valerie'E-portfolio

 Part A

Materials that are needed:
-sugar
-a spoon
-a candle
-butter
-candle wax
-a spoonful of flour
-a beaker of water
-a beaker half-filled with vinegar
-a teaspoon of baking soda

What i and my friends did?
1.heating sugar,butter and candle wax.
2.cooling the sugar,butter and candle wax after it was heated.
3.Observe if there was a new material formed.
4.Identify if it is a physical or a chemical change.
5.Identify if it is a reversible change or a non-reversible change.
6.Fill in the table in the science workbook page 49.(Observations and results).


What i and my friends did?
1.add a spoonful of flour into the beaker of water and observe what happened.
2.add a teaspoon of baking soda into the beaker half-filled with vinegar.
3.fill in the table in the science workbook page 50(Observations and results).
4.fill in the conclusion part on page 50 too.

What is a reversible change?
-When materials go through a reversible change,they can be changed back to their original form.

What is a non-reversible change?
-When materials go through a non-reversible change,they cannot be changed back into their original form.Chemical changes are usually non-reversible.


http://www.youtube.com/watch?v=bm5UktYcybk Changes around us!
http://www.youtube.com/watch?v=Z-lGJ82Blt0 Reversible and non-reversible change video!

Here are some pictures when i and my friends do the science experiment!