S3 Unit 1

Organise these options into the right categories

Groups:

(a) Increase rate of reaction

,

(b) Decrease rate of reaction

• Increasing temperature

• increase concentration

• Add a suitable catalyst

• Incerase particle size

• Decrease concnentration

• Decrease temperature

• Decrease particle size

The correct formula for sulfur dioxide is?

• SO

• S₂O

• SO₂

• SiO₂

Organize these options into the right categories

Groups:

(a) Sign of a chemical reaction

,

(b) Not a sign of a chemical reaction

• Boiling

• Bubbling

• Dissolving

• Melting

• Change of shape

• Precipitate

• Energy change

• Colour change

Identify the metal

• Carbon

• Calcium

• Silicon

• Iodine

Identify the property of a non metal

• Doesn't conduct electricty

• Melts at 1230 degrees celsius

• Good conductor of heat

• Can be molded into different shapes

Substance with the lowest melting point.

• Phosphorus 44 *C

• Bromine -7*C

• Sodium 98*C

• Rubidium 39*C

Substance with the highest melting point.

• Phosphorus 44 *C

• Bromine -7*C

• Sodium 98*C

• Rubidium 39*C

Substance that is most acidic

• Milk

• Drain cleaner

• Lemon

• Blood

Substance that has highest pH

• Stomach acid

• Drain cleaner

• Coffee

• Soap

What will happen to the pH of ammonia if it is diluted?

• No change

• Increase

• Decrease

• Soap