Photosynthesis must occur for plants to survive. Which of the following best explains why photosynthesis is necessary? A. Photosynthesis produces the water that plants need to survive. B. Photosynthesis releases carbon dioxide as a waste product. C. Photosynthesis allows plants to use the energy stored in food. D. Photosynthesis produces the food that plants use to grow.

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.