[ 553 ] Physical Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • A chemistry student conducts an experiment in which he keeps the temperature and volume of a gas constant. He increases the amount of the gas and measures the pressure. The data are shown in the table. He creates a graph in his lab report and the teacher marks it wrong. 6 4 2 0 0 200 400 600 Pressure (kPa) Amount (mol) Which error did the student commit in making the graph? A. The x-axis is not graded in even increments. B. The y-axis is not graded in even increments. C. There should be no line through the data points. D. The variables are plotted on the wrong axes.