Across
- 3. Reaction that involves a substance rapidly combining with oxygen, usually accompanied by a flame; burning
- 4. Chemical compound with a pH > 7 that tastes bitter and is soapy to touch
- 6. Shorthand way of describing the ratio of elements in a compound or molecule
- 8. Solution formed by soluble bases
- 11. Reaction that involves the breakdown of a compound into simpler substances; energy in the form of heat or electricity is required to break the bonds in the reactants
- 14. Shorthand way of showing what happens to the reactants and products in a chemical reaction
- 15. Insoluble compound formed in a precipitation reaction
- 17. When solid products ‘fall out’ of solution of ionic substances
- 18. When an acid and a base react to neutralise each other and form a salt and water
- 19. Chemical substance formed in a reaction between an acid and a base, usually a metal and non-metal combination
Down
- 1. Substance that changes colour in the presence of an acid or base
- 2. Shorthand way of describing a chemical reaction in words; reactants are on one side of the equation and products on the other
- 5. Compound of carbon and hydrogen
- 6. Scientific law that states the total mass of the reactants in a chemical reaction always equals the total mass of the products
- 7. Base that dissolves in water
- 9. Chemical compound with a pH < 7 that tastes sour and contains at least one hydrogen atom
- 10. Swapping of ions between two salts in solution
- 12. Substance that is neither an acid nor a base; pH = 7
- 13. Reaction that involves the oxidation of a substance, usually a metal
- 16. Scale that indicates the relative acidity or alkalinity of a solution; ranges from 0 to 14