2.1: Properties of Substances

Substances change state when they are heated and ___________.

• frozen
• cooled
• evaporated
• condensed

What is a property of substance?

• Something about a substance that allows us to tell it apart from other substances

• An amount or a number of something

• A particular quality in your personality

• Something important, interesting or typical of a place or thing

What is the boiling point of water?

(a)  

• 50°C
• 200°C
• 100°C
• 150°C

What is the melting point of a substance?

• gas → liquid

• solid → gas

• solid → liquid

• liquid → gas

Organise these options into the right categories

Groups:

(a) Boiling

,

(b) Evaporation

• happens slowly

• can happen at any temperature

• unnatural process that needs continuous heating

• must reach the boiling point for it to happen

• natural process

• happens quickly

• no bubbles

• has bubbles

What is the "independent variable" of an experiment?

• What I change in an experiment

• What I see (observe) in an experiment

• What I keep the same in an experiment

What is inside soda (Coke/Sprite/Fanta) that causes the bubbles?

• carbon dioxide
• hydrogen
• nitrogen
• oxygen

What is one way to measure the mass (weight) of gas?

• Using a ruler and measure the length of gas

• Using a thermometer and measure the temperature of the air

• Using a stopwatch and time when the gas disappears

• Using a scale or balance and contain the gas in a container

The dependent variable in a fair experiment is ___________.

• What I change in an experiment

• What I keep the same in an experiment

• What I see (observe) in an experiment

In a fair experiment, what I keep the same is considered the _______ ______.

• dependent variable
• independent variable
• experimental variable
• controlled variable