Across
- 2. A substance that undergoes chemical change
- 7. A substance that reacts an acid to form a salt and water
- 8. A solid which form and settles in a solution
- 10. The substances formed as a result of chemical change
- 12. The way chemists write down chemical reactions
- 15. An Ion with a positive electric charge
- 16. A chemical reaction that gives off energy
- 18. The removal of acidity or alkalinity in a substance
- 19. A way of describing the composition of a substance, using symbols or numbers
Down
- 1. A chemical reaction that takes in energy
- 3. A substance which contains hydrogen that can be replaced by a metal in solution, it turns litmus red
- 4. The smallest particle of a compound which can normally exist by itself and still have the properties of the substance
- 5. A substance containing two or more elements which have been chemically combined
- 6. The energy needed for a reaction to occur
- 9. The measure of acidity or alkalinity in a substance
- 11. A compound made up of molecules: the molecules consist of atoms that are linked by sharing electrons
- 13. A substance which alter the speed of a chemical reaction but remains chemically unchanged itself at the end of the reaction
- 14. A compound mad up of ions
- 17. A changed particle: an atom or group of atoms which has lost or gained electrons
- 20. An ion with a negative electric charge