Metals conduct electricity and heat and non-metals do not.

Elements

An element is a substance made from the same type of atom.

A periodic table shows all the elements known to exist.

Elements can be either metals or non-metals.

Elements are arranged in rows called periods and columns called groups.

The periodic table has 8 groups:•Group 1 = Alkali Metals•Between Groups 2 & 3 = Transition Metals•Group 7 = Halogens•Group 0 = Noble gases

Alkali metals are very reactive and have to be stored in oil e.g. Potassium, Sodium and Lithium.

The Halogens are also very reactive e.g. Chlorine and Fluorine.

Noble gases are unreactive.

Carbon is the only non-metal to conduct electricity.

The basic pieces of science equipment we use are:•Bunsen burner•Tripod•Gauze mat•Heat mat•Beaker•Test tube

•Boiling tube•Test tube holders•Conical flask•Test tube rack•Evaporating dish•Filter funnel

Metals can be both malleable and ductile.

Malleable means the metal can be shaped easily e.g. into a candlestick holder.

Ductile means the metal can be beaten flat e.g. gold foil and tin foil.

Electricity

An electrolyte is the name given to a liquid that conducts electricity in a circuit

Switch Cell Battery

Lamp Voltmeter Ammeter

Resistor Variable resistor

Motor

Circuit symbols

Buzzer Bell Wire

In a series circuit there is only one possible route for the electricity to travel around

In a parallel circuit there is more than one route for the electricity to travel around – there are branching loops

Household appliances that are connected to parallel circuits can be switched on and off separately

An ammeter is used to measure the current in a circuit. Current is measured in Amps.

An ammeter is connected to a circuit in series

In a series circuit the current is the same at every point

In a parallel circuit the current from the branches add up to the current from the battery

A voltmeter is used to measure voltage. Voltage is measured in volts.

A voltmeter is connected to a circuit in parallel

The voltage is divided between all the components in a series circuit so there is none to return to the battery.

The voltage in each branch of a branches in a parallel circuit is equal to the voltage coming from the battery.

Heat

Heat is the total amount of heat energy in an object

Temperature is the average speed of vibration of the particles

Heat flows through a solid by conduction

Vibrating particles make other particles vibrate around them as this spreads through an object we say that heat is being conducted

The faster a particle vibrates the hotter it gets

A substance that lets heat flow through it easily is called a conductor

A substance that does not let heat flow through it is called an insulator

Air is a good insulator

Some examples of good conductors of heat are:•Metals•Copper pipes•Single glazed windows

Some examples of good insulators in the home are:•Double or triple glazed windows•Wall insulation•Silver backed board

Heat flows through liquids and gases by convection currents

As the particles heat they rise and as they move up and away from the heat they cool and sink again, this creates a current

Convection currents can be used everyday by:•Birds to gain altitude•Inside the Earth magma flows•The Gulf Stream ocean currents

Heat may be transferred through a vacuum by radiation

Radiant heat travels by Infra-red waves

A dull surface will absorb more radiant heat and a shiny surface will reflect more

A black surface will absorb more radiant heat and a white or silver surface will reflect more