States of Matter

Question 1

What is it known as if a solid heats into a gas?

Answer 1

Sublimation

Question 2

Why is there a horizontal line when showing the temperature of cooling/ heated substances?

Answer 2

The horizontal line shows the substance changing state

Question 3

When a liquid becomes a gas

Answer 3

Evaporation/ boiling

Question 4

Substance A melts at -20°C, and boils at -5°C. What state is it in at room temperature?

Answer 4

Gas

Question 5

When a gas cools into a solid.

Answer 5

Deposition

Question 6

What is the difference between evaporation and boiling?

Answer 6

Boiling requires a liquid to be heated into a gas. Evaporation means that the particles from the surface become vapour, which can happen at any temperature.

Question 7

Freezing is when…

Answer 7

A liquid becomes a solid.

Question 8

Substance B has a boiling point above 2000°C and a melting point at 1540°C. Is it a liquid at room temperature?

Answer 8

No - it is a solid

Question 9

Fill the blanks:
The amount of ______ needed to change state from a solid to a ______ and from a liquid to a gas depends on the ________ of the ______________ forces between the particles of the substance.

Answer 9

Energy
Liquid
Strength
Intermolecular

Question 10

When a liquid becomes a gas, it is known as…

Answer 10

Condensation

Question 11

What is substance C at room temperature if its melting point is at 100°C and its boiling point is at 245°C?

Answer 11

Solid

Question 12

Melting is when a…

Answer 12

Solid is heated to become a liquid

Question 13

Fill the blanks:

The ________ the ______________ forces between the particles, the ______ the _______ & _______ points are.

Answer 13

Stronger
Intermolecular
Higher
Melting & boiling