Give one use of ethane. 2. Plot a graph of total volume of gas produced against time using the provided data.

Here are the answers to your questions:

1. Give one use of ethane. (1mk)

   • Ethane is used as a fuel or as a feedstock in the production of ethene (ethylene).

2. In an experiment to study the rate of reaction between duralumin (an alloy of aluminium, magnesium and copper) and hydrochloric acid, 0.5g of the alloy were reacted with excess 4M hydrochloric acid. The data below was recorded:

   • a) On the grid provided, plot a graph of total volume of gas produced (vertical axis) against time. (3mks)

   Instructions for plotting the graph:

   1. Axes:
      • The vertical axis (Y-axis) should be labeled "Total volume of gas (cm³)".
      • The horizontal axis (X-axis) should be labeled "Time (Minutes)".
   2. Scale:
      • For the X-axis (Time): Use a scale where 1 major grid square represents 1 minute.
      • For the Y-axis (Total volume of gas): Use a scale where 1 major grid square represents 100 cm³. (Each small square will then represent 20 cm³).
   3. Plotting points: Plot the following points accurately on the grid:
      • (1, 0)
      • (2, 220)
      • (3, 410)
      • (4, 540)
      • (5, 620)
      • (6, 640)
      • (7, 640)
   4. Draw curve: Draw a smooth curve that passes through all the plotted points. The curve should start at the origin and level off as the reaction stops.
   5. Title: Add a suitable title to the graph, e.g., "Graph of Total Volume of Gas Produced vs. Time".

   (The provided image already shows a partially drawn graph. You need to complete plotting the points for 5, 6, and 7 minutes and extend the smooth curve accordingly. The curve should flatten out from 6 minutes onwards as the volume of gas becomes constant at 640 cm³).