Question 18

Question

A reaction that produces heat is an endothermic reaction.

True
False
Question 19
According to Newton's second law, what happens when the same force is applied to two objects of different masses?

a
The object with greater mass will experience a smaller acceleration.
b
The two objects experience the same acceleration.
c
The object with greater mass will experience a greater acceleration.
d
The object with smaller mass will experience a smaller acceleration.
Question 20
A radioisotope has a half-life of 7.5 hours. How many half lives have occured after 67.5 hours?

a
7 half-lives
b
8 half-lives
c
9 half-lives
d
10 half-lives

Answer 1

Question 18
A reaction that produces heat is an endothermic reaction.
False
(A reaction that produces heat is an exothermic reaction.)

Question 19
According to Newton's second law, what happens when the same force is applied to two objects of different masses?
a The object with greater mass will experience a smaller acceleration.
(According to Newton's second law, \( F = ma \), if the same force is applied, the acceleration is inversely proportional to the mass.)

Question 20
A radioisotope has a half-life of 7.5 hours. How many half-lives have occurred after 67.5 hours?
b 8 half-lives
(67.5 hours divided by 7.5 hours equals 9 half-lives.)