1) Matter can be created and destroyed a) True b) False 2) The mass of reactants is always a) Greater than the mass of products b) Less than the mass of products c) The same as the mass of products 3) It can appear as though mass increases when a) A gas is released b) A gas is taken in c) A gas is not involved in a reaction 4) It can appear as though mass decreases when a) A gas is released b) A gas is taken in c) A gas is not involved in a reaction 5) The average is the same as the a) Mode b) Mean c) Median 6) To find the mean of 5 numbers a) Times them and add 5 b) Add them and divide by 2 c) Add them and divide by 5 d) Times them and divide by 5 7) Find the uncertainty of these values: 5, 10, 12, 11 a) 1 b) 2.5 c) 3 d) 4.5 e) 7 8) Find the uncertainty of these values 30, 35, 38, 42, 41 a) 11 b) 7.2 c) 3 d) 5.5 9) A high level of uncertainty means a) Precision is reduced b) Precision is increased c) Reliability is reduced d) Reliability is increased 10) A low level of uncertainty means a) Precision is reduced b) Precision is increased c) Reliability is reduced d) Reliability is increased 11) 6.02 x 1023 oxygen atoms is equal to a) One gram of atoms b) One mole of oxygen atoms c) Two moles of oxygen atoms d) One mole of oxygen molecules 12) 6.02 x 1023 oxygen molecule is equal to a) One gram of atoms b) One mole of oxygen atoms c) Two moles of oxygen atoms d) One mole of oxygen molecules 13) Moles = a) Mass x Mr b) Mr x Mass c) Mass/Mr d) Mr/Mass 14) In chemistry, mass is measured in a) Kilograms b) Grams c) Moles d) Tonnes 15) Mass = a) Moles x Mr b) Moles/Mr c) Mr/Moles 16) The formula for magnesium oxide is a) MgO b) Mg2O2 c) MgO2 d) 2MgO 17) How many moles of oxygen react with one mole of CH4? a) One b) Two c) Three d) Four

Quantitative chemistry

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