Question | Answer |
Chemistry | Scientific study of matter, its properties and its interaction with other matter and energy |
Model | A representation of something based on a set of assumptions, usually determined through experiments |
Charge | The net effect of losing or gaining atoms |
Atom | The smallest particle of an element |
Element | A substance made of only 1 type of atom |
Molecule | A group of atoms joined by bonds |
Compound | A group of different atoms that are joined in a fixed ratio |
Periodic Table | The arrangement of elements into a table of groups and periods |
Electron shells | The arrangement of electrons around the nucleus based on energy levels |
Chemical formula | A shorthand way of writing the name of an element or compound |
Word equation | Show the changes that occur in a chemical reaction |
Chemical reaction | Interactions in which atoms exchange or share electrons forming new chemical compounds |
Reactant | The chemical compounds that combine to start a chemical reaction |
Products | The chemical compounds that are produced during a chemical reaction |
Protons | Defining components of atom which are found in the nucleus and have a positive charge |
Neutron | Particles with no charge in an atom which create different isotopes |
Electron | Negatively charged components of an atom which orbit the neuclus |
Ion | Charged atom due to a different amount of protons to electrons |
Isotope | Atoms of element with different number of neutrons |
Nucleus | Makes up 1/10,000 of space in atom |
Chemical symbol | Unique 1-3 letters which name a chemical |
Atomic number | Number of protons in 1 atom of element |
Atomic weight | Average weight of 1 atom of element |
Period | Row of elements |
Mass number | Number of protons + number of neutrons |
Electrolysis | Using electricity to cause a chemical change |
Decomposition | Breakdown of compound into simpler substances |
Ionic | Type of compound made from attraction of metal and non-metal ions |
Covalent | Type of compound made from 2 non-metals that share electrons |
Lattice | Large array of atoms or ions that repeats itself millions of times |
Flame test | Where the colours of the flame are used to identify the types of atoms present |
Equation | A written record of the reactants and products in a chemical reaction |
Lime-water | Reagent used to test for presence of carbon dioxide |
Limestone | Types of rock dissolved away by carbon dioxide gas dissolved in rainwater |
Precipitate | An insoluble substance that forms when ions come together |
Suspension | An insoluble substance shaken in water |
Neutralisation | Reaction where an acid and a base react and destroy each other |
Calcium carbonate | Chemical substance present in lime, limestone, caves, chalk and cement |
Combustion | Burning |
Combination | 2 elements combining to form a single compound |