Question

What happens to the metal lid of a jar when it is placed under hot water?
Responses
A The lid loses mass, becoming easier to open.The lid loses mass, becoming easier to open.
B The lid becomes tighter, causing a more secure seal. The lid becomes tighter, causing a more secure seal.
C The lid expands and may become easier to remove.The lid expands and may become easier to remove.
D The lid contracts and becomes harder to remove.The lid contracts and becomes harder to remove.

Answer 1

C

Heating the metal lid causes thermal expansion: the metal expands slightly (increasing diameter), so it loosens its grip on the glass threads and usually becomes easier to remove.