Chapter 8 : Changes to materials

Question 1

What are physical properties?

Answer 1

The appearance, boiling point, melting point and state of matter of a substance.

Question 2

Name 3 physical properties of Magnesium.

Answer 2

Shiny, Strong, Solid

Question 3

What are chemical properties?

Answer 3

The pH level and the way a substance reacts with another substance.

Question 4

Name a chemical property of Magnesium

Answer 4

It reacts with oxygen.

Question 5

Write the chemical equation for how Magnesium reacts with hydrochloric acid

Answer 5

Magnesium + Hydrochloric acid = Magnesium Chloride + Hydrogen

Question 6

How do you test for hydrogen?

Answer 6

Place a lighted splint near the mouth of the tube containing the gas. If there is a pop and the flame goes out, it is hydrogen.

Question 7

How do you test for carbon dioxide using limewater?

Answer 7

Mix the limewater with the gas, it the gas turns cloudy then there is carbon dioxide.

Question 8

What type of reaction happens when an acid is mixed with an alkali?

Answer 8

Neutralisation

Question 9

When working with chemicals, what safety precautions must you take?

Answer 9

Wear safety goggles, remove all accessories that could come in contact with the substances, wear gloves, keep hair neat and tied up.