Year 8 Chemistry Exam Revision

Flashcards for key concepts and vocabulary from Year 8 Chemistry Exam Revision.

Mean

The average of a set of data, calculated by adding all values and dividing by the number of values.

Independent Variable

The variable that is changed or controlled in a scientific experiment.

Dependent Variable

The variable that is measured or affected in an experiment.

Control Variables

Variables that are kept constant to ensure a fair test.

Saturated Solution

A solution in which no more solute can dissolve at a given temperature.

Filtration

A separation technique used to remove solid particles from a liquid or gas.

Distillation

A process to separate mixtures of miscible liquids based on differences in boiling points.

Chromatography

A technique used to separate and analyze mixtures based on their movement through a medium.

Rf Value

The ratio of the distance traveled by the substance to the distance traveled by the solvent front in chromatography.

Periodic Table

A tabular arrangement of elements based on their atomic number, electron configuration, and recurring chemical properties.

Metals

Elements that are usually good conductors of heat and electricity, malleable and ductile.

Non-Metals

Elements that are generally poor conductors of heat and electricity, and typically have more varied physical properties.

Reactivity Series

A list of metals arranged in order of decreasing reactivity.

Group 0 Elements

Noble gases that are colorless, odorless, and inert.

Displacement Reaction

A type of chemical reaction where one element displaces another in a compound.

Particle Model

A model that describes the arrangement and movement of particles in mixtures and solutions.

Dissolving

The process of a solute mixing with a solvent to form a solution.

Melting

The process of a solid turning into a liquid, typically due to heat.

Solute

The substance that is dissolved in a solution.

Solvent

The substance in which the solute is dissolved to form a solution.

Concentration

The amount of solute dissolved in a given volume of solvent, often expressed in molarity or percentage.

pH Scale

A scale used to measure the acidity or basicity of a solution, ranging from 0 to 14.

Catalyst

A substance that speeds up a chemical reaction without being consumed in the process.

Endothermic Reaction

A chemical reaction that absorbs heat from the surroundings.

Exothermic Reaction

A chemical reaction that releases heat to the surroundings.

Chemical Equation

A symbolic representation of a chemical reaction showing the