My Inquiry homework

Inquiry - Chemical Change

 define these words:

Substance

Reaction

Reversible 

Irreversible

Watch the video on ‘Kitchen Chemical Changes’ then answer the 3 questions on the next slide.

1. Substance 

A substance is a physical matter or a thing that you can  sometimes hold or see.

2.  REACTION

A reaction is the effect of when something happens.

3. REVERSIBLE

Reversible is when something is able to go back to its original state of form.

4.  IRREVERSIBLE

Not able to be transferred back to its original state or form. 

Change

1. What are 4 things that might happen when a substance undergoes chemical change? (1:27)

When a substance undergoes chemical change it might burn, melt, evapourate or change color.  

2. What are the 5 pieces of evidence that baking a cake is a chemical change? (2:15 - 3:15)

When the cake is heated it produces carbon dioxide in the form of gas which makes the cake fluffy. The cake turns from yellow to brown.the smell of the cake changes. The change cant be undone.

3. Can you think of another chemical change that happens in the kitchen? 

When salt and sugar meets contact with a form of liquide it dissolves hence making a chemical change.