Melting or dissolving?

Melting or dissolving?

Pencil and paperOnline interactive
Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Further Resources
This task is about the difference between melting and dissolving.

Question 1Change answer

a)  Select whether the things below are examples of melting or dissolving.
 
     i)  Heating butter to make muffins.  meltingdissolving (select one)

     ii)  Making up a fruit drink from powdered juice.  meltingdissolving (select one)

     iii)  Using boiling water to make up jelly from jelly crystals.  meltingdissolving (select one)

Question 1Change answer

b)  Give another example of
     i)  melting
         
 
     ii)  dissolving 
          

Question 1Change answer

c)  Explain what happens when something melts.

Question 1Change answer

d)  Explain what happens when something dissolves.
Task administration: 
This task can be completed with pencil and paper or online (with some auto-marking).
Level:
3
Curriculum info: 
Science, Knowledge, Material World
Keywords: 
changes, dissolving, melting, vocabulary
Description of task: 
Task: Decide whether described situations are examples of melting or dissolving, provide further examples, and describe what happens when something melts, and when something dissolves. Assessment focus: definitions of melting and dissolving.
Curriculum Links: 
Knowledge:
Students need to understand the science of melting and dissolving.
Making Better Sense: 
Melting/Dissolving
Answers/responses: 
     

Y6 (12/1997)
a) i)
ii)
iii)		 Melting.
Dissolving.
Dissolving.		 very easy
very easy
easy
b) i)
ii)		 Any reasonable example of melting.
Any reasonable example of dissolving.		 difficult
difficult
c) Melting – any responses which shows an understanding that a solid changes into a liquid. moderate
d) Dissolving – any response which shows an understanding that it involves mixing a solid into a liquid. difficult