8.4

Question 1

What are five features of acids?

Answer 1

Acids:

• Sour tasting
• Tend to react with metals
• Have at least one H^+ ion
• Burning sensation on contact with skin
• Acids have a low pH

Question 2

What are 3 examples of strong acids?

Answer 2

• Hydrochloric acid
• Sulfuric acid
• Nitric acid

Question 3

What is an example of a weak acid?

Answer 3

• Ethanoic acid

Question 4

What are five features of bases?

Answer 4

Bases:
- Chemical opposite of acids
- Bitter taste
- Feel slippery to touch
- pH of higher than 7
- Bases that dissolve in water = alkalis
Solutions formed by these soluble bases (alkalis) = alkaline solutions

Question 5

What is an example of a strong and weak base?

Answer 5

(strong) Sodium Hydroxide, (weak) Ammonia

Question 6

What is the scientific formula for:

• Hydrochloric acid
• Sulfuric acid
• Nitric acid

Answer 6

Scientific formulas:

• HCl
• H₂SO₄
• HNO₃

Question 7

What is the scientific formula for:

- Sodium Hydroxide

Answer 7

Scientific formula:

NaOH

Question 8

What is called when acid and bases react?

Answer 8

Neutralisation.

They produce water and a salt

Question 9

What is the equation for acid and metal?

Answer 9

Acid + metal -> hydrogen + salt

Question 10

What is the equation for acid and base?

Answer 10

Acid + base -> water + salt

Question 11

What is the equation for acid and metal carbonate?

Answer 11

Acid + metal carbonate -> carbon dioxide + water + salt

Question 12

What is an advantage or acid metal reaction?

Answer 12

Used for jewllery

Question 13

What is an disadvantage or acid metal reaction?

Answer 13

Acid rain

Question 14

How does acid rain occur?

Answer 14

As rainwater falls, it can dissolve CO2 from the atmosphere

Question 15

What does acid rain do?

Answer 15

It can corrode building materials, marble and limestone.