CHEMISTRY HIGH SCHOOL

Which of the following is the smallest volume? (2 points) 2500 mL 250 cm3
2.5 x 10-2 L
25 m3

Answers

Answer 1
Answer: So to put them all in the same units we have 
2500 mL 
250 mL 
25mL 
2,500,000,000mL 

So the third one is the smallest
Answer 2
Answer: The third is the answer becuase you multiply

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Which occurs when two fluorine atoms react to produce a fluorine molecule? (1) Energy is absorbed as a bond is broken. (2) Energy is absorbed as a bond is formed. (3) Energy is released as a bond is broken. (4) Energy is released as a bond is formed.

Answers

When two fluorine atoms react to produce a fluorine molecule, Energy is released as a bond is formed. The answer is number 4. IT takes energy to form a bond from two atoms that is why energy is releases after the bond is formed.

Hydrogen bonding occurs in molecules when a _____________. (1 point)hydrogen atom forms a covalent bond with one other atom.
hydrogen atom forms covalent bonds with more than one atom.
hydrogen atom of a polarized molecule bonds with an electronegative atom
hydrogen atoms form an ionic bond with one other atom

Answers

Answer: hydrogen atom of a polarized molecule bonds with an electro negative atom.

Explanation:

Hydrogen bonds are special type of dipole dipole forces which are formed when hydrogen bonds with an electro negative element. Hydrogen bonds are strongest type of bonds .Example: Bond between Oxygen of one water molecule to the hydrogen of another water molecule as shown in the image below.

Covalent bonds are formed by sharing of electrons among non metals.

Ionic bond is formed by transfer of electrons between metals and non metals.

Answer:

No because hydrogen can only form these bonds with highly electronegative atoms.

Explanation:

When a substance freezes, what happens to the mass? The mass stays constant as it changes from a liquid to a solid.

The mass increases as it changes from a liquid to a solid.

The mass decreases as it changes from a liquid to a solid.

There is no mass once the substance becomes a solid

Answers

The correct answer is the first statement. The mass stays constant as it changes from a liquid to a solid. According to the Law of Conservation of Mass, mass is conserved. It is not created nor destroyed. Therefore, as the substance turn into solid, all of the substance goes only to the solid phase.
The mass stays constant as it changes from a liquid to a solid

A researcher is using a particle accelerator in an experiment studying isotopes. How can the researcher change one isotope into a different isotope of the same element?by removing valence electrons

by adding valence electrons

by adding or removing protons

by adding or removing neutrons

Answers

The researcher can change one isotope into a different isotope of the same element by adding or removing neutrons. This is because, isotopes are two or more forms of an element which contain equal number of protons and electrons but different number of neutrons. Isotopes differ in relative atomic mass but have same chemical properties.

Answer: by adding or removing neutrons

Explanation:

What can happen when a fission chain reaction gets out of control? This can cause a loss of heat. This can cause an explosion. This can cause extreme cooling of radioactive waste. This can cause a rapid decrease in pressure. This can cause neutrons to combine to form new atoms.

Answers

When a fission chain reaction gets out of control this can cause an explosion. Typically, fission chain reactions are regulated by control rods in a nuclear reactor. However, in cases of accidents, these chain reactions release high energies very quickly. This leads to explosions and other life-threatening incidents.

In other words, the answer should be

b. This can cause an explosion.

posting this for future users to see!

Which of the following is not an example of an extensive physical property?A.) Mass
B.) Shape
C.) Color
D.) Volume

Answers

The correct answer is C. Color is not an extensive property because it does not depends on the amount. An extensive property is a property that is dependent on the amount of substance being measured. The opposite is called intensive property where it does not depend on the amount.
. . .. . . . .. . . . . .. . . . . . 
The correct answer is C.
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Convert to grams0.100 moles of Co2