Reactivity, energy and reactions

A substance that provides oxygen to oxidise another substance.

• oxidation

• oxidising agent

• exothermic agent

• endothermic agent

A change or reaction that absorbs energy from the surroundings, making the temperature of the surroundings fall.

• endothermic reaction

• exothermic reaction

• energy transfer

• Heating

A change or reaction that transfers energy into the surroundings, making the temperature in the surroundings rise.

• endothermic reaction

• exothermic reaction

• oxidation

• heat

Which of the following is a chemical change?

• condensation

• evaporation

• combustion

• melting

Which of the following examples is a physical change?

• Frying an egg

• Heating a candle until it becomes liquid

• combustion

• Iron rusting

Why does pressure in a gas increase when you reduce the size of the container?

• There are less particles

• The particles are moving faster

• The particles have more energy

• There are more collisions between the particles and the surface

The reactivity series is a list of _________ in order of reactivity, with the most reactive at the _______.

• non-metals; bottom

• metals; top

• non-metals; top

• metals; bottom

Complete the equation: metal + water → ________________

• metal + water → metal oxide

• metal + water → salt + hydrogen

• metal + water → metal hydroxide + oxygen

• metal + water → metal hydroxide + hydrogen

What is the name of the substance which releases oxygen and is often used in explosives?

• hydrogen

• reducing agent

• potassium nitrate

• oxygen

Which of these metal is most reactive?

• Lithium

• Aluminium

• Lead

• Copper