Jeddah Knowledge International School

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1 Jeddah Knowledge International School Science Revision Pack Quarter 1 Grade 9 Name: Section: Science Revision Pack Grade Nine Quarter One Page 1

2 Revision Pack Grade 9 Chemistry Question 1: Circle the best answer: 1. The chemical formulae of two substances, W and X, are given. W NaAlSi 3 O 8 X CaAl 2 Si 2 O 8 Which statements are correct? 1 W and X contain the same amount of oxygen. 2 W contains three times as much silicon as X. 3 X contains twice as much Aluminium as W. A 1 and 2 B 1 and 3 C 2 and 3 D 1, 2 and 3 2. A shorter, easier way to show chemical reactions, using symbols instead of words, is called a. Physical equation. b. Chemical formula. c. Chemical Symbol equation. d. Subscript. Science Revision Pack Grade Nine Quarter One Page 2

3 3. A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be A. Balanced. B. Unbalanced. C. An incomplete reaction. D. A replacement reaction. 4. In chemical reactions, what does the principle of conservation of mass mean? a. Matter is not created or destroyed. b. The total mass of the reactants is greater than the total mass of the products. c. The total mass of the reactants is less than the total mass of the products. d. State of matter is not changed. 5. A rapid reaction between oxygen and a fuel is known as a. Combustion. b. Heat. c. Activation. d. Decomposition. Question 2: Balance the following equations: - N O NO 2 - K 2 CO HCl --- KCl + CO 2 + H C 3 H O CO 2 + 4H 2 O - Fe 2 O CO --- Fe CO 2 - Ca(OH) HCl CaCl H 2 O - 2Al HCl 2AlCl H Mg + O 2 ---MgO Science Revision Pack Grade Nine Quarter One Page 3

4 - Ca Cl CaCl H O H 2 O Question 3: Write these as word equations: - Zn + 2HCl ZnCl 2 + H Mg + CO 2 2MgO + C. - ZnO + C Zn + CO. - Cl 2 + 2NaBr 2 NaCl + Br 2. Question 4: Give the formula of the following compounds: Hydrogen Chloride (Hydrochloric acid) Magnesium oxide Water Carbon dioxide Potassium chloride Table Salt (sodium chloride) Science Revision Pack Grade Nine Quarter One Page 4

5 Methane Carbon monoxide Silicon dioxide Sodium Hydroxide Question 5: Name the following compounds: MgO PbO CO CaCl 2 Na 2 SO 4 H 2 O Question 6: Fill in the following blanks with the correct answer. 1. The number of atoms in Na 2 SO 4 is. 2. In a neutralization reaction, and water are produced. 3. The sudden formation of a solid, either when two solutions are mixed or when a gas is bubbled into a solution is called 4. If a substance oxygen, it is oxidized.the agent that is used in this reaction is. 5. The reaction of a substance with oxygen causing the release of energy is called. 6. When bending a metal, this is considered a change, while the reaction Science Revision Pack Grade Nine Quarter One Page 5

6 between carbon carbonate and limewater is considered a change. 7. In a change the substances are often easy to reverse. 8. The end substances in a chemical reaction are called. 10. The law that states that no matter is created nor destroyed is. 11. If the equation has equal number of atoms of elements on each side of the reaction then it is considered. 12. The number that is placed before the element or compound is called. 13. reaction is when two or substances react to form one product. Question 7: Identify each property as either a chemical change or a physical change Boiling point Gives off light Shape Length Texture Dissolves Rusting of Iron Perfume evaporating on your skin Digesting food Mixing sugar in water Density A precipitate forms State of matter Temperature change Burning of a paper Bubbles Changes color Burning sugar Butter melting A hot glass cracking when placed in cold Science Revision Pack Grade Nine Quarter One Page 6

7 Question 8: Balance the following reactions and indicate which of the six types of chemical reaction are being represented: a) NaBr + Ca(OH) 2 CaBr 2 + NaOH Type of reaction: b) NH 3 + H 2 SO 4 (NH 4 ) 2 SO 4 Type of reaction: c) C 5 H 9 O + O 2 CO 2 + H 2 O Type of reaction:. d) Pb + H 3 PO 4 H 2 + Pb 3 (PO 4 ) 2 Type of reaction: e) Li 3 N + NH 4 NO 3 LiNO 3 + (NH 4 ) 3 N Type of reaction: f) HBr + Al(OH) 3 H 2 O + AlBr 3 Type of reaction: g) Na 3 PO 4 + KOH NaOH + K 3 PO 4 Reaction Type: h) MgCl 2 + Li 2 CO 3 MgCO 3 + LiCl Science Revision Pack Grade Nine Quarter One Page 7

8 i) C 6 H 12 + O 2 CO 2 + H 2 O Reaction Type: j) Pb + FeSO 4 PbSO 4 + Fe Reaction Type: k) CaCO 3 CaO + CO 2 Reaction Type l) P 4 + O 2 P 2 O 3 m) RbNO 3 + BeF 2 Be(NO 3 ) 2 + RbF n) AgNO 3 + Cu Cu(NO 3 ) 2 + Ag Reaction Type: o) C 3 H 6 O + O 2 CO 2 + H 2 O p) C 5 H 5 + Fe Fe(C 5 H 5 ) 2 q) SeCl 6 + O 2 SeO 2 + Cl 2 r) MgI 2 + Mn(SO 3 ) 2 MgSO 3 + MnI 4 s) O 3 O. + O 2 t) NO 2 O 2 + N 2 Science Revision Pack Grade Nine Quarter One Page 8

9 Question 9: a) What type of chemical reaction absorbs energy and requires energy for the reaction to occur? A: endothermic B: exothermic C: synthesis D: both A and B b) What type of reaction releases energy and does not require initial energy to occur? A: endothermic B: exothermic C: decomposition D: both A and B c) Which type of reactions cannot occur spontaneously? A: endothermic B: exothermic C: neither d) Any type of reaction that involves burning (combustion) can be classified as which of the following types of reactions? A: synthesis B: endothermic C: exothermic D: all of the above e) Burning sugar is an exothermic process. A: True B: False Science Revision Pack Grade Nine Quarter One Page 9