Matter

Question 1

Match the terms below with their definitions.

gas
liquid
solid

Answer 1

gas - Physical state of indefinite shape and indefinite volume
liquid - Physical state of indefinite shape and definite volume
solid - Physical state of definite shape and definite volume

Question 2

In the term physical change, “physical” indicates that …

the composition of a substance changed !
the composition of a substance didn’t change
the substance can physically be lifted up
none of these options apply

Answer 2

the composition of a substance didn’t change

Question 3

In the term chemical change, “chemical” indicates that …
the composition of the substance changed
the composition of the substance didn’t change
the substance is hazardous
none of these options apply

Answer 3

the composition of the substance changed

Question 4

Classify each substance as either an element, compound, homogeneous mixture, or heterogeneous mixture.

a) carbon monoxide, CO
b) iodine, I2
c) pizza
d) pool water

Answer 4

a) carbon monoxide, CO - compound
b) iodine, I2 - element
c) pizza - heterogeneous mixture
d) pool water - homogeneous mixture

Question 5

Classify each change of matter as either a physical change or a chemical change.

a) breaking a rubber band

b) burning a match

c) evaporating rubbing alcohol

d) exploding a firecracker

Answer 5

a) breaking a rubber band - physical change

b) burning a match - physical change

c) evaporating rubbing alcohol - chemical change

d) exploding a firecracker - physical change

Question 6

The fact that sodium will react violently with water immediately upon exposure is a…

Answer 6

chemical change of sodium

Question 7

Heating solid tellurium in air below 1250 °C results in liquid tellurium. Classify this change of matter as either a physical change or a chemical change.

Answer 7

physical change