Chemistry IX Demo Test & SLO ref #

1) Mass is neither created nor destroyed during a chemical change, is the statement of ; SLO # 2.1.2 a) Law of conservation of mass b) Law of multiple proportion c) Law of definite proportion d) Law of reciprocal proportion

2) A formula that gives only the relative number of each type of atoms in a molecule, is called; SLO # 2.2.1 a) Empirical formula b) Molecular formula c) Molecular mass d) Formula mass

3)The relative molecular mass expressed in grams is called; SLO # 2.3.1 a) Molecular mass b) Atomic mass c) Molar mass d) Mass number

4) 44 a.m.u of carbon dioxide contains; SLO # 2.3.1 a) 6000 molecules b) 6.02 x 10 23 c) 602 x 10 23 d) 6.02 x 10 25

5)15 moles of water are equal to; SLO # 2.3.1 a) 80 gm b) 120 gm c) 270 gm d) 27 gm

6) 2KCLO3 → 2KCL + 3O2 is an example of; SLO # 2.4.1 a) Displacement reaction b) Double displacement reaction c) Addition reaction d) Decomposition reaction

7) Law of multiple proportion applicable to; SLO # 2.1.2 a) Water & Ammonia b) Carbon & Nitrogen c) Hydrogen peroxide & Water d) Oxygen & ; Nitrogen

8) Combination of symbols for atoms or ions, that are held together chemically in a compound is called; SLO # 2.2.1 a) Molecular mass b) Formula or Chemical formula c) Chemical Equation d) Both ; Empirical & molecular formulae

9) Any change, which alters the composition of a substance is; SLO # 2.1.1 a) Chemical reaction b) Physical change c) Chemical change d) Both a & c are correct

10)The molecular formula of Oxalic acid is C2 H2 O4. which of the following formulae represents its empirical formula; SLO # 2.4.6 a) CH2O2 b) CHO c) CHO2 d) C2HO2

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