1) What is the conservation of mass? a) Atoms can be created or destroyed b) Energy cannot be created or destroyed c) Matter can be created or destroyed d) Atoms cannot be created or destroyed  2) When a metal forms a metal oxide, why does the mass increase? a) Because oxygen atoms have been added b) Because oxygen atoms have been removed c) Because the metal atoms have changed into a different element d) Because the metal has evaporated 3) When an acid reacts with a metal, why does the mass decrease? a) Because a gas is produced and escapes b) Because the metal atoms combine to form a solid c) Because the acid has evaporated d) Atoms can be created or destroyed e) Energy cannot be created or destroyed f) Matter can be created or destroyed 4) What is relative formula mass? a) The sum of the relative masses of each atom in a compound b) The mass of a compound in grams c) The mass of a single atom d) The sum of the atomic numbers of each atom in a compound 5) What are the four state symbols and what do they stand for? a) (s) solution, (l) liquid, (g) gel, (aq) aqueous b) (s) solid, (l) light, (g) gas, (aq) aqueous c) (s) solid, (l) liquid, (g) gas, (aq) acid d) (s) solid, (l) liquid, (g) gas, (aq) aqueous 6) What symbol do we use for relative formula mass? a) Mw b) Mf c) Rf d) Mr 7) What is a mole? a) A small animal b) A unit of mass c) A number of particles d) A chemical reaction 8) What is Avogadro's number? a) 6.022x10^23 b) 3.14159 c) 9.8 m/s^2 d) 2.71828 9) What formula relates moles, mass and Mr? a) Moles = mass x Mr b) Moles = mass - Mr c) Moles = mass/Mr d) Moles = mass + Mr 10) What is a limiting rectant? a) A reactant that does not have enough mass to react with all the product b) A reactant that reacts completely and is fully consumed c) A reactant that is added in excess to ensure complete reaction d) A reactant that is highly reactive and drives the reaction forward 11) What is the unit for concentration? (Double only) a) g/L b) g/dm^3 c) mol/m^3 d) kg/m^3 12) Which formula relates concentration, mass and volume? a) concentration = mass x volume b) concentration = mass - volume c) concentration = mass + volume d) concentration = mass/volume 13) If the amount of solute in a solution is increased, what happens to its concentration? a) Stays the same b) Decreases c) Increases d) Becomes zero 14) If the volume of water in a solution is increased, what happens to its concentration? a) Stays the same b) Decreases c) Increases d) Becomes zero 15) What is the yield of a chemical reaction? a) The amount of starting material used b) The amount of energy released c) The amount of useful product d) The amount of waste produced

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