Topic 2

Question 1

Our stomach produces hydrochloric acid. What are the uses of the acid in our stomach?

Answer 1

• Kill bacteria in our food

- Help digestion by allow some enzymes to work better in acidic conditions

Question 2

How do antacids neutralize excess stomach acids

Answer 2

Antacids contain bases. Bases react with aids and neutralise them. Some bases are soluble. A base dissolved in water is called an Alkali.
Acid + base -> Salt + Water

Question 3

What are the three types of compounds that can be used to neutralise acids

Answer 3

• Metal oxides
• Metal hydroxides
• Metal cabonates

Question 4

What is the test for Chlorine?

Answer 4

Hold a piece of damp blue litmus paper litmus paper in the mouth of the test tube. If chlorine is present the litmus paper will go red and then become white

Question 5

What is oxidation?

Answer 5

An element has become oxidised when it has gained oxygen

Question 6

What is reduction?

Answer 6

An element that has lost its oxygen has been reduced.

e.g Aluminium Oxide -> Aluminium + Oxygen

Question 7

What are some advantages of recycling metals

Answer 7

• Earth’s metal supply will last longer
• Fewer mines (Problems with mines)
• Less pollution
• Less land is needed
• Less energy

Question 8

Describe one use of nitinol

Answer 8

It is used to keep arteries open. It is cooled and squished, when placed inside the body, the body heat makes it expand which holds the arteries open