According to the vsepr theory, which shape represents the molecule, cf4?

Answers

Answer 1
VSEPR is an acronym which stands for Valence Shell Electron Pair Repulsion. The theory is most commonly used as basis for establishing the shapes of the substances. 

CF4, as can be seen, has only one carbon atom and four fluorine atoms. The most preferred shape of the chemical is therefore, tetrahedral. 

Related Questions

Calculate the mass of 2.60 mol of CH3OH(l)

Answers

2.6mol x 32g/mol = 83.2g

How many more h+ ions does a solution with a ph of 4 than a solution with a ph of 5?

Answers

Ph 4=100 ions
Ph5=10.0 or 1,000
Each Ph unit has 10 times as many hydrogen ions as the unit above it.

A 0.82 kg piece of wood floats in water but is found to sink in alcohol (sg=0.79), in which it has an apparent mass of 0.059 kg .

Answers

upthrust = loss in weight = 0.82 - 0.059 = 0.761 Kg
upthrust = weight of the displaced fluid = 0.79*Vg where Vg is the volume of the piece of wood

Therefore:
0.761 = 0.79 Vg
Vg = 0.96329 

Density of wood (sg of wood) = mass / volume
density of wood = 0.82 / 0.96329 = 0.85 

What must be done to carbon dioxide gas to change it to a solid

Answers

Cooling down of carbon dioxide must be done. The freezing point of carbon dioxide is 78.5°C, so in order to make it solid, you must cool it down to or under the freezing point.

The thing to be done to change carbon dioxide gas into a solid is to decrease the temperature till freezing point.

What is solid state?

The condition of matter in which materials are not fluid but maintain their boundaries without support, with atoms or molecules maintaining fixed places in relation to one another and unable to move freely.

For changing the gaseous state into the solid state, we have to increase the pressure of gas so that the molecules of gas come close to each other or by decreasing the temperature of gas so that toms get freeze to not move freely.

Hence, by decreasing the temperature to freezing point, carbon dioxide gas will change into a solid.

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What do the letters mean in the brackets in the chemical reaction equation and how to balance them.
NaCl(s) + F2(g)

Answers

It means the state of the reactants, so NaCl would be a solid and F2 is a gas.

Final answer:

The letters in brackets in a chemical equation represent the physical states of substances; balancing a chemical equation requires the same number of each type of atom on both sides.

Explanation:

The letters in brackets like (s), (l), (g), and (aq) in a chemical reaction equation represent the physical states of the substances involved. (s) stands for solid, (l) for liquid, (g) for gas, and (aq) for aqueous solution, which means the substance is dissolved in water. To balance a chemical equation, you need to ensure that the number of atoms of each element is the same on both sides of the equation. For example, to balance Na (s) + Cl2 (g) → NaCl (s), we need to recognize that Cl2 is diatomic, and therefore the equation should be balanced as 2Na (s) + Cl2(g) → 2NaCl (s) to have equal numbers of sodium and chlorine atoms on both sides.

Please Help :((
What is the resulting formula unit when strontium (Sr) and phosphorus (P) bond?

Answers

The resulting formula would be Sr3P2

Answer: The chemical formula of the compound is [tex]Sr_3P_2[/tex]

Explanation:

Strontium is the 38th element of the periodic table. The electronic configuration of this element is [tex][Kr]5s^2[/tex]

This element will loose 2 electrons to attain stable electronic configuration to attain +2 oxidation state.

Phosphorus is the 15th element of the periodic table. The electronic configuration of this element is [tex]1s^22s^22p^63s^22p^3[/tex]

This element requires 3 electron to attain stable electronic configuration to attain -3 oxidation state.

So, by criss-cross method, the oxidation state of the ions are exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

Hence, the chemical formula of the compound is [tex]Sr_3P_2[/tex]

In general, which properties are common to elements within a single group on the periodic table?

Answers

Almost all properties are common to elements within a single group on the periodic table. They react with water in the same way, they have the same number of valence electrons thereby having the same valency, the number of shells in the atom of the element increases by one as we move down the group. 

In general, they have the same chemical properties as chemical properties depend on the number of electrons in the valence shell i.e. the outermost shell in the atom of an element. 

an ice cube and a scoop of table salt are left outside on a warm, sunny day. Explain why the ice cube melts and the salt does not

Answers

the reason why is that salt is a solid while ice is a liquid solid



or something like that but don't forget to put that it is  a solid

Ice cube is a liquid and the salt is a solid. Solids don't melt unless it's ice

What is the relationship between the molecular mass and the molar mass of a substance?

Answers

The molecular mass and the molar mass of a substance are numerically equivalent but measured in different units: amu and g/mol, respectively. The molecular mass in amu of a single molecule of a substance is the same as the molar mass in g/mol of one mole of that substance. This relationship is crucial for stoichiometric calculations in chemistry.

The molecular mass of a substance is the sum of the masses of all the atoms in a single molecule of that substance, measured in atomic mass units (amu). On the other hand, the molar mass of a substance is the mass of one mole of that substance, measured in grams per mole (g/mol). These two quantities have a direct relationship: for a given substance, the numerical value of the molecular mass in amu is equal to the numerical value of the molar mass in g/mol.

For example, the molecular mass of water (H2O) is approximately 18 amu (2(1) for hydrogen + 16 for oxygen), which means its molar mass is also 18 g/mol. To calculate the number of moles of a substance from its mass, we can use the equation: moles of solute (n) = mass of the solute (m) divided by the molar mass of the solute (M).

Understanding the relationship between molecular mass and molar mass is essential for converting between mass and moles of a substance, which is a fundamental concept in chemistry when dealing with reactions and stoichiometry.

A theory that has been proven true repeatedly over time and never disproven is called ??

Answers

A theory that has been proven true repeatedly over time and never disproven is called a law

A compound consists of 4.50 g of nitrogen for every 7.71 g of oxygen and has the same empirical and molecular formula identify the compound

Answers

The compund of N2O3 has the same empirical and molecular formula when the compund consist of 4.5g of nitrogen for every 7.71 grams of oxygen.

Answer:

[tex]N_2O_{3}[/tex]

Explanation:

Hi, the empirical formula is the minimal expression of the molecule composition and doesn't always represent the molecule in the reality.

On the other hand the molecular formula is a multiple of the empirical and represents how the molecule is composed in reality.

In this case they are the same.

Now, nitrogen has an atomic weight of 14 g/mol and oxygen one of 16 g/mol:

[tex]n_{nitrogen}=\frac{4.5g}{14g/mol}[/tex]

[tex]n_{nitrogen}= 0.321mol[/tex]

[tex]n_{oxygen}=\frac{7.715g}{16g/mol}[/tex]

[tex]n_{oxygen}= 0.482mol[/tex]

So the formula would be:

[tex]N_{0.321}O_{0.482}[/tex]

Dividing per 0.321:

[tex]NO_{1.5}[/tex]

In natural numbers:

[tex]N_2O_{3}[/tex]

Which could make up a solution?

Check all that apply.

A. A gas in a liquid
B. Two gases
C. Two solids
D. A solid in a liquid

Answers

its C. Two solids
 I'm pretty sure its c because then you have to melt the solid

What was Johann Dobereiner's contribution to the development of the periodic table?

Answers

He identified triads of elements that had similar properties.

Which subatomic particle did james chadwick discover? compare its mass to that of a proton. presi?

Answers

The subatomic particle James Chadwick discover is no other than NEUTRON. Neutron is a subatomic particle discovered by James Chadwick, its symbol n or n0 and it has no net electric charge. When we compare its mass to that of proton, the neutrons mass is slightly greater than the proton. 

Human activities can accelerate the process of

A) physical weathering
B) chemical weathering
C) both

Answers

I believe the answer is C) both

Hope this helps
Final answer:

Human activities can indeed accelerate the process of both physical and chemical weathering. Option C) is the correct answer.

Explanation:

Physical weathering involves the degradation of rock through physical processes, such as freeze-thaw cycles or abrasion. Chemical weathering, on the other hand, involves the decomposition of rock through chemical reactions, such as oxidation and hydration.

Human activities, such as deforestation, mining, and construction, can accelerate these processes. For instance, the removal of trees (deforestation) can lead to more intense freeze-thaw cycles, accelerating physical weathering. Mining, meanwhile, exposes more rock to air and water, facilitating chemical reactions and thus speeding up chemical weathering.

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The element chlorine is represented by the symbol ____. (Capitalization is important.)

Answers

he element chlorine is represented by the symbol Cl. 

The chemical symbol of the chlorine element is represented Cl.

What is the chemical element?

A chemical element can be described as a species of atoms that have a given number of protons in their nuclei which includes a pure substance consisting only of that species.

The chemical elements cannot be further broken down into simpler substances, unlike chemical compounds, by any chemical reaction.  The defining property of an element is the number of protons in the nucleus which is referred to as its atomic number.

Nearly all naturally occurring chemical elements occur on the Earth as compounds or mixtures. Air is primarily a mixture of nitrogen, oxygen, and argon, though it does contain compounds like carbon dioxide and water. A chemical symbol can bed described as a one- or two-letter designation of an element that has the first letter always capitalized.

The elements are organized in tabular form by increasing atomic numbers into rows called "periods" and into columns called "groups" that share physical and chemical properties. The modern periodic table summarizes various properties of the elements and the relationships between them.

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When two atoms collide, what determines whether they will react by transferring electrons or by sharing electrons?

Answers

If it is an ionic bond (metal with nonmetal) the electrons will be transferred. If it is a covalent bond (nonmetal with nonmetal) the electrons will be shared. It depends on the electronegativities; the closer the electronegativities of the two atoms, the more covalent the bond is, making the electrons more equally shared. But if the electronegativities are very different, one atom (the nonmetal) will pull the electrons from the other (the metal).

Answer:

Explanation:

The covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule. Covalent bonds are established between non-metallic elements, such as hydrogen H, oxygen O and chlorine Cl. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas.

An ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion.

So, a way to determine the type of bond will be knowing if the atoms are metallic or non-metallic.

The balanced equation for combustion in an acetylene torch is shown below: 2C2H2 + 5O2 → 4CO2 + 2H2O The acetylene tank contains 35.0 mol C2H2, and the oxygen tank contains 84.0 mol O2. How many moles of CO2 are produced when 35.0 mol C2H2 react completely?

Answers

Final answer:

When 35.0 mol of C2H2 react completely according to the given equation, 70.0 mol of CO2 will be produced.

Explanation:

The student asked about the amount of CO2 produced when 35.0 mol C2H2 reacts completely, according to the balanced chemical equation provided for the combustion of acetylene (C2H2) in an acetylene torch: 2C2H2 + 5O2 → 4CO2 + 2H2O.

To find the amount of CO2 produced, we apply stoichiometry using the balanced equation. According to the equation, 2 moles of C2H2 produce 4 moles of CO2. Therefore, if 35.0 mol C2H2 react completely, the amount of CO2 produced can be calculated by setting up a ratio:

(35.0 mol C2H2) × (4 mol CO2 / 2 mol C2H2) = 70.0 mol CO2

Thus, 35.0 mol of C2H2 will produce 70.0 mol of CO2 when they react completely.

When preparing a buret for use in lab the buret must always be cleaned thoroughly prior to being filled with solution what is burette rinsed with?

Answers

it is rinsed with ionised water to remove any impurities that may be present

Could you separate a mixture of salicylic acid and aspirin by acid-base extraction? briefly justify your answer.

Answers

Both the salicylic acid and the aspirin contains the carboxylic acid groups. Yes, the mixture of salicylic acid and aspirin can be separated by using the acid-based extraction. To dissolve the aspirin you need to use NaOH and it can isolate the aqueous layer.

A mixture of helium, neon and argon gases have a total pressure of 790 mmhg. if there is 118.5 mmhg of argon, 474 mmhg of helium, what is the partial pressure of the neon gas?

Answers

The total pressure of a mix of gasses in a certain volume equals the total of the partial pressures of the individual gasses added together. Algebraically. Total(790) = argon(118.5) + helium(474) + neon(unknown) neon = Total - argon - helium neon = 790 - 474 - 118.5 neon = 197.5 mmhg

I don’t understand this, can you help me?

Answers

An atom becomes stable if it has a full and complete ring. 2 of the choices are wrong off the start because you can't gain electrons and have a net positive charge, nor can you lose electrons and have a net negative charge. That leaves us with Option A or D. As I said earlier, an atom becomes stable if it has a full and complete ring. Obviously, if you lose 3 electrons from the last ring, the atom would be stable (because the 2nd ring is now full), and it also would have a net positive charge because it lost electrons.

What happens to the 6 carbon atoms of glucose when it is completely degraded?

Answers

Degradation means that a large molecule is broken down into simpler ones. In this case, glucose which has a chemical formula of C6H12O6 is broken down into simple parts.

Assuming that the reaction takes the form below, glucose is usually converted into 6 units of carbon dioxide CO2.

C6H12O6  + reactant  -->  6CO2  + product

Final answer:

When glucose is completely degraded, its six carbon atoms combine with oxygen to form carbon dioxide during cellular respiration. The energy from glucose's chemical bonds is stored in energy-carrier molecules.

Explanation:

When glucose is completely degraded, all six carbon atoms combine with oxygen to form carbon dioxide. The process of glucose degradation occurs during cellular respiration, specifically through the Krebs Cycle. After two turns of the cycle, the original glucose molecule has been broken down completely, and the energy from its chemical bonds has been stored in energy-carrier molecules. In total, 16 energy-carrier molecules are produced.

What is the formula for sodium sulfate?
a. na(so)
b. naso
c. naso
d. na(so)?

Answers

The formula for sodium sulfate is na(so)

To what chemical reaction class does this reaction belong? 2 mg(s) + o2(g)2 mgo(s)

Answers

Redox! Electrons are donated from one element to another

Why might the amount of copper produced be less than 100% of the expected amount? Check all possible reasons.

There are impurities in the substances.

The reaction might not go to completion.

The amount of one of the reactants might be measured incorrectly.

The molar ratio may not be correct.

The expected amount might be based on measurements with error.

Answers

the first one the third one and the fifth one hope this helped

Answer:

The answers are options 1, 2, 3, and 5.

Explanation:

Hello!

Let's solve this!

When an experiment is carried out and less product is obtained, it may be because:

There are impurities in the substances.

The reaction might not go to completion.

The amount of one of the reactants might be measured incorrectly.

The expected amount might be based on measurements with error.

We conclude that the answers are options 1, 2, 3, and 5.

Magnified we see that the carbon atom _______ in place. flashcard

Answers

Magnified we see that the carbon atom VIBRATE in place.
When microscope is used to view the carbon atom at the atomic level, it was discovered that the atom vibrate in place. Each individual atom is spherical and have fuzzed edges.

I REALLY NEED HELP

Question 1 (1 point) Question 1 Unsaved

Orbitals are defined by which of the following?
Question 1 options:

number of electrons

spin direction

energy level

composition
Save
Question 2 (1 point) Question 2 Unsaved

An atom has 14 protons and 14 neutrons. What is the chemical symbol for the atom? Consult the periodic table.
Question 2 options:

Al

Cr

Mg

Si
Save
Question 3 (1 point) Question 3 Unsaved

An atom has an average atomic mass of about 63.5 amu. What is the chemical symbol for the atom? Consult the periodic table.
Question 3 options:

Pb

Cu

Eu

Fe
Save
Question 4 (1 point) Question 4 Unsaved

An atom has a charge of –3 in its orbitals. Which statement must be true in order for this atom to have no net charge?

Question 4 options:

There are three neutral neutrons in the nucleus.

There are three positively charged protons in the nucleus.

There are two positively charged protons in the nucleus and one in an orbital.

There are three positively charged protons outside the nucleus.
Save
Question 5 (1 point) Question 5 Unsaved

The number of protons in the nucleus of an atom is equivalent to which of the following?
Question 5 options:

mass number

atomic weight

atomic number

number of neutrons
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Question 6 (1 point) Question 6 Unsaved

You heat two substances, A and B. Both substances change color. When cooled, substance A returns to its original color, but substance B does not. What most likely happened?
Question 6 options:

A chemical change occurred in both substances.

A chemical change occurred in substance A, and a physical change occurred in substance B.

A physical change occurred in both substances.

A physical change occurred in substance A, and a chemical change occurred in substance B.
Save
Question 7 (1 point) Question 7 Unsaved

A material has a density of 8.9 g/cm3. You have six cubic centimeters of the substance. What is the material's mass in grams?

Question 7 options:

5.9 g


107 g


3.0 g


53 g

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Question 8 (1 point) Question 8 Unsaved

Which of the following describes an element?
Question 8 options:

C2H6


H2O2


CuSO4


CI2

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Question 9 (1 point) Question 9 Unsaved

Which of the following goes on the x-axis of a graph?

Question 9 options:

trend line

independent variable values


graph title

dependent variable values
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Question 10 (1 point) Question 10 Unsaved

A container has the dimensions of 30 cm x 50 mm x 0.2 m. The density of its contents is 2.5 g/cm 3. What is the mass of the substance in kilograms? ( D = m/V)
Question 10 options:

150 kg

75 kg

0.75 kg

7.5 kg
Save

Answers

1. number of electrons
2.Si
3.Cu
4.There are three positively charged proton in the nucleus
5.mass number
6. A physical substance occur in A and a chemical change occur in B
7.53
8. dont know what you talking about.sorry
9. Independent variable
10.7.5g
This is an answer I can come up with.

What is the chemical equation for the vaporization of methanol?

Answers

The chemical equation for the vaporization of methanol is CH3OH (l) -> CH3OH (g). In vaporization, the substance merely changes state, from a liquid to a gas. Its constituent parts remain the same.

What is the name of a list of elements arranged according to the ease with which they undergo certain chemical reactions?

Answers

Reactivity series , I think

An activity series is the list that ranks elements based on their chemical reactivity, with good reducing agents like alkali metals on top, and good oxidizing agents like halogens at the bottom. The periodic table also organizes elements by their properties but in a different format, where elements with similar properties are grouped into families.

The name of the list of elements arranged according to the ease with which they undergo chemical reactions is called an activity series. An activity series is a list of elements ordered not by their atomic mass or number, but by their chemical reactivity.

This list typically presents elements in decreasing order of their reactivity. Elements at the top of the list, such as the alkali metals, are known to be good reducing agents, which means they lose electrons easily. Conversely, elements at the bottom, such as the halogens, are good oxidizing agents, meaning they tend to gain electrons.

Periodic Table and Element Families

While the periodic table organizes elements by increasing atomic number and groups elements with similar properties together in columns, it is different from an activity series. For instance, elements within the same family like the alkali metals (Group 1) or alkaline earth metals (Group 2) have similar chemical properties.

The periodic table's design allows chemists and scientists to infer the chemical behavior of elements, and it was constructed by Mendeleev, who grouped elements with similar properties together, sometimes even adjusting the order of atomic masses.

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