[ 471 ] Physical Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • According to this passage, what does the phrase combination reaction mean? The change in the average kinetic energy of gas molecules vs. absolute temperature 12 10 8 6 4 2 0 0 100 200 300 400 500 Absolute Temp (K) Complete the following statements using the choices that follow. • In this graph, the numbers on the horizontal (right-to- left), or x-axis, represent the ____________. • In this graph, the numbers on the vertical (down-to-up), or y-axis, represent the ___________. • temperature in degrees Kelvin (K) • average kinetic energy (KE) of gas molecules Average KE (10 21 J)