7th grade states of matter

Question 1

Nitrogen melts at −210 °C and boils at −196 °C. What state is it in at −203 °C?

• A. solid
• B. liquid
• C. gas

Question 2

Aluminium (aluminum) melts at 660 °C and boils at 2470 °C. Over how many degrees is it a liquid?

Answer °C

Question 3

Which of these substances is a liquid at room temperature (20 °C)? copper: melts 1085 °C, boils 2562 °C sulfur: melts 115 °C, boils 445 °C ethanol: melts −114 °C, boils 78 °C iron: melts 1538 °C, boils 2862 °C

• A. iron
• B. sulfur
• C. ethanol
• D. copper

Question 4

A cube has sides of 5 cm and a density of 0.7 g/cm³. What is its mass, in g?

Answer g

Question 5

A block has a mass of 39.5 g and a volume of 5 cm³. What is its density, in g/cm³?

Answer g/cm³

Question 6

The density of steel is 7.8 g/cm³. Water's density is 1.0 g/cm³. Does a solid piece of steel float or sink in water?

• A. floats
• B. sinks

Question 7

Mercury melts at −39 °C and boils at 357 °C. What state is it in at 159 °C?

• A. solid
• B. liquid
• C. gas

Question 8

Bromine melts at −7 °C and boils at 59 °C. Over how many degrees is it a liquid?

Answer °C

Question 9

Which of these substances is a liquid at room temperature (20 °C)? oxygen: melts −218 °C, boils −183 °C mercury: melts −39 °C, boils 357 °C iron: melts 1538 °C, boils 2862 °C sulfur: melts 115 °C, boils 445 °C

• A. oxygen
• B. mercury
• C. sulfur
• D. iron

Question 10

A cube has sides of 2 cm and a density of 0.7 g/cm³. What is its mass, in g?

Answer g

Question 11

A block has a mass of 5 g and a volume of 2 cm³. What is its density, in g/cm³?

Answer g/cm³

Question 12

The density of glass is 2.5 g/cm³. Water's density is 1.0 g/cm³. Does a solid piece of glass float or sink in water?

• A. floats
• B. sinks

Question 13

Copper melts at 1085 °C and boils at 2562 °C. What state is it in at 1824 °C?

• A. solid
• B. liquid
• C. gas

Question 14

Bromine melts at −7 °C and boils at 59 °C. Over how many degrees is it a liquid?

Answer °C

Question 15

Which of these substances is a liquid at room temperature (20 °C)? copper: melts 1085 °C, boils 2562 °C nitrogen: melts −210 °C, boils −196 °C bromine: melts −7 °C, boils 59 °C aluminium (aluminum): melts 660 °C, boils 2470 °C

• A. bromine
• B. nitrogen
• C. aluminium (aluminum)
• D. copper

Question 16

A cube has sides of 4 cm and a density of 0.7 g/cm³. What is its mass, in g?

Answer g