Across
- 2. the process of extracting metals from ores using microorganisms
- 5. a substance we start with before a chemical reaction takes place
- 9. the relatively thin layer of gases that surround planet Earth
- 11. experiment being doing several times and giving the same results
- 14. arithmetical average of a series of numbers
- 15. fuel made from animal or plant products
- 19. a substance made only of one type of atom
- 21. the process whereby small amounts of dissolved substances are separated by running a solvent along a material such as absorbent paper
- 22. unreactive
- 25. separation of a liquid from a mixture by evaporation followed by condensation
- 27. the breakdown of a product
- 28. a substance made as a result of a chemical reaction
- 29. the corrosion of iron
Down
- 1. when some elements or compounds are mixed together and intermingle but do not react together
- 3. a reaction in which oxygen is removed
- 4. iron or steel objects that have been protected from rusting by thin layer of zinc metal at their surface
- 6. results that do not match the pattern seen in other data collected or are outside the range of the other repeat readings
- 7. easy ignited and capable of burning rapidly
- 8. a glass tube used to measure accurate volume of liquid
- 10. a reaction that transfers energy to the surroundings
- 12. a forecast or statement about the way something will happen in the future
- 13. a reaction that takes in energy from the surrounding
- 16. rock which contains enough metal to make it economically worthwhile to extract the metal
- 17. the technique used to separate substances that are insoluble in a particular solvent from those that are soluble
- 18. the link between the variables that were investigated
- 20. a substance made when two or more elements are chemically bonded together
- 23. the process in which waste materials are processed to be used again
- 24. the smallest part of an element
- 26. a mixture of two or more elements, at least one of which is a metal