[ 439 ] Physical Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • The table shows the maximum amount of oxygen gas that can be dissolved in water at various temperatures. Water Temperature (°C) Maximum Oxygen Solubility (mg/L) 0 14.6 10 11.3 20 9.2 30 7.6 40 6.4 100 0 Researchers find that a body of freshwater with an average temperature of 21°C has a dissolved oxygen concentration of 7.2 mg/L. What is a reasonable prediction of the water’s dissolved oxygen concentration after the population size of freshwater grasses doubles? A. 6.3 mg/L B. 7.2 mg/L C. 8.5 mg/L D. 14.4 mg/L A marathon runner consumes foods with a high carbohydrate content before and during a race to prevent muscle fatigue. This practice, called carb loading, supports which of the following energy transformations within the runner’s body? A. chemical to thermal B. thermal to kinetic C. kinetic to thermal D. chemical to kinetic