Key Terms
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Define accurate.
Close to the true value.
What is an acid?
• The chemical opposite of an alkali. • Has a pH less than 7 when dissolved in water. • Release H+ ions.
What is activation energy?
The minimum energy needed to start a reaction.
What is an alkali?
Its solution has a pH more than 7.
What is an alkali metal?
An element in Group 1 of the periodic table.
Name the alkali metals.
• Lithium • Sodium • Potassium • Rubidium • Caesium • Francium
What is an alkane?
• Saturated hydrocarbon. - Formula of CnH2n+2
Name the first five alkanes.
• Methane • Ethane • Propane • Butane • Pentane
What is an alkene?
• Unsaturated hydrocarbon • Contains a double carbon bond. • Formula of CnH2n
Name the first two alkenes.
• Ethene - Propene
What is an alloy?
A mixture of metals.
What does the alloy brass contain?
• Copper - Zinc
What is aluminium?
• Low density, corrosion resistant metal. • Used in many alloys. • Used for aircrafts.
What is an anhydrous substance?
A substance which doesn’t contain water.
What are anomalous results?
-Results that don’t match the pattern.
What should be done with anomalous results?
Discarded and retested.
What is an aqueous solution?
A mixture made by adding a soluble substance to water.
What is the atmosphere?
The thin layer of gases that surround the Earth.
What is an atom?
The smallest part of an element that can still be recognised as that element.
What is an atomic number?
The number of protons in an atom.
What is a base?
• The oxide, hydroxide or carbonate of a metal that will react with an acid to form a salt. • H+ ion acceptors.
What is a biodegradable material?
A material that can be broken down by microbes.
What is biodiesel?
Fuel made from plant oils.
What is bioleaching?
A process of extraction of metals from ores using microbes.