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2. What is a group in the Periodic Table? A column of elements

3. What is a period in the Periodic Table? A row of elements

4. Why are elements placed in the same group ? They have similar chemical properties. They have the same number of outer electrons.

5. Give the family name for the elements found in group 1. Alkali metals

6. In which group do the halogens belong to? Group 7

7. Give the family name for the elements found in group 0. Noble gases

8. What name is given to the elements found between group 2 and group 3 in the Periodic Table? Transition metals

9. What does the name ending in -ide indicate about a compound? Two elements joined together

10. What does the name ending in -ate or ite indicate about a compound? 3 elements joined together - one of which is oxygen

11. Name the elements present in sodium silicate. Sodium, silicon and oxygen

12. Name the elements present in sodium chloride. Sodium and chlorine

13. Name the elements present in calcium hydroxide. Calcium, hydrogen and oxygen.

14. What is the difference between a mixture and a compound? Mixture - different atoms not chemically joined. Compound - different atoms joined together

15. What is an element? A substance made up of one type of atom.

16. What is always formed in a chemical reaction? New substance

17. Name the type of chemical reaction which releases heat. Exothermic

18. In an endothermic reaction do the reactants or products have more energy? Products - energy taken in reactants products

19. In an exothermic reaction do the products have more or less energy than the reactants? Less - energy is released reactants products

20. What changes indicate a chemical reaction has taken place? Colour change, energy change, gas given off, effervescence, precipitation

21. What is a precipitation reaction? Two solutions(aq) react together to form a solid (s) Ba(NO 3 ) 2 (aq) + Na 2 SO 4 (aq) BaSO 4 (s) + NaNO 3 (aq) the precipitate

22. Is air a mixture of gases or a compound? A mixture of gases

23. What is the percentage of nitrogen and oxygen in air? Nitrogen ~ 80% Oxygen ~ 20%

24. What is the test for oxygen gas? Relights a glowing splint

25. Why is the test for oxygen in air not positive? There is not enough oxygen in the air

26. What is meant by the following terms? solute, solvent, solution and saturated Solute - a substance which dissolves in a liquid (soluble) Solvent - a liquid in which a solid dissolves Solution - a mixture formed when a solute dissolves in a solvent Saturated - a solution in which no more substance can dissolve.

27. Which has a lower concentration of dissolved substance, a dilute or concentrated solution? A dilute solution.

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