Frosh PhySci Freezing Quiz Flashcards
0
Q
F -
What causes a liquid to freeze?
A
A liquid loses energy so it becomes a solid (frozen)
1
Q
F -
What is freezing?
A
A liquid turning to a solid
2
Q
F -
The temperature at which a substance freezes is called its __________.
A
Freezing point
3
Q
F -
The freezing point of pure water is ________ degrees Celsius.
A
0 degrees
4
Q
Which of these substances has the highest freezing point? a- lead b- helium c- oxygen d- nitrogen
A
b- helium
5
Q
Which of these substances has a lower freezing point than pure water? a- salt water b- carbon c- sodium d- iron
A
a- salt water
6
Q
F -
T/F A liquid freezes when its particles lose energy
A
True
7
Q
Room temperature is considered to be 20 degrees Celsius. Give an original example of a substance with a freezing point lower than 20C.
A
Nitrogen
8
Q
F -
T/F Freezing point is a chemical property of matter
A
False No change of form. Only state
9
Q
Explain why road crews put salt on icy roads
A
Because is lowers the freezing point so that melted snow will not form ice on the roads.
