Practice Exam

Question 1

At what temperature is the substance a heated gas?

Revolt · Accepted Answer

B: above  100 times degree C

Question 2

Which substance is a binary acid?

Revolt · Accepted Answer

A: hydrochloric acid

Question 3

Which of these properties is the best one to use for identification of an element?

Revolt · Accepted Answer

B: the number of isotopes that are formed by the element; D: the number of protons in the atomic nucleus

Question 4

Which process is a chemical change?

Revolt · Accepted Answer

A: loss of atmospheric ozone; D: formation of frost

Question 5

Which statement describes a major drawback of the Bohr model that caused scientists to replace it?

Revolt · Accepted Answer

C: It contradicted the Heisenberg uncertainty principle.

Question 6

Which best describes the trends in electronegativity on the periodic table?

Revolt · Accepted Answer

A: Electronegativity decreases down and to the right.; C: Electronegativity increases up and to the right.

Question 7

Which of these could form an ionic bond with an anion?

Revolt · Accepted Answer

A: Ar; C: Hg sub 2 raised to the 2 plus power

Question 8

How many electrons can the n is equal to 4 shell hold?

Revolt · Accepted Answer

C: 8; D: 32

Question 9

Which statement about hydrogen bonds is true?

Revolt · Accepted Answer

A: They help water striders walk on water by creating surface tension.; D: They are the only force that allows a gecko to climb up glass.

Question 10

Which equation is a decomposition reaction?

Revolt · Accepted Answer

A: Zn plus HCl rightarrow ZnCl sub 2 plus cap h sub 2; C: Li sub 2 CO sub 3 rightarrow Li sub 2 cap o plus CO sub 2

Practice Exam Answers