Frosh PhySci - Melting quiz

Question 0

F -

Explain why melting occurs

Answer 0

Particles absorb enough energy to overcome force of attraction. They can can move out of fixed positions and slip past one another forming a liquid.

Question 1

F -

The process in which a solid changes to a liquid is called ________.

Answer 1

Melting

Question 2

F -
Which of the following statements about melting is true?
a- Melting is a chemical change
b- Melting is a change of state
c- Melting changes the chemical properties of matter
d- Some substances do not melt no matter how hot they become

Answer 2

B- Melting is a change of state

Question 3

T/F Melted rock below Earth’s surface is know as lava

Answer 3

False It is magma

Question 4

What happens to melted rock on Earth’s surface?

Answer 4

It cools and hardens to form solid rock

Question 5

F -

The substance at which a substance melts is called its ____________.

Answer 5

Melting point

Question 6

F -

T/F The melting point of a substance is the same as its freezing point

Answer 6

True Just changes of state in either direction

Question 7

Which of these substances has the lowest melting point?  
a- iron
b- gold
c- water
d- oxygen

Answer 7

D- oxygen
Melting point = freezing point

Others are solids or liquid at room temp. Only oxygen is a gas

Question 8

Why are Earth’s glaciers melting? What are some effects of this change?

Answer 8

Global warming

Rising sea levels and warmer waters which is not best for ocean life

Question 9

What role does melting play in the formation of alloys?

Answer 9

Alloys = mixtures of metals

Most metals are solids at normal temps. To form alloys (mixtures), they must be melted.