Question 17

Question

A reaction that produces heat is an endothermic reaction.

True
False
Question 18
An atom of an element can change into an atom of another element if it is:

a
extremely stable
b
radioactive and it's nucleus can trap or emit particles
c
an ion and it's atomic number is larger than it's mass number
d
an isotope and it has more electrons than neutrons
Question 19
Atoms and molecules are constantly in motion. The more kinetic energy atoms or molecules have, the faster they move about. In which state of matter do the atoms and molecules have the least kinetic energy?

a
liquid
b
solid
c
gas
d
not enough information to determine

Answer 1

Question 17
A reaction that produces heat is an endothermic reaction.

Answer: False
(A reaction that produces heat is an exothermic reaction.)

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Question 18
An atom of an element can change into an atom of another element if it is:

Answer: b
(radioactive and its nucleus can trap or emit particles)

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Question 19
Atoms and molecules are constantly in motion. The more kinetic energy atoms or molecules have, the faster they move about. In which state of matter do the atoms and molecules have the least kinetic energy?

Answer: b
(solid)
(Solids have the least kinetic energy compared to liquids and gases.)