Chemical Changes Homework Week 3

 In your jotter write the DATE in the margin.
Now add a TITLE for your homework.
Your title should be the name of the Homework: Chemical Changes Homework Week 3

 

 Question 1.
 Examine the diagrams below.
 PictureAAA
a) In your jotter, write down a list of those pictures which show a chemical reaction occurring.
 

Question 2.

In each of the diagrams below a chemical reaction is occurring.

Examine the diagrams, and for each reaction and explain how you know a chemical reaction has taken place.

 a)
 
 b)
 c)
 d)
 e)
Question 3.
 Which of these is a chemical reaction?
 A  A lake freezes solid.
 B  Gravel, sand, and water are mixed
 C  A copper bar is rolled into a flat sheet
 D  Vinegar bubbles when baking soda is added.
Question 4.
 Which process is a physical change?
 A  Rusting iron
 B  Burning coal
 C  Melting ice
 D  Tarnishing silver
Question 5.
 A mixture of iron filings and sulfur can easily be separated by —
 A  using a magnet
 B  heating the mixture
 C  dropping the mixture into acid
 D  placing the mixture in water
Question 6.
 If you break a piece of glass, the shape of the glass changes, but the properties in the fragments remain the same. Which of the following has occurred?
 A  A physical change
 B  A temperature change
 C  A chemical change
 D  A state change

 

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