Chemical Changes

Question 1

What is an acid?

Answer 1

An acid is a substance that upon dissolving in H2O, will dissociate to form H+ ions.

Question 2

What is an alkali?

Answer 2

An alkali is a base that is soluble in water. Once it dissolves in water, its will dissociate to form H+ ions.

Question 3

What is a base?

Answer 3

A base is a substance that is any metal oxide or hydroxide.

Question 4

What is the pH scale?

Answer 4

A scale measuring alkalinity and acidity, with values from 0 to 14. Alkalis have the highest values while acids have the lowest.

Question 5

What is an an indicator?

Answer 5

A chemical substance that changes colour in substances of different pH values.

Question 6

What are the different types of acid reactions?

Answer 6

1. Acid + base=salt and water(neutralisation)
2. Acid + metal = salt + hydrogen
3. Acid + carbonate = salt+water+co2

Question 7

What is the charge of sulfate?

Answer 7

2-

Question 8

What is the charge of oxide?

Answer 8

2-

Question 9

What is the charge of ammonia?

Answer 9

NH4
1+

Question 10

What is the charge of carbonate?

Answer 10

CO3
2-

Question 11

What is the charge of chloride?

Answer 11

-1

Question 12

What is the charge of sodium?

Answer 12

+1

Question 13

What is the charge of nitrate?

Answer 13

NO3
-1

Question 14

Are H+ ions acidic?

Answer 14

Yes