Science 4th grade | UNIT 3: Solids‚ liquids and gases 3.5 Melting in different solids booklet
Science 4th grade | UNIT 3: Solids‚ liquids and gases 3.5 Melting in different solids booklet
- UNIT 1: Humans and animals
- UNIT 2: Living things and environment
- UNIT 3: Solids‚ liquids and gases
- UNIT 4: Sound
- UNIT 5: Electricity and magnetism
- Reference
Activity 3.5 (Compare melting in different solids
You will need: an ice cube - a square of chocolate a cube of butter - three pans - three hot plates - a stop - watch or digital watch
Place an ice cube in a pan. Do the same with the chocolate and the butter.
Predict which substance you think will melt first when you heat it.
Start heating each substance at the same time. Record the time you start.
Observe carefully. Record the time taken for each substance to completely melt.
Safety: Be careful of the hot plate, it can burn you.
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Record your results in a bar chart.
Questions
1) Describe the phase change that each substance went through when you heated it.
2) How did you try to make this investigation a fair test?
3) In what ways was the investigation not a fair test?
4) What will happen to the water if you continue heating it?
Even metals like gold and iron will melt if they get hot enough. Metals have to be heated in a furnace to melt.
When the melted metal cools it becomes a solid again.
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Here are the phase changes the gold has passed through:
solid 
liquid 
solid