Terms and definitions for the Sci 1.5 Chemistry paper "Demonstrate an Understanding of Aspects of Acids and Bases
A substance which gives H+ ions in solution.
A chemical which gives hydroxide ions in a reaction.
A base which will dissolve in water eg. NaOH
A solution with a ph above 7
A number scale which indicates the degree of acidity or alkalinity
To make the pH of a solution equal 7
A positively charged hydrogen atom
Ions formed from bases in a reaction (OH- )
Solution which is neither acidic nor alkaline (ph = 7).
To remove liquid from a solution by changing it into a gas.
A substance where different types of atoms are chemically bonded in fixed amounts.
A compound formed when a metal or base reacts with an acid.
A flame makes this gas explode with a squeaky pop.
Glowing splint placed in this gas relights.
Carbon dioxide test
Clear limewater turns milky when this gas is bubbled through it.
Chemical used to test for carbon dioxide gas.
Elements that are shiny, malleable, ductile and good conductors of heat and electricity
Compounds which release carbon dioxide with acid.
Another name for Hydrogen carbonates.
The chemical name for limewater
Able to be dissolved
Rain that has a ph less than 7
Chemical that helps neutralise an acid (eg stomach acid)
Reaction between an acid and a base
Acids which give all of their hydrogen ions in a reaction
Acids which give only a few of their hydrogen ions in a reaction
A base which gives lots of hydroxide ions in a reaction
A base which gives only a few hydroxide ions in a reaction
A small amount of chemical dissolved in a given volume
A large amount of chemical dissolved in a given volume
Anything that has mass and occupies space
Substance made up of one type of atom only
Substance made from different elements or compounds that are not chemically joined
Substance made of two or more elements joined together chemically in fixed amounts
Very small particles which make up all matter
Central part of an atom made up of protons and neutrons.
Positively charged subatomic particle
Very small, negatively charged subatomic particles
Uncharged subatomic particles
An atom with equal numbers of protons and electrons
Number of protons in an atom
Number of protons and neutrons in an atom
Space that electrons with equal energy occupy
Electrons in the outer shell of an atom
Chart with elements arranged in periods and groups
A column of the periodic table
A row of the periodic table
Atoms of the same element with a different mass number due to different numbers of neutrons
An atom or group of atoms that has lost or gained electrons
Positively charged ion (because it has lost electrons)
Negatively charged ion (because it has gained electrons)
Shows the number and type of atoms in a formula
The attractive force which holds particles in a substance together
Bond formed by attractions of positive cation to negative anion
Bond in which atoms share electrons equally to get a full shell
What occurs when new chemical substances are formed
The starting substances in a reaction
The new substances formed in a reaction
Writing a reaction using the formulae of chemicals
A group of atoms covalently joined together
Compound made up of positive and negative ions
Compound made up of atoms joined covalently together
How fast a chemical reaction occurs
Explains that a reaction will only occur if the reactants collide with enough energy to break existing bonds
Frequency of collisions
The number of collisions by reactants
Effectiveness of collisions
The right alignment and force of collisions between reactants
Amount (in moles per Litre) of a substance
Moles per Litre - unit of concentration
Average kinetic energy of substances
Area of the particles exposed for collisions
Substance which speeds up a reaction without being used up
A biological catalyst
Catalysts which speed up industrial processes to make them more efficient and economical
Activation energy (EA)
The minimum amount of energy needed to start a reaction
Chemical reaction which gives out energy
Chemical reaction which takes in energy
Orientation of reactants
The way the reactants are in the right alignment or position before colliding