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1) What is the name given to the number 6.02 x1023 particles? a) The mole b) A lot c) Rutherford's Number d) Heisenberg's Number 2) What is the law of conservation of mass? a) The mass in a chemical reaction changes from reactants to products b) Mass always goes up in a chemical reaction c) Mass always goes down in a chemical reaction d) No atoms are gained or lost during a chemical reaction. 3) What is the symbol for relative atomic mass? a) Mr b) Ar c) At R d) Rel Atm 4) Which element are the masses of all other elements compared to as 'the standard'? a) Carbon-12 b) Oxygen-16 c) Hydrogen-1 d) Gold-197 5) What is the symbol for formula mass? a) Ar b) Form Mass c) Mf d) Mr 6) How is the formula mass of a compound calculated? a) The atomic masses of each element in the compound are added together. b) Atomic masses are multiplied together. c) Atomic masses are added and divided by how many atoms there are. d) Atomic masses are added and then multiplied by Avogadro's number. 7) What is the formula mass of calcium carbonate, CaCO3? a) 96 b) 100 c) 78 d) 110 8) If the total Mr of all the reactants in a chemical reaction is 420, what is the total Mr of all the products? a) 210 b) 840 c) 10 d) 420 9) If a reaction involves addition of oxygen, what will happen to the mass of the reactant? a) It will increase b) It will decrease c) It will stay the same d) It will go up then down again. 10) If thermal decomposition is carried out in an open reaction vessel, what will happen to the mass of the reactant a) It will increase b) It will decrease c) It will stay the same d) It will go up then down 11) If I have 40g of NaOH, how many moles do I have? a) 40 b) 1 c) 17 d) 400 12) How much Al2O3 is needed to react with 112g of Fe? a) 51g b) 112g c) 204g d) 102g 13) How many atoms are there in CuCO3? a) 5 b) 3 c) 4 d) 6 14) How many different elements are there in CuCO3? a) 5 b) 3 c) 4 d) 6 15) How many oxygen atoms are on the right of this unbalanced equation: C2H6 + O2 produces 2CO2 + 3H2O a) 3 b) 5 c) 7 d) 6 16) What number would be needed in front of the oxygen atoms on the left of this unbalanced equation: C2H6 + O2 produces 2CO2 + 3H2O? a) 3 b) 4 c) 3.5 d) 2 17) What term is used to describe a reactant that you have more than you need of? a) In excess b) Loads of it c) Major reactant d) Reactant A 18) What term is used to describe a reactant that you have too little of to react with all of the other reactants? a) Shortage reactant b) Not much of it c) Reactant B d) Limiting reactant 19) What are the standard units of mass in Chemistry? a) grams b) tonnes c) milligrams d) kilograms 20) What is the formula that links moles, mass and formula mass? a) n = m/Mr b) n = Mr x m c) n = Mr/m d) n = Mr / 6.02x1023 21) What are the standard units of concentration in chemistry? a) mol/litre b) mol/dm3 c) mol/cm3 d) mol/gallon 22) What is another name for 1 dm3? a) A litre b) A gallon c) A pint d) A mole 23) How do you convert cm3 into dm3? a) You don't need to b) With difficulty c) Multiply by 1000 d) Divide by 1000 24) Concentration can also be measured in another unit, given by dividing the mass of a solute by the volume it is dissolved in. What units would this lead to? a) g / dm3 b) g / vol c) g / litre d) g / cubic metre 25) What is the equation that links concentration, moles and volume? a) c = m/v b) c = m x v c) c = m x v x 6.02x1023 d) m = c / v