A student investigated the rate of reaction between magnesium ribbon and hydrochloric acid.
a.[1]
Balance the chemical equation for this reaction:
Mg+‾ HCl→MgCl2+H2\mathrm{Mg + \underline{\quad}\,HCl \rightarrow MgCl_2 + H_2}Mg+HCl→MgCl2+H2
b.[1]
During the reaction, the student recorded the volume of hydrogen gas produced over time. The results are plotted below:
What happened to the rate of reaction between 60 and 90 seconds?
- The rate of reaction increased
- The rate of reaction decreased
- The rate of reaction stayed at zero
c.[1]
The student repeated the experiment at a lower temperature, keeping all other variables constant. How would the initial line of best fit compare to the original line on the graph?
- Initially the line of best fit would be less steep
- Initially the line of best fit would be the same steepness
- Initially the line of best fit would be steeper