Across
- 3. A catalyst involved in chemical reactions in living things
- 7. Group 1 elements in the periodic table, not including hydrogen; the most reactive of the metals
- 8. A pure substance formed when at least one metal and one nonmetal combine
- 10. Ability of a substance to conduct electricity
- 12. A mixture that you can see the different substances clearly/the different substance that make up the substance are visible
- 15. Group 17 elements in the periodic table; the most reactive non-metals
- 17. An experiment in which all reactants and all products of a chemical reaction are accounted for
- 19. An invisible negatively charged particle that orbits the nucleus of an atom
- 20. A chemical reaction that occurs when oxygen reacts violently with a substance to form a new substance and gives off exothermic energy
- 21. A cloudy mixture that the tiny particles of one substance is held within each other, and the particles cannot be separated from each other
- 22. Mass of one atom of an element calculated from the total number of protons, neutrons and electrons of that atom. Measured in amu
- 24. A vertical column of elements in the periodic table
Down
- 1. An atom/group of atoms that has become electrically charged because it has lost/gained electrons
- 2. A pure substance that cannot be broken down into other substances; substance made up of only one type of atom
- 4. A steady flow of charged particles
- 5. A change that results when two or more substances react to create a different substance of unique properties
- 6. The number of protons and electrons in the nucleus of one atom of an element
- 7. Group 2 elements in the periodic table: their reactivity is not as strong as that of an alkali metal
- 9. The smallest part of an element that is representative of that element; a neutral particle made up of a nucleus that contains protons/neutrons and electrons
- 10. A reaction that takes place when two or more substances react to form a new substance of unique properties
- 11. The positively charged centre of an atom that contains protons and neutrons
- 13. Combination of symbols that represent a compound: the formula identities the elements in a compound and the amount of each element
- 14. A material that electricity can move through easily
- 16. Group 18 elements in the Periodic Table of Elements that are the most stable and non reactive non-metal
- 18. A chemical combination of two or more elements in a specific ratio
- 23. substance that helps a chemical reaction to proceed more quickly