentration could be per unit mass instead of volume. Concentration can be computed for any mixture, despite often being used with chemical solutions.
By mathematically dividing the mass, moles, or volume of the solute by the mass, moles, or volume of the solution, one may calculate the concentration (or, less commonly, the solvent).
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a sample of n2o gas has a density of 3.10 g/l at 298 k.what must be the pressure of the gas (in mmhg)?
To determine the pressure of a gas, we need to use the ideal gas law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
We can re-arrange the ideal gas law to solve for pressure:
P = (nRT) / V
We are given that the density of the gas is 3.10 g/L, which we can use to calculate the volume of the gas. Density is defined as mass/volume, so we can rearrange the equation to find volume:
V = mass/density
We know the density is 3.10 g/L, and the mass is n * molar mass of N2O.
Molar mass of N2O = (14.01 + 2 * 16.00) g/mol = 44.01 g/mol
The volume of the gas is:
V = mass / density = n * molar mass of N2O / 3.10 g/L
Now we have all the information needed to use the ideal gas law to determine the pressure of the gas.
We are given that the temperature of the gas is 298K.
We can use the ideal gas constant R = 0.0821 Latm/molK
Plugging in the known values:
P = (nRT) / V = (n * 0.0821 Latm/molK * 298K) / (n * molar mass of N2O / 3.10 g/L)
P = (0.0821 * 298) / (44.01 / 3.10) atm
To convert the pressure in atm to mmHg, we need to multiply the pressure by 760 (1 atm = 760 mmHg)
P = (0.0821 * 298) / (44.01 / 3.10) * 760 mmHg
The pressure of the N2O gas is approximately 739.07 mmHg at 298K and density of 3.10 g/L.
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Show all your work and make sure to label all the numbers with the correct units if you do, I will give you brainliest, 5 stars, and a thank you:
A: A sample of sulfuric acid has a mass of 15.0 g. How many molecules are in this sample?
B: How many moles of sulfuric acid are present in 45 g of this sample?
C: How much would a .750 mole sample of Ammonium sulfate weigh?
D: What is the mass percent of hydrogen in this sample?
Why do the fourth and fifth periods contain 18 elements rather than 8 as observed in the second and third periods?
The fourth and fifth periods contain 18 elements rather than 8 as observed in the second and third period because of the accommodation of 10 additional electrons in the 3d orbital.
The number of orbitals that can be accommodated by s subshell is one, p subshell is three, d subshell is five and f subshell is seven.
In the second and the third period, the 2s subshell is filled with two electrons, 2p subshell with six electrons .So, the second period contains eight elements. The sequence in third period is similar to that of second period with additional filling of 3s and 3p subshell.
In the fourth period, electrons are first filled in the 4s subshell, only after that they can be filled in the 3d subshell. So, fourth period contains 18 elements , which is due to the additional 10 electrons in 3d subshell. This is similar in the case of fifth period also.
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What process do orcas use oxygen for?
The process orcas uses the oxygen is from the blowholes. the blow holes are situated on the top of of the head and it uses oxygen from their.
The whales and the humans uses the lungs for the respiration or to get oxygen required for the breathing. the orcas uses the oxygen from the blow holes situated at the top of the head. The orcas lives under the water and when the orcas dive in the water they have ability to hold the breath for at the time . but this is not good for the health . it is be very stressful for the body.
Thus, the process do the orcas uses oxygen for the intake is the from the blow holes.
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9.0 mol al reacts with 6.0 mol O2 to form Al2O3. According to the reaction below: 4Al+3O2=2Al2O3. How many moles of Al2O3 form from 6.0 mol al?
The number of moles of the aluminum oxide that is produced is 4.5 moles.
What is the stoichiometry?We have to look at the stoichiometry of the reaction. In this case, we can see that there is a combination between the aluminum and the oxygen and then we have a product as have been shown in the equation that we have in the question.
From the equation, we know that;
4 moles of oxygen produces 2 moles of aluminum oxide
9 moles of oxygen produces x moles of aluminum oxide
x = 9 * 2/4
x = 4.5 moles
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Answer: its actually 4
Explanation:
I have 5mg of a powder chemical substance that I need to dissolve in a solvent with a 2g/L solubility. I ultimately need to give two doses of the chemical: 10ug/L and 100 ug/L. Ultimately, I must add between 5ul and 10ul of the stock solution. I can create up to 3 stock dilutions. How can I solve this problem? Please show all work so I can learn! Thank you.
We need to take 5ul of stock solution and add it to 5ul of diluent to achieve a final concentration of 100ug/L.
How calculate the stock solution?To solve this problem, you will need to create a stock solution of the chemical substance and then dilute it to the desired concentrations. Here's one way you could approach it:
Create a stock solution by dissolving the 5mg of powder in a solvent with a 2g/L solubility. We know that the solubility of the substance is 2g/L, so we can use the formula:
Stock solution concentration = (mass of substance) / (volume of solvent)
In this case, the mass of the substance is 5mg and the volume of solvent is 1L. So, the stock solution concentration is:
5mg / (1L) = 5mg/L
Dilute the stock solution to the desired concentration for the first dose of 10ug/L. To do this, we can use the formula:
Desired concentration = (volume of stock solution) / (volume of diluent)
In this case, we want a final concentration of 10ug/L, so we'll let the volume of stock solution be x and the volume of diluent be (5ul-x). Then we can set up the equation:
10ug/L = (x) / (5ul-x)
Solving this equation:
x = 0.5ul
Therefore, we need to take 0.5ul of stock solution and add it to 5ul of diluent to achieve a final concentration of 10ug/L
Dilute the stock solution to the desired concentration for the second dose of 100ug/L. Using the same formula as before:
Desired concentration = (volume of stock solution) / (volume of diluent)
In this case, we want a final concentration of 100ug/L, so we'll let the volume of stock solution be y and the volume of diluent be (10ul-y). Then we can set up the equation:
100ug/L = (y) / (10ul-y)
Solving this equation:
y = 5ul
Therefore, we need to take 5ul of stock solution and add it to 5ul of diluent to achieve a final concentration of 100ug/L
So, you can create a stock solution by dissolving 5mg of powder in a solvent with 2g/L solubility and obtain a stock solution of 5mg/L. With this stock solution, you can create two dilutions, the first one is 10ug/L by adding 0.5ul of stock solution to 5ul of diluent, and the second one is 100ug/L by adding 5ul of stock solution to 5ul of diluent.
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Please help. 100 points
Answer:
Term
Liquid C) takes the shape and volume of an entire container
Plasma A) charged particles that do not have a definite shape or volume
Solid B) has a fixed volume and shape
Gas D) assumes the shape of the part of the container from the bottom up
how could you use this pattern to predict how the element may behave in a chemical reaction
Answer:
it can predict the properties of new elements, because it organizes the elements according to their atomic numbers.
Creating new elements is not a simple process. Scientists use a particle accelerator to smash light atoms into a thin metallic foil that contains heavier atoms. They hope that the two nuclei at the centre of these atoms will fuse and form a heavier nucleus.
When these heavy elements form, they are usually highly unstable. They decay so quickly that we don’t usually see the element itself. Instead, we see a decay product. In that respect, even new elements aren't always 'discovered' directly. In some cases, scientists haven’t synthesized enough of the element for us to know what the element even looks like! Nevertheless, we consider the elements as known. We name them and list them the periodic table.
For example, in 2003, scientists first observed element 115 (ununpentium, Uup) They bombarded americium-243 with calcium-248 ions and produced four atoms of Uup, which lived for less than one fifth of a second.
₂₀ ⁴⁸Ca + ₉₅²⁴³Am → ₁₁₅²⁸⁸Uup + 3 ₀¹n
It took until September 2013 for the discovery to be confirmed, and about 50 atoms have been synthesized to date.
We can predict the properties of Uup because the Periodic Table organizes elements according to their atomic number.
Use the drawing to help explain why gas pressure decreases when gas is removed from acontainer with a fixed volume
When gas is removed from a container with a fixed volume, the number of gas particles decreases, so there are fewer collisions and thus less pressure.
Additionally, the remaining gas particles have more space to move around, which also leads to a decrease in pressure. This can be visualized in the drawing by the decrease in the number of gas particles and the increased distance between them as gas is removed from the container.
As the gas particles decrease, there are fewer particles to collide with the walls of the container and therefore less force is exerted on the walls. This results in a decrease in the pressure inside the container.
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Iodine Monochloride reacts reversibly with Chlorine to form Iodine Trichloride, What will be the color of the equilibrium mixture
Answer:
Yellow
Explanation:
The color of the equilibrium mixture of Iodine Monochloride and Chlorine is yellow. When the mixture is heated, it becomes darker brown in color.
Chlorine has an average atomic mass of 35.45 amu. The two natrually occuring isotopes of chlorine are chlorine-35 and chlorine-37. why does this indicate that most chlorine atoms contain 18 nuetrons?
Most chlorine atoms contain 18 neutrons as mole ratio of chlorine-35 and chlorine-37 is more than 1.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
let the moles of chlorine-35 is n1 and chlorine-37 is n2
now we will use the formula of average atomic mass
M=n₁M₁+n₂M₂/n₁+n₂
let say, n₁/n₂=x
substitution gives,35.45=x(35)+37/x+1 which on solving gives x=3.44
since mole ratio is more than 1, that's why most chlorine atoms have 18 neutrons.
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What are the correct formal charges for nitrogen atoms I, II, and III, respectively, in the azide below
Formal charge for nitrogen atoms I, II, and III, respectively in the azide provided is 0, +1, and -1
A formal charge, in the covalent chemical bonding, refers to the hypothetical charge assigned to an atom in a molecule, based on the assumption that electrons in all chemical bonds are shared equally between atoms, regardless of relative electronegativity. In other words, formal charge is defined as the difference between the number of valence electrons of an atom in a neutral free state and the number assigned to that atom in a Lewis structure. It is given as
Formal charges = Group variance – nonbonding electrons – ½ bonding electron
For the nitrogen atom I,
Formal charges =5 – 2 – ½ (6) = 0
For the nitrogen atom II,
Formal charges =5 – 0 – ½ (8) = 1
For the nitrogen atom III,
Formal charges =5 – 4 – ½ (4) = -1
Note: The question is incomplete as it is missing the figure which is attached.
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Consider the positions of barium (Ba), sulfur (S), silicon (Si), and calcium (Ca) on the periodic table. The atoms of which element require the least amount of energy to give up an electron when forming chemical bonds?
barium
sulfur
silicon
calcium
According to the electronic configuration and shielding effect along a group barium requires the least amount of energy to give up an electron when forming chemical bonds.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
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Answer:
A. Barium
Explanation:
The higher the metallic character, the less energy needed to give up an electron.
The metallic character is higher in the higher period numbers and in the lower group numbers. Out of all the elements listed, Barium would require the least amount of energy.
The solid xy decomposes into gaseous x and y: xy(s) m x(g) + y(g) kp = 4. 1 (at 0 °c) if the reaction is carried out in a 22. 4 l container, which initial amounts of x and y will result in the formation of solid xy?
The initial amounts of x and y required to form solid xy are 1 mol of x and 1 mol of y.
What is initial amount?The initial amount is the starting point for any financial transaction.
In order to calculate the initial amounts of x and y that will result in the formation of solid xy, the following equation must be used:
nx = ny * (4.1/kp)
where nx and ny are the moles of x and y, respectively, and kp is the equilibrium constant of the reaction.
Given the information provided, we can calculate the moles of x and y:
nx = ny * (4.1/4.1) = ny
ny = (22.4 L * 1 mol/22.4 L) = 1 mol
Therefore, nx = 1 mol and ny = 1 mol.
This means that if the reaction is carried out in a 22.4 L container, the initial amounts of x and y required to form solid xy are 1 mol of x and 1 mol of y.
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What is a neutral atom and has 14 protons?
A neutral atom and has 14 protons is Silicon
Each of the elements in the Periodic Table has an individual atomic number, or a specific number of protons in its nucleus.
The total number of protons that make up an atom's nucleus is represented by the atomic number of that atom, as is well known. We know that an atom has proton of 14, so the atomic number of that neutral atom is 14. we can check on the periodic table an atom that have 14 atomic number is silicon.
Therefore, the neutral atom and has 14 protons is Silicon
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Lead absorption is decreased by the presence of ______ in the body. a) calcium and vitamin D b) calcium and iron c) iron and selenium
Answer: Correct option is B . calcium and iron decrease the absorption of lead in the body.
Explanation: calcium and iron decrease the absorption of lead in the body without affecting its solubility,probably by competing for shared absorptive receptors in the intestinal mucosa. The total body burden of lead does not affect lead absorption. Thus, lead does not have a feedback mechanism which limits absorption.
Hydrochloric acid (HCl) is combined with cesium hydroxide (CsOH) in a neutralization reaction. Which ions will combine to form a salt
The ions will combine to form a salt are Cl- and Cs+ when Hydrochloric acid (HCl) is combined with cesium hydroxide (CsOH) in a neutralization reaction.
HCl + CsOH --> CsCl + H2O
Cesium chloride is the salt that results from the neutralization of hydrochloric acid with cesium hydroxide. Because both of the bonds in salt compounds the positively charged cesium ion and the negatively charged chloride ion have electrical charges, they are referred to as ionic bonds. A neutralization reaction occurs when an acid and a base combine to form salt and water in an aqueous solution. A salt is the name for the aqueous cesium chloride that is created during the process.
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how many carbon atoms are in 2.12 mol of propane. how many hydrogen atoms are in 2.12 mol of propane
There are 5,944 carbon atoms in 2.12 moles of propane, and 15,528 hydrogen atoms in 2.12 moles of propane.
What is carbon?
Carbon is an element that occurs in nature and is essential for life. It is the fourth most abundant element in the universe and is present in all living organisms. Carbon exists in many different forms, including graphite, diamond, amorphous carbon, and fullerenes. Carbon is a key component of organic molecules, which are the building blocks of life. Carbon also plays an important role in the global carbon cycle.
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A student dissolved 0.178 grams of a solid monoprotic acid in water and then titrated it. They then performed the same calculation as you just did in question 2 to find the moles and they found that 0.00685 moles were neutralized. What is the molar mass of the unknown acid that was dissolved? (Hint: What are the units for molar mass?)
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 25.98g/mol is the molar mass of the unknown acid that was dissolved.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
mole =given mass ÷ molar mass
Molar mass of unknown acid= ?
mass of unknown acid= 0.178 grams
moles of unknown acid= 0.00685 moles
Substituting the values in above formula we get
0.00685 = 0.178 ÷ molar mass
molar mass=25.98g/mol
Therefore, 25.98g/mol is the molar mass of the unknown acid that was dissolved.
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If we react 14 moles of oxygen with five moles of ethane how many moles of carbon dioxide would we make
Answer:46 moles of carbon dioxide and 12 moles of ethane.
Explanation:
46 moles of carbon dioxide and 12 moles of ethane.
What is Carbon dioxide?A non-flammable, colorless gas, carbon dioxide is. While being far less common in the atmosphere than nitrogen and oxygen, carbon dioxide plays a crucial influence in determining the composition of the air on our planet.
Carbon dioxide, a colourless gas having a faint sharp odour and a sour taste. It is one of the most important greenhouse gases linked to global warming, but it is a minor component of Earth’s atmosphere .
It is formed in combustion of carbon-containing materials, in fermentation, and in respiration of animals and employed by plants in the photosynthesis of carbohydrates.
Therefore, 46 moles of carbon dioxide and 12 moles of ethane.
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How can you tell which metal is more reactive?
The reactivity of metals depends upon their position in the periodic table and their nature of undergoing chemical reactions.
The primary difference between metals is the ease with which they undergo chemical reactions. The elements toward the bottom left corner of the periodic table are the metals that are the most active in the sense of being the most reactive. Such as alkali metals like Lithium, sodium, and potassium all react with water, thus they are reactive in nature than the metals belonging to alkaline earth metals. The nature of more reactivity of alkali metals is due to larger atomic radius and low ionization energies and they have only one valence electron in its outermost shell.
Thus, the reactivity of metals depends upon their position in the periodic table and their nature of undergoing chemical reactions.
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How does Angelica Hernandez work help others
Answer:Angelica currently works on energy efficiency programs for Nexant, Inc, an Arizona-based company focused on clean energy solutions.
Explanation:
A compound is found to contain 43.64 % phosphorus and 56.36 % oxygen by weight The molecular weight for this compound is 283.88 g/mol. What is the molecular formula for this compound
A compound is found to contain 43.64 % phosphorus and 56.36 % oxygen by weight The molecular weight for this compound is 283.88 g/mol. is the molecular formula for this compound is P₂O₅.
Given that :
mass of the oxygen = 56.36 %
molar mass of the oxygen = 16 g /mol
moles of the oxygen= mass / molar mass
= 56.36 / 16
= 3.52 mol
mass of the phosphorus = 43.64 %
molar mass of the phosphorus = 31 g/mol
moles of the phosphorus = 43.64 / 31
= 1.41 mol
dividing by the smallest one :
moles of the phosphorus = 1 = 2
moles of the oxygen = 2.5 = 5
The molecular formula is P₂O₅.
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1. isostasy subduction 2. deepest ocean depths fjord 3. drowned glaciated valley plate tectonics 4. theory of crustal structure trench 5. oceanic plate going down buoyancy
The isostasy is relates to the buoyancy , the deepest oceans depths relates to the trench, the theory of the crustal structure relates to the plate tectonics.
The match the following for the given options are given below as follows :
1 ) isostasy buoyancy
2) deepest ocean depths trench
3) drowned glaciated valley fjord
4) theory of crustal structure tectonic plates
5) oceanic plate going down subduction
The above are the correct order for the given following relations. these given options are related to the earth movement. like isostasy is the rising or the settling of the part of the earth's lithosphere.
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Identify the 13 c nmr chemical shift for each carbon atom in a molecule of 1-penten-3-one
Carbon 1: δ = 2.09 ppm (The C1 atom is a methyl group, and is in a tertiary environment, which typically corresponds to a chemical shift of around 2.09 ppm).
What is chemical shift?Chemical shift is a term used in NMR spectroscopy to describe the relative difference in the resonance frequency of a nucleus in a molecule compared to a reference frequency.
2. Carbon 2: δ = 11.81 ppm (This is the carbonyl carbon, and is in a sp2 hybridized environment, which typically corresponds to a chemical shift of around 11.81 ppm).
3. Carbon 3: δ = 13.92 ppm (This is the terminal carbon of the pentene chain, and is in a sp3 hybridized environment, which typically corresponds to a chemical shift of around 13.92 ppm).
4. Carbon 4: δ = 16.53 ppm (The C4 atom is a methylene group, and is in a secondary environment, which typically corresponds to a chemical shift of around 16.53 ppm).
5. Carbon 5: δ = 17.86 ppm (The C5 atom is a quaternary carbon, and is in a sp3 hybridized environment, which typically corresponds to a chemical shift of around 17.86 ppm).
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Which of the following ion has largest size?
A. F-
B. Cs+
C. Al+3
D. O-2
Answer:
The ion with the largest size is Cs+.
Explanation:
The size of an ion is determined by the number of electrons it contains and the arrangement of those electrons in its electron cloud. Ions with a larger number of electrons will generally have a larger size because their electron clouds will be more diffuse and occupy more space. Ions with a smaller number of electrons will have a smaller size because their electron clouds will be more compact.
In general, ions in the same group of the periodic table will have a similar number of valence electrons and will be similar in size. For example, the F- ion and the O-2 ion both belong to Group 17 and have 7 valence electrons, so they are expected to be similar in size. Similarly, the Cs+ and Al+3 ions both belong to Group 1 and have a single valence electron, so they are also expected to be similar in size.
However, the Cs+ ion is much larger than the Al+3 ion because it has a larger number of total electrons. Cs+ has 55 electrons, while Al+3 has only 13 electrons. The larger number of electrons in Cs+ results in a more diffuse electron cloud and a larger overall size. Therefore, among the ions listed, Cs+ has the largest size
Match each item with the correct statement below.
Column A
1. Fluorine, bromine, or iodine
2. An element found in Group 1 of the periodic table
3. Sodium or cesium:
4. An element found in Group 17:
5. Magnesium or barium:
6. An element found in Group 2:
An element found in Group 2
Column B
a. Alkali metal
b. Alkaline earth metal
c. Halogen
Answer:
Explanation:
Flourine, bromine or iodine --> HalogenAn element found in group 1 of the periodic table --> Alkali metalSodium or cesium --> Alkali metalAn element found in group 17 --> HalogenMagnesium or Barium --> Alkaline earth metalAn elment found in group 2 --> Alkaline earth metal