What is the first law of thermodynamics also known as?
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A. The law of conservation of mass
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B. The law of conservation of energy
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C. The law of conservation of heat
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D. The law of conservation of matter

The electromagnetic force acts between what

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound