Reactivity

2. A compound containing hydrogen and carbon only.
4. A reaction in which energy is transferred to the reactants from the surroundings. The temperature of the surroundings decreases.
7. If a substance has lost oxygen then it has been reduced.
10. Burning, usually in air. The reaction gives out energy, which is transferred to the surroundings by heating or light.
15. A reaction in which an acid reacts with an alkali or a base to produce a salt and water.
17. An explosive substance reacts very fast, releasing a lot of energy and gas.
20. _______ series: A list of metals that shows them in order of reactivity with the most reactive metal at the top.
21. A sub-atomic particle found outside the nucleus of an atom. It has an electrical charge of –1.
22. A flammable substance catches fire easily.
23. The central part of an atom, where protons and neutrons are found.

1. A reaction in which energy is transferred from the reactants to the surroundings. The temperature of the surroundings increases.
3. _______ table, showing all the elements in order of atomic number.
5. The amount of force pushing on a certain area. It is a way of saying how spread out a force is.
6. A sub-atomic particle found in an atom’s nucleus. It has an electrical charge of +1.
8. A sub-atomic particle found in an atom’s nucleus. It has no electrical charge.
9. The smaller particles of which atoms are made (electrons, protons, neutrons).
11. Reaction in which a substance gains oxygen.
12. A horizontal row in the periodic table.
13. _______reaction:A reaction in which one reactant is reduced and another is oxidised.
14. A vertical column in the periodic table.
16. An object is destroyed by collapsing in on itself.
18. A change in which no new substances are formed (e.g. changes of state).
19. A rock that contains enough of a certain mineral to make it worth mining.