9. What is the mass if 55.2 L of CO2 gas at STP? 10. How many grams are in 2.0 x 1056 atoms of Ca?

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Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

Modern weaponry has increased the number of deaths in wars and violent conflicts.