electricity and magnetism

Question 1

Are metal oxides acidic or alkaline?

Answer 1

Alkaline e.g. sodium hydroxide is a drain cleaner

Question 2

Are non-metal oxides acidic or alkaline? What happens when a compound combusts?

Answer 2

Acidic ,Each element in the compound forms an oxide

Question 3

Methane is a hydrocarbon (it contains carbon and hydrogen)what products form?

Answer 3

Water (oxidation of hydrogen) and carbon dioxide (oxidation of carbon)

Question 4

What is thermal decomposition?

Answer 4

A compound is broken down by heat

Question 5

What is a test for carbon dioxide?

Answer 5

limewater test

Question 6

What happens in displacement?

Answer 6

A more reactive metal takes the place of a less reactive metal in a compound

Question 7

Why are alkali metals (group 1 elements) reactive?

Answer 7

They have 1 electron in their outer shell

Question 8

Why are halogens (group 7 elements) reactive?

Answer 8

they have 7 electrons in the outer shell

Question 9

Why are nobel gases not reactive?

Answer 9

they have a full outer shell

Question 10

If a less reactive metal is added to a salt solution containing a more reactive metal what will happen?

Answer 10

no reaction

Question 11

What do all acids have in common? Complete the names of these common acids?

Answer 11

they contain hydrogen

Question 12

An acid releases what into solution?

Answer 12

hydrogen ions

Question 13

An alkalireleases what into solution?

Answer 13

hydroxide ions

Question 14

pH0 isastrong… pH 14 is a strong…

Answer 14

acid alkaline

Question 15

What is neutralisation?

Answer 15

The hydrogen ions from an acid combine with the hydroxide ions from an alkaline to form water

Question 16

Acid + alkali -> what are the products?
Acid + Metal carbonate -> what are the products?

Answer 16

salt +water
salt + water + carbon dioxide

Question 17

What is a salt?

Answer 17

Hydrogen ions from an acid have been replaced by a metal to form salt

Question 18

What is a catalyst?

Answer 18

Something that speeds up the chemical reaction without being used up

Question 19

Give an example of a biological catalyst ?
Catalysts the_ _ barrier which the rate of reaction

Answer 19

enzymes
Catalyst reduce the energy barrier which increases the rate of reaction

Question 20

Give 3 examples of diatomic elements (i.e they hang around in pairs!)

Answer 20

Oxygen, Nitrogen, Hydrogen or any other group 7

Question 21

True/False - all combustion reactions are oxidation reactions

Answer 21

true

Question 22

Where on the periodic table are many catalysts found?

Answer 22

Transition metals

Question 23

A material which easily allows an electric current is..

Answer 23

conductive

Question 24

A material which does not allow an electric current is…

Answer 24

an electrical insulator

Question 25

Name some good electrical conductors Name some good electrical insulators

Answer 25

Any metal (some are better than others!), graphite (a form of carbon), salt water Wood, plastic (most non-metals in fact)

Question 26

Draw the circuit symbol for a battery Draw the circuit symbol for a bulb

Answer 26

circle with cross

Question 27

Draw the circuit symbol for a switch Drawthe circuit symbol for a variable resistor

Answer 27

line

Question 28

Draw the circuit symbol for an ammeter What instrument is used to measure current?

Answer 28

circle with a an ammeter

Question 29

What does an ammeter measure?

Answer 29

the current

Question 30

What is the unit of current and what is its symbol?

Answer 30

amps, an A

Question 31

If 1 increase the number of cells in my battery the current will. ?

Answer 31

increase

Question 32

When the charge moves through the cell it gain.. .

Answer 32

energy

Question 33

Energy per unit charge is also known as. What is the unit of potential?

Answer 33

potential volts,V

Question 34

If 1 connect more bulbs in series with each other the resistance will..and the current will..

Answer 34

The resistance will increase in the current decrease

Question 35

What is the unit of resistance

Answer 35

ohms

Question 36

What is current?

Answer 36

the amount of charge passing a point each second

Question 37

At a junction in a circuit what is the important rule to remember?

Answer 37

Total current in equals total current out

Question 38

Which poles of a magnet attract each other?

Answer 38

the opposite poles

Question 39

What happens when like poles of magnets come together

Answer 39

they repel

Question 40

Give some examples of magnetic materials Give some examples of non-magnetic materials

Answer 40

Iron steel Cobalt Nickel plastic wood paper rubber glass

Question 41

Why does the Earth have a magnetic field What is a magnetic field?

Answer 41

because the centre of the earth of the earth is a rotating ball of iron. The region around a magnet where magnet materials experience force

Question 42

How are magnetic fields represented in diagrams?

Answer 42

using lines

Question 43

How could you visualise the field around a magnet?

Answer 43

iron filings or compasses

Question 44

Draw the magnetic field around a bar magnet

Answer 44

bar msg

Question 45

What is the shape of a magnetic field around a wire and how can we tell the direction of it?

Answer 45

it is circular and the thump up right hand rule

Question 46

When a current flows in a wire a magnetic field is generated. What do we call this effect?

Answer 46

Electromagnetism

Question 47

Draw the magnetic field around a coil/solenoid

Answer 47

same

Question 48

Name 3 ways to increase the strength of the magnetic field around a solenoid

Answer 48

Increase the current Increase the amount of coils add a soft iron core

Question 49

What is one of the major advantages of an electromagnet compared to a permanent magnet

Answer 49

Electromagnets can be switched on and off

Question 50

What is a relay circuit used for?

Answer 50

to activate high voltage circuits using low voltage circuits .This protects the user from high currents

Question 51

List some uses of electromagnets

Answer 51

x ray machines scrap yards