Topic Test

Question 1

Rare fraction

Answer 1

When the wave is spread out

Question 2

Compression

Answer 2

When the wave is close together.

Question 3

What are waves?

Answer 3

Waves are vibrations that move. They transfer energy from one place to another.

Question 4

Waves are either…?

Answer 4

Transverse or longitudinal.

Question 5

Crest

Answer 5

Top of the wave

Question 6

Trough

Answer 6

Bottom of the wave

Question 7

Wavelength in a transverse

Answer 7

Trough to trough or crest to crest

Question 8

Wavelength in a longitudinal

Answer 8

Compression to compression or rare fraction to rare fraction.

Question 9

Which type of wave has the vibrations perpendicular to the direction of the wave?

Answer 9

Transverse

Question 10

Which type of wave has he vibrations parallel to the direction of the wave?

Answer 10

Longitudinal

Question 11

Frequency

Answer 11

The number of waves passing a point very second (the shorter the wavelength the higher frequency)

Question 12

Wave speed =

Answer 12

Frequency x wavelength

V= f x w

Question 13

What is speed measured in?
What is frequency measured in?
What is wave length measured in?

Answer 13

Speed = m/s
Frequency = Hz
Wavelength = m

Question 14

What is the formula of time period?

Answer 14

Time period = 1/ frequency

1 (top of triangle)
F (left)
T (right)

Question 15

What increases as the frequency increases?

Answer 15

Wave speed

Question 16

What is oxidation?

Answer 16

The gain of oxygen to a substance.

Question 17

What is reduction?

Answer 17

The removal of oxygen from a compound using carbon or hydrogen.

Question 18

Most reactive and least reactive?

Answer 18

Potassium = most 
Gold = least (jewellery)

Question 19

What is a displacement reaction?

Answer 19

A more reactive metal will displace a less reactive metal in a compound.

Question 20

What happened when acid reacts with most metals?

Answer 20

Salt is produced.

Question 21

What does the strength of an acid depend on?

Answer 21

H+ ions

Question 22

What happens with strong acid in water?

Answer 22

They fully dissociate in water (high concentration of h+)

Question 23

What happens with weak acids in water?

Answer 23

Only partly dissociate (low concentration of h+)

Question 24

What is neutralisation?

Answer 24

A reaction where aha acid and alkali react to produce a neutral solution (salt + water)

Question 25

To make salt?

Answer 25

Pour 20cm3 of acid. Pour acid into beaker and add alkali (zinc carbonate) in excess. Filter paper leaves large chunks of alkali veins. Bunsen burner starts evaporation process and leave it in crystal dish to evaporate and leave salt.