Physical Change

Question 1

A _______ change is a change of matter in which some properties (shape, size, color, volume etc) of the material change, but the chemical identity of the matter does not.

Answer 1

physical

Question 2

Some physical changes involve chemical reactions.

Answer 2

false

Question 3

7 g of table salt is kept in water in a dish and the dish is heated until all the water evaporates. Assuming no chemical reactions occurred, what mass of salt should be left in the dish?

Answer 3

7g

Question 4

When a liquids gain enough energy they become gases. What is the general term for this process?

Answer 4

vaporization

Question 5

Which of the following is an irreversible physical change?

Answer 5

sharpening a pencil

Question 6

Conversion of gaseous nitrogen to liquid nitrogen is an example of a chemical change.

Answer 6

false

Question 7

A physical change is a change to a sample of matter in which some properties of the material change and the identity of the matter also change.

Answer 7

false

Question 8

When a liquid changes into solid, this is considered to be a chemical change.

Answer 8

false

Question 9

Ellias is hungry for popcorn. He grabs a bag from the cabinet and places it in the microwave. Once it has stopped popping he opens the bag and finds lots of popped popcorn for him to enjoy.

What type of change occurs as popcorn is cooked?

Answer 9

physical change

Question 10

When nails, screws, and bolts are prepared from a piece of iron, the composition of iron will change.

Answer 10

false

Question 11

When zinc is immersed in hydrocholoric acid, it produces hydrogen gas. This is a physical change.

Answer 11

false

Question 12

_____ solid to liquid

Answer 12

melting

Question 13

The physical change from liquid to solid is known as what?

Answer 13

freezing

Question 14

The physical change in melting an ice is reversible.

Answer 14

true