topic 6 pretest

1) B x D you can also measure rate of reaction by pH
2) A
3) D
4) D x B II is right, but I is wrong- same mass of magnesium (reactant) will have the same amount of product
5) C
6) B
7) C
11a) they could measure the gas of carbon dioxide produce over time and plot on a graph- collect using gas syringe/inverted measuring cylinder and stopwatch. They could also measure the mass of the beaker and the content as carbon dioxide will escape so the weight will decrease. Using a top pan balance and stopwatch.
b) The rate of this reaction could increase by using more concentrated acid=more particles within the same volume so the chance of successful collision increases, increase the surface area of magnesium carbonate (decrease size) reactions occur on the surface so by increasing surface area there will be more reaction going on= speeds up the reaction, it could increase temperature because it will increase the kinetic energy which more of if will exceed the activation energy/ increase collision frequency.
ci) It would stay the same as lumps of magnesium carbonate is already in excess
cii) The volume would stay the same as the temperature only increases the rate of reaction. You haven’t change anything else. Same quantities used.