2. mmcl2003 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

3. mmcl2003 1.What always happens in a chemical reaction ? A new substance is always formed in a chemical reaction answer

4. mmcl2003 2.What changes might indicate that a chemical reaction has taken place? Energy change Permanent colour change Gas produced (effervescence) Solid formed in a liquid answer

5. mmcl2003 3.An element is ……… An element is the simplest type of substance. It is made up of only 1 type of atom. answer

6. mmcl2003 4.What is a GROUP in the Periodic Table? A column answer

7. mmcl2003 5.What are the Group 1 elements called? Alkali metals answer

8. mmcl2003 6.What are the Group 7 elements called? Halogens answer

9. mmcl2003 7.What are the Group 0 (8) elements called? Noble gases answer

10. mmcl2003 8.What are compounds? Substances made of two or more different types of atom joined together. answer

11. mmcl2003 9.What is the difference between a compound and a mixture? The atoms of a compound are joined together. The substances in a mixture are NOT joined and can be easily separated. answer

12. mmcl2003 10.What element is present in compounds that have names ending in –ate and –ite? oxygen answer

13. mmcl2003 11.What does -ide at the end of the name of a compound indicate? IDE means that the compound is made up of the TWO elements obvious from the name. Except: Hydroxide (something + H + 0) and Cyanide (something + C + N) answer

14. mmcl2003 12.A solute is ………. A solute is a substance ( usually a solid ) which dissolves in a solvent to form a solution. answer

15. mmcl2003 13.A solvent is ………… A liquid in which a solute dissolves. answer

16. mmcl2003 14.What is a SOLUTION? A solution is formed by dissolving a solute (usually a solid) in a solvent (usually a liquid) answer

17. mmcl2003 15.What is an AQUEOUS SOLUTION? An aqueous solution is one where the solvent used to dissolve the solute is water answer

18. mmcl2003 16.What is meant by a property of a chemical? A property of a chemical is what it is like or what it can do chemically answer

19. mmcl2003 17.What is the meaning of the words CONCENTRATED and DILUTE? Concentrated solutions have a large amount of solute in a relatively small volume of solvent. Dilute solutions have a relatively small amount of solute answer

20. mmcl2003 18.What is a SATURATED solution? A saturated solution is a solution which cannot dissolve any more solute. answer

21. mmcl2003 19.Where in the Periodic Table would you find the METALS and the NON-METALS? Metals are found to the Left Hand Side of the zigzag line; Non-metals to the Right Hand Side of the zig-zag line answer

22. mmcl2003 20.What are ATOMS? Atoms are very small, particles which make up every element. They are too small to see. answer

23. mmcl2003 21.What is a PRECIPITATE? A precipitate is a solid which forms in a liquid when a chemical change takes answer

24. mmcl2003 22.What is EFFERVESCENCE? Effervescence is bubbling and fizzing when a gas is given off. answer

25. mmcl2003 23.Give the SYMBOLS for the elements - lead, gold, sodium, potassium and iron? Lead – Pb Gold – Au Sodium – Na Potassium – K Iron - Fe answer

26. mmcl2003 24.What is the difference between COLOURLESS and CLEAR? Colourless means having no colour. Clear means you can see through something. answer

27. mmcl2003 SOLUBLE means …….. 25.SOLUBLE means …….. the substance dissolves in the solvent answer