GCSE chemistry keywords

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45 Cards. Created by jeanne ().
Keywords and definitions for GCSE chemistry
 
Term  
Definition

Accurate

A measurement is considered to be accurate if it is judged to be close to the true value

Acid

A sour substance which can attack metal, clothing or skin. When dissolved in water, its solution has a pH value less than 7. Acids are proton (H+ ion) donors.

Activation energy

The minimum energy needed for a reaction to take place.

Alkali metal

Elements in Group 1 of the periodic table e.g. lithium (Li), sodium (Na), potassium (K)

Alkali

Its solution has a pH value more than 7

Alkane

Saturated hydrocarbon with the general formula CnH2n+2, e.g. methane, ethane and propane

Alkene

Unsaturated hydrocarbon which contains the carbon-carbon double bond. Its general formula is CnH2n, e.g. ethene C2H4.

Alloy

A mixture of metals (and sometimes non metals). For example brass is a mixture of copper and zinc.

Aluminium

A low density, corrosion-resistant material used in many alloys, including those used in the aircraft industry.

Amphoteric

An oxide that displays both acidic and basic properties

Anhydrous

Describes a substance that does not contain water.

Anode

The positive electrode in electrolysis

Anomalies

Results that do not match the pattern seen in the other data collected or are well outside the range of other repeat readings. They should be retested and if necessary discarded.

Aqueous solution

The mixture made by adding a soluble solution to water.

Atmosphere

The relatively thin layer of gases that surround planet Earth.

Balanced (equation)

A symbol equation in which there are equal numbers of each type of atom on wither side of the equation.

Bar chart

A chart with rectangular bars with lengths proportional to the values that they represent. The bars should be of equal width. Also called a bar graph.

Base

The oxide, hydroxide or carbonate of a metal that will react with an acid, forming a salt as one of the products. (If a base dissolves in water it is called an alkali). Bases are proton (H+ ion) acceptors.

Biodegradable

Materials that can be broken down by microorganisms.

Biodiesel

Fuel for cars made from plant oils