Question

1. Which of the following statements is true?

A. Only a few energy conversions are 100 percent efficient.
B. Friction between moving parts can add energy to a system.
C. Photosynthesis converts light energy into chemical energy.
D. Batteries change electricity into chemical energy.

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2. Which of the following statements is true?

A. Incandescent light bulbs are almost 100 percent efficient.
B. Heat is considered "lost" energy because it cannot be used for work.
C. An electric drill gains energy in the form of heat and sound.
D. Endothermic reactions release heat.

Answer 1

1)
1. batteries change electric energy into chemical energy.
2.Only a few energy conversions are 100 percent efficient.
2)
An electric drill gains energy in the form of heat and sound.

Answer 2

Answer:

D. Batteries change electricity into chemical energy.

B. Heat is considered "lost" energy because it cannot be used for work.

no offence, but the next time you want right answers- try re-reading and finding it out yourself instead of using the internet.