1- A car engine's cooling system con- tains 20.0 L of water (1 L of water has a mass of 1 kg).
a. What is the change in the temperature of the
water if 836.0 kJ of thermal energy is added?
b. Suppose that it is winter, and the car's cooling
system is filled with methanol. The density of
methanol is 0.80 g/cm². What would be the
increase in temperature of the methanol if it
absorbed 836.0 kJ of thermal energy?
c. Which coolant, water or methanol, would better
remove thermal energy from a car's engine?
Explain.

What are chlorofluorocarbons and what impact do they have on the atmosphere?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

Which are advantages of renewable resources? check all that apply. renewable energy supplies are completely reliable everywhere. some renewable resources will never be used up. little or no waste is produced by renewable resource plants. electricity can be generated in large quantities. many renewable energy facilities have lower operating costs.