Year 9 Science Chapter 5-6

Sodium + oxygen -> X

what is x ?

• Sodium oxide

• Sodium hydroxide + hydrogen

• sodium dioxide

• Sodium oxide + hydrogen

waves will ..... when they meet with the peaks and troughs together.

• cancel

• reinforce

Lithuim + water -> lithium hydroxide + .....

• hydrogen

• carbon dioxide

• water vapour

• oxygen

what is this phenomenon called?

• reinforce

• cancel

• constructive

• destructive

(Reaction of Magnesium with steam)

Magnesium + water (g) ->

• Magnesium

  oxide + hydrogen

• Magnesium

  hydroxide + hydrogen

• Magnesium

  oxide

Waves will ......... when they meet with peaks together and with the throughs together.

• reinforce

• cancel

Which metals are completely inert to water?

• silver, gold, platinum

• silver, copper, zinc

• calcium, gold, platinum

• copper,iron,lead

Which letter represents the amplitude of the wave?

• a

• b

• c

• d

How do you test for hydrogen gas?

• use a lit splint

• use a universal indicator

• use a glowing splint

• use an iodine solution

What is the unit for the pitch of sound?

• dB

• Hz