YEAR 10 CORE CHEMISTRY REVISION 2008 ** understanding type questions (more difficult) 1. Write definitions for the following: a) atom b) molecule c) matter d) ion e) reactant f) product g) neutralization h) precipitate i) aqueous j) mixture k) chemical formula l) cation m) anion n) chemical reaction o) base p) valency q) element r) compound s) diatomic gas t) acid u) displacement. 2. State the ‘Law of Conservation of Mass’ and explain it in your own words. 3. Write a balanced equation for hydrogen reacting with oxygen to give water. 4. i) For the formulas of the following molecular compounds, write the name and number of each type of atom combined to make the molecule. PbBr2, K2CO3, (NH4)2SO4, Ba(NO3)2, Na2S2, CaCl2, Zn(OH)2, CO2, CO, FeSO4, and AgOH. ii) Name each of the above compounds. 5. Complete the following: a) acid + base b) acid + metal **6. Complete and then balance the following: a) Mg + HCl b) Zn + H2SO4 c) Cu + HNO3 d) NaOH + HCl e) MgO + H2SO4 f) KOH + HNO3 7. Name the acid (and base where appropriate) used and the products formed in each of the above reactions. 8. i) Name the following ions: + - 2+ 2- 2+ 2- a) Na b) Cl c) Cu d) O e) Zn f) S ii) For each of the ions in a) above, determine how many electrons have been lost or gained. 9. Write the ion for the following: a) Aluminium ion c) Calcium ion e) ammonium ion b) Fluoride ion d) nitride ion f) nitrate ion 10. Write the ion for an atom that has: a) lost 2 electrons e.g. Magnesium (Mg) b) gained an electron e.g. Bromium (Br) c) lost 3 electrons e.g. Iron (Fe) 11. True or False a. The horizontal rows of the periodic table are called periods. b. The vertical columns of the periodic table are called columns. c. The elements in the vertical columns all have similar properties. d. Sulphur and oxygen have similar properties. e. sodium and chlorine have similar properties. 12. How many electrons have been lost or gained in the following ions? a) NO3 3- c) N 2+ 3+ b) Mg d) Fe 13. The gold atom becomes a positive ion by (gaining / losing) two (protons / electrons)? 14. An atom with 25 protons and 27 electrons has a charge of what? 15. An atom with 79 electrons and 76 protons has a charge of what? 16. An atom with 33 protons and 32 electrons has a charge of what? 17. Consider the reaction below: ZnCl2 (aq) + 2AgNO3 (aq) 2AgCl (s) + Zn(NO3)2 (aq) a. Identify and name the reactants and the products. b. What do the symbols (s) and (aq) indicate? 18. Name the following polyatomic ions: a. SO42 b. NO3 c. NH4+ d. OH e. CO32– 19. Write the formula for the following: Hydrochloric acid, nitric acid, sulphuric acid, sodium hydroxide and ammonia. 20 a. What ion(s) are contained in all acids? b. What ion(s) are contained in all bases? 21. Write down the formula of the following polyatomic ions: a. carbonate b. sulphate c. ammonium 22. What does the periodic table show? 23. Name these acids: HCl, HNO3, H2SO4, HCH3COO . 24. Answer true or false a. oxygen and sulphur have similar properties. b. Boron and Aluminium have similar properties. c. sodium and carbon have similar properties. d. lithium and potassium react in a similar way. 25. Balance the following reactions: a. Ba(NO3)2 + K2SO4 → KNO3 + BaSO4 b. CH4 + O2 → H2O + CO2 c. FeCl3 + AgNO3 → Fe(NO3)3 + AgCl d. H2SO4 + Cu(OH)2 → CuSO4 + H2O **26. Complete the following word equations and then rewrite them as balanced formula equations. i) Sodium Iodide + Calcium Chloride ii) Potassium Hydroxide + Silver Nitrate iii) Copper(I) Sulphate + Barium Chloride iv) Sodium Carbonate + Magnesium Hydroxide v) Lead(II)Nitrate + Potassium Iodide 27. Identify the atom that is in period 3 group 5 and the atom that is in period 1 group 18 of the periodic table. 28. Describe and give an example of : decomposition reaction; combustion reaction; combination reaction, precipitation reaction, acid-base reaction and a metal replacement reaction.