GCSE Chemistry Paper 1 Topics

What is a compound?

A substance that has two or more different elements which are chemically combined.

What is a mixture?

A combination of two or more substances that are not chemically bonded.

What is the name given to Group 1 elements?

Alkali Metals.

What is the name given to the number of protons in an atom?

Atomic number.

What is the charge of a proton?

+1.

What is the charge of a neutron?

0.

What is the charge of an electron?

-1.

What particles carry electrical charge through graphite?

Delocalised electrons.

Where are fullerenes used?

In electronic components.

What is an independent variable?

When a person changes something in an experiment.

What is a dependent variable?

When we wait for something to change or happen.

What is a control variable?

Something that is kept the same during an experiment.

What is insoluble?

A substance that does not dissolve in a solvent (like water) to form a solution.

What is soluble?

A substance that can dissolve in a solvent (usually liquid) to form a solution.

What is freezing?

Liquid to Solid.

What is melting?

Solid to Liquid.

What is condensation?

Gas to Liquid.

What is evaporation/boiling?

Liquid to Gas.

What is sublimation?

Solid to Gas.

What is deposition?

Gas to Solid.

What is an endothermic reaction?

Energy that is transferred from the surroundings.

What is an exothermic reaction?

Energy is transferred to the surroundings.

What is ionic bonding?

The transfer of electrons when a metal atom transfers one or more electrons to a non-metal.

What is covalent bonding?

A chemical bond that involves the sharing of electrons to form electron pairs between atoms.

What is metallic bonding?

The strong electrostatic attraction between positively charged metal ions and delocalized electrons.

What is oxidation?

Gain of oxygen.

What is reduction?

Loss of oxygen.

What is oxidation (electrons)?

Loss of electrons.

What is reduction (electrons)?

Gain of electrons.

What pH level indicates an acid?

pH 1-6.

What pH level indicates an alkaline?

pH 8-14.

What is electrolysis?

Using electricity to break down electrolytes to form elements.

What is a weak acid?

Only partially ionised in aqueous solution.

What is a strong acid?

Fully ionised in aqueous solution.

What is an electrolyte?

A liquid/solution that can conduct electricity.

What is a cathode?

Negative electrode where reduction occurs.

What is an anode?

Positive electrode where oxidation occurs.