CHEMISTRY HIGH SCHOOL

Which element is most chemically similar to chlorine?
Ar
F
Fr
S

Answers

Answer 1
Answer: all halogens
 for this F is correct

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_____ is the time required for one-half of the atoms of a radioisotope to decay to products. a. fusion
b. radioactivity
c. half-life
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Answers

C half life..............................

Which gas occupies the highest volume at STP?0.02 mol of O20.1 mol of Cl21 mol of N22 mol of H2

Answers

The correct answer is the fourth option. The gas, 2 mol of H2, occupies the highest volume at STP since at STP the volume of this gas is approximately 44.8 mol as compared to other options this has the greatest amount. At STP, 1 mol of a gas is said to be equal to a volume of 22.4 L.

Describe the role of energy in chemical reactions.

Answers

Energy in a chemical reaction is not created nor destroyed, it's always conserved based on the law of conservation of energy. 

Density is a measure of mass divided by volume

weight divided by area

volume divided by weight

mass divided by area

Answers

Density is mass divided by volume.

At STP, which of these substances is most soluble in H2O?(1) CCl4 (3) HCl
(2) CO2 (4) N2

Answers

The correct answer is option 3. Hydrochloric acid is the most soluble in water at standard temperature and pressure because it is has a polar covalent bond which makes it a polar molecule. Water is also a polar substance therefore hydrochloric acid will really be soluble in water.

Answer: Option (3) is the correct answer.

Explanation:

It is known that like dissolves like that is, a polar solvent will dissolve only polar compounds. Whereas a non-polar solvent will dissolve only non-polar compound.

Substances whose atoms have large difference in electronegativities are polar in nature. Water is a polar solvent and it is able to dissolve polar molecules.  

For example, HCl is a polar or ionic compound so it is soluble in water.

On the other hand, CCl_(4), CO_(2), and N_(2) are all non-polar as bond between them is formed due to sharing of electrons.

Hence, we can conclude that at STP, HCl is the substance that is most soluble in H_(2)O.

Which is a cleaner source of energy? Fission or Fusion? Why?

Answers

In 1987, the World Commission on Environment and Development (WCED) classified fission reactors that produce more fissile nuclear fuel than they consume (breeder reactors, and if developed, fusion power) among conventional renewable energy sources, such as solar and falling water.
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