Chemical Reactions And Equations

Question 1

What is a chemical reaction?

Answer 1

When a chemical change occurs, it is said that a chemical reaction has happened.

Question 2

Explain the reaction of burning of a magnesium ribbon.

Answer 2

1. Clean a magnesium ribbon with sand paper
2. Place it over the burner with tongs
3. It would burn with a white dazzling flame and produce a white powder

Question 3

Why should a magnesium ribbon be cleaned before burning it?

Answer 3

It should be cleaned to get rid of the buildup magnesium oxide on the ribbon from being left out in the open.

Question 4

We can say a chemical reaction has taken place when we observe:

Answer 4

1.Change in temp
2.Change in colour
3. Change in State
4. Evolution of gas