Chemistry- Chemical Reactions

Question 1

Fill the gaps.
Nitric acid produces ____ salts.
______ acid produces sulphate salts.
Hydrophilic acid produces _____ salts.

Answer 1

1. Nitrate
2. Sulphuric
3. Chloride

Question 2

Fill on the gaps about the ph scale.
Anything above 7 is _____.
7 is ______.
Anything bellow 7 is _____.

Answer 2

1. An alkalis
2. Neutral
3. An acid

Question 3

What does dilute mean?

Answer 3

Make a liquid thinner or weaker by adding water or another solvent to it

Question 4

Concentrated meaning?

Answer 4

The measure of how much of a given substance there is mixed with another substance.

Question 5

Fill in the gaps.
Alkalis + acid = salt and water = ______
So when you add alkalis to acid it becomes _____, so it will become ______.

Answer 5

1. Neutral
2. Neutral
3. Green

Question 6

What’s oxidation reaction?

Answer 6

When a metal or non- metal reacts with oxygen.

Question 7

Fill the gaps.
In an exothermic reaction, heat is given out, it gets ____.
In an endothermic reaction, heat is taken in, then it gets ___.

Answer 7

1. Warmer

2. Colder

Question 8

What are the signs of a chemical reaction?

Answer 8

1. See huge flames or tiny sparks
2. Notice a sweet smell or foul stink
3. Feel the chemicals getting colder
4. Hear a loud bang or gentle fizzing
5. Convert carbon monoxide (which is toxic) into carbon dioxide

Question 9

What does a catalytic converter reduce?

Answer 9

The release of harmful gases from vehicles

Question 10

Fill in the gap

When something is irreversible it is a ____ reaction.

Answer 10

Chemical reaction