Year 9 - Reactivity etc

Question 1

What is made when metals react with other substances ?

Answer 1

Positive ions

Question 2

What is the reactivity of metals related to its tendency to … ?

Answer 2

Form positive ions

Question 3

How can metals be arranged in order of the reactivity ?

Answer 3

The reactivity series

Question 4

How are metals arranged in the reactivity series ?

Answer 4

potassium, sodium, lithium, calcium, magnesium, aluminium, carbon, zinc, iron , hydrogen and copper

Question 5

Which non metals are included in the reactivity series ?

Answer 5

Hydrogen and carbon

Question 6

What can displace a less reactive metal from a compound ?

Answer 6

A more reactive metal

Question 7

What is reacted with metals to make metal oxides ?

Answer 7

Oxygen

Question 8

What is the reaction of oxygen called ?

Answer 8

Oxidisation

Question 9

Explain oxidisation in terms of oxygen

Answer 9

It is the gain of oxygen

Question 10

Explain reduction in terms of oxygen

Answer 10

It’s the loss of oxygen

Question 11

What is corrosion ?

Answer 11

It is the destruction of materials by chemical reactions with substances in the environment.

Question 12

What is needed for rusting ?

Answer 12

Iron, water, oxygen

Question 13

What is rusting ?

Answer 13

An example of corrosion

Question 14

How can corrosion be prevented ?

Answer 14

It’s applying a coating that acts as a barrier, such as greasing, galvanising, painting or electroplating.

Question 15

What does aluminium have that prevents the metal from further corrosion ?

Answer 15

An oxide coating

Question 16

What is used to provide a sacrificial protection ?

Answer 16

A more reactive metal eg. zinc is used to galvanise iron

Question 17

What type of metals are found in the earth as the metal itself ?

Answer 17

Unreactive metals like gold

Question 18

What do you need to do to most metals ?

Answer 18

require chemical reactions to extract the metals

Question 19

How can metals less reactive than carbon be extracted ?

Answer 19

reduction with carbon

Question 20

Are the earths metal ores limited or not ?

Answer 20

They are limited

Question 21

What are new ways of extracting copper from low grade ores ?

Answer 21

Phytomining and bio leaching

Question 22

How does phytoming work ?

Answer 22

The plants are harvested and then burned to produce ash that contains metal compounds.

Question 23

Explain sacrificial protection in terms of relative reactivity

Answer 23

You would coat a less reactive metal with a more reactive metal to protect the metal underneath

Question 24

What is bioleaching ?

Answer 24

It uses bacteria to produce leachate solutions that contain metal compounds

Question 25

What is an independent variable ?

Answer 25

It is the one that is changed or selected by the investigator

Question 26

What is a dependent variable ?

Answer 26

It is measured for each change in the independent variable

Question 27

What are control variables?

Answer 27

They are kept the same

Question 28

Why are control variables kept the same?

Answer 28

To make the test fair

Question 29

How do you find a mean average?

Answer 29

You add all the numbers together, and then, divide by how many numbers there are

Question 30

What is an accurate measurement?

Answer 30

It’s one that is close to the true value

Question 31

What are precise measurements?

Answer 31

This is if they cluster closely

Question 32

What are repeatable measurements?

Answer 32

When repeated under the same conditions, the same investigator gives similar results

Question 33

What are reproducible measurements ?

Answer 33

Its similar results obtained by different investigators with different equipment

Question 34

What is systematic error?

Answer 34

It’s due to measurements results different from the true value by consistent amount each time

Question 35

What would you do with anomalous results ?

Answer 35

They should be ignored

Question 36

Why are measurements affected by random error?

Answer 36

Because due to the results, bearing in unpredictable ways, these areas can be reduced by making more measurements and reporting a mean value