Chemistry Quiz 2 Essay Example

Question 1
0 out of 2 points

When electricity is passed through molten potassium bromide, two simpler substances, potassium and bromine, are produced. Therefore, potassium bromide

Selected Answer: has less mass than the resulting potassium and bromine do.
Correct Answer: cannot be an element.

Question 2
2 out of 2 points

Which of the following parts (postulates) of Dalton's atomic theory has been modified in light of later discoveries?

Selected Answer: Atoms are indivisible.
Correct Answer: Atoms are indivisible.

Question 3
2 out of 2 points

Nitrogen forms a number of different compounds with oxygen, depending upon the experimental conditions. This type of observation concerning the behavior of matter is summarized by

Selected Answer: the law of multiple proportions.
Correct Answer: the law of multiple proportions.

Question 4
2 out of 2 points

Which one of the following does NOT occur in a chemical reaction?

Selected Answer: Atoms are changed into other atoms.
Correct Answer: Atoms are changed into other atoms.

Question 5
0 out of 2 points

By definition, which of the following can be broken down into simpler substances?

Selected Answer: element
Correct Answer: compound

Question 6
0 out of 2 points

Which one of the following is NOT part of Dalton's atomic theory?

Selected Answer: Atoms of different elements have different properties.
Correct Answer: Atoms change into other atoms in chemical reactions.

Question 7
2 out of 2 points

Lavoisier measured the mass of substances before and after chemical reactions and summarized his observations in a(n)

Selected Answer: law.
Correct Answer: law.

Question 8
2 out of 2 points

The ability to recycle aluminum (or glass, or plastic) is ultimately an illustration of