1) Substance producing more hydrogen ions than hydroxide ions when dissolved in water. a) acid b) alkali 2) The positive electrode during electrolysis. a) cathode b) anode 3) written using the symbols and formulae of the reactants and products, so that the number of units of each element present is the same on both sides of the arrow. a) balanced symbol equation b) word equation c) equation triangle d) reversible reaction 4) The negative electrode during electrolysis. a) cathode b) anode 5) ubstance formed by the chemical union of two or more elements. a) element b) mixture c) compound 6) Take the place of another substance in a chemical reaction. a) neutralise b) oxidise c) reduce d) displace 7) A reaction that occurs when a more reactive element replaces a less reactive element in a compound. a) displacement b) combustion c) thermal decomposition d) redox 8) A conductor used to establish electrical contact with a circuit. a) battery b) wire c) crocodile clip d) electrode 9) The decomposition (breakdown) of a compound using an electric current. a) thermal decomposition b) electrolysis c) neutralisation d) combustion 10) A substance which will conduct an electric current. a) salt solution b) electrolyte c) all of these d) molten salt e) metal 11) Subatomic particle, with a negative charge and a negligible mass a) proton b) electron c) neutron 12) process of obtaining a metal from a mineral a) electrolysis b) reduction c) extraction d) all of these 13) An equation, involving ions and electrons, that describes the process happening at an electrode. a) full b) whole c) half d) quarter e) minute 14) Unable to dissolve in a particular solvent. a) soluble b) insoluble 15) Electrically charged particle, formed when an atom or molecule gains or loses electrons. a) sub-atomic b) neutron c) beta particle d) ion 16) bond formed between a metal and non-metal a) ionic b) covalent c) metallic 17) A chemical equation that shows how positively charged ions join with negatively charged ions to make a compound. a) half equation b) ionic equation c) radioactive equation 18) The temperature at which a solid changes into a liquid as it is heated. a) melting point b) boiling point c) sublimation 19) Shiny element that is a good conductor of electricity and heat, and which forms basic oxides. a) halogen b) non-metal c) metal d) noble gas 20) A term used to describe a substance (eg rock, glass or metal) formed by heating a solid to past its melting point a) liquid b) molten c) fluid d) all of these 21) A rock containing enough quantities of a mineral for extraction to be possible. a) fraction b) ore c) base d) compound 22) The gain of oxygen, or loss of electrons, by a substance during a chemical reaction. a) reduction b) oxidation 23) A list of elements in order of their reactivity, usually from most reactive to least reactive. a) reactivity series b) pH scale c) Periodic series d) reactivity scale 24) When reduction and oxidation take place at the same time. a) neutralisation b) redox c) decomposition d) combustion 25) The loss of oxygen, gain of electrons, or gain of hydrogen by a substance during a chemical reaction. a) reduction b) oxidation 26) The substance formed when the hydrogen ion in an acid is replaced by a metal ion. a) water b) carbon dioxide c) hydrogen d) salt 27) Mixture formed by a solute and a solvent. a) mixture b) solution c) both of these 28) what does INERT mean? a) explosive b) reacts vigorously c) unreactive 29) Substance producing more hydroxide ions than hydrogen ions when dissolved in water. a) acid b) alkali 30) A solid containing particles (atoms, molecules or ions) joined together to form a regular arrangement or repeating pattern a) crystal b) solution c) solvent d) filtrate 31) The breaking up of a molecule into ions when dissolved in water. a) neutralisation b) solution c) dissociation d) combustion 32) The process in which a liquid changes state and turns into a gas. a) crystallisation b) condensing c) subliming d) evaporation 33) if there is more than enough of it to react with another reactant. a) it is in excess b) the chemist was wasteful 34) Method used to separate an insoluble solid from a liquid using a physical barrier such as paper. a) crystallisation b) filtration c) chromatography 35) Able to ignite and burn. a) volatile b) flammable c) viscous 36) A substance that has different colours, depending upon the pH of the solution it is in. a) universal indicator b) litmus paper c) pH paper d) colourful fruit and veg e) all of these f) phenolphthalein 37) A type of indicator that can be red or blue. a) universal indicator b) litmus paper c) pH paper d) phenolphthalein e) all of these 38) Unable to contain any more liquid. a) fluid b) unsaturated c) saturated d) solid 39) positive and negative a) charge b) magnetism c) electricity force 40) a material which allows an electrical current to pass through it easily. It has a low resistance. a) insulator b) conductor 41) An ion formed when a halogen atom (an atom from group 7) gains one electron. a) salt b) inert compound c) halide d) alkali 42) An element placed in group 7 of the periodic table a) Alkali metal b) alkaline earth metal c) halogen d) noble gas

C5.4 Chemical Changes

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