8Ec(ws) Fair Testing

A variable other than the independent variable that could affect the dependent variable and so needs to be controlled.

• Control Variable

• Dependent Variable

• Hypothesis

• Fair Test

The variable that is measured in an investigation. The values of this variable depend on those of the independent variable.

• Control Variable

• Fair Test

• Products

• Dependent Variable

What is a fair test?

• An experiment in which all the control variables are controlled and only changes in the independent variable cause changes in the dependent variable.

• Can be used to power cars. Energy is released from hydrogen (H) in a carefully controlled manner and reacts with oxygen (O). Water (H2O) is a product of this reaction.

• Any element that is shiny when polished, conducts heat and electricity well, is malleable and flexible and often has a high melting point.

• Rainwater that is more acidic than usual due to air pollution, usually caused by sulfur dioxide and nitrogen oxides dissolved in it.

Anything that can change and be measured.

• Hypothesis

• Variable

• Non-metal

• Constant

The variable that you change on purpose in an investigation.

• Dependent variable

• Fuel

• Reactants

• Independent variable