Fast Five

1. Name the 3 main states of matter 2. Define evaporation3. Define condensation4. When a solid dissolves into liquid we call it a

s___________.5. At what temperature does water freeze?

Fast Five answers

1. Name the 3 main states of matter = Solid, liquid and gas2. Define evaporation = Evaporation is the process of

changing a liquid into a gas.3. Define condensation =Condensation is the process of

changing a gas into a liquid.4. When a solid dissolves into liquid we call it a solution5. At what temperature does water freeze? 0 degrees

celsius

Can I explain melting and freezing as changes of

state?

Freezing and Melting

There are three states of matter: solid, liquid and gas.

We have seen that sometimes substances change their state depending on the temperature.

Watch this videohttps://www.youtube.com/watch?v=ExbCpriId6c

There will be a short quiz afterwards !

Quiz

1. What are the three states of matter?

2. In Science, what does melting mean?

a) It means a solid is turning into a liquidb) It means a liquid is turning into a solidc) It means it’s too hot

3. In Science, what does freezing mean?

a)It means a solid is turning into a liquidb)It means a liquid is turning into a solidc) It means it’s too hot

Quiz Answers1. What are the three states of matter? Solid, Liquid and Gas2. In Science, what does melting mean?a) It means a solid is turning into a liquidb) It means a liquid is turning into a solidc) It means it’s too hot

3. In Science, what does freezing mean?

a)It means a solid is turning into a liquid

b)It means a liquid is turning into a solid

c) It means it’s too hot

Quiz

4) What does the melting point mean ?

5) What does the freezing point mean?

6) At what temperature does water freeze?

Quiz

4) What does the melting point mean ? It is the temperature where a solid becomes a liquid.

5) What does the freezing point mean?It is the temperature where a liquid becomes a solid.

6) At what temperature does water freeze?0 C

ExamplesChocolate has a melting point of 35 °C (degrees celsius).

Different substances have different melting points.

Metals

Copper is a metal. Its melting point is much higher than chocolate. It melts at 2562 °C.

IronIron has a lower melting point than Copper. It melts at 1535.1 °C.

Chlorine

Chlorine is a chemical that keeps swimming pools clean. It freezes at -101.5 °C.

Different substances have different freezing points.

Chocolate

Chocolate has a freezing point of 12°C: higher than water.

Water

We know that fresh water freezes at 0°C, sea water freezes at -2°C.