Questions from General Chemistry

Q: Calculate the number of moles of the indicated substance present in each

Calculate the number of moles of the indicated substance present in each of the following samples. a. 47.2 g of aluminum oxide b. 1.34 kg of potassium bromide c. 521 mg of germanium d. 56.2 µg of...

Q: Why are petroleum products especially useful as sources of energy?

Why are petroleum products especially useful as sources of energy?

Q: Why is the “quality” of energy decreasing in the universe

Why is the “quality” of energy decreasing in the universe?

Q: What experimental evidence about a new compound must be known before its

What experimental evidence about a new compound must be known before its formula can be determined?

Q: Explain to a friend who has not yet taken a chemistry course

Explain to a friend who has not yet taken a chemistry course what is meant by the empirical formula of a compound.

Q: Give the empirical formula that corresponds to each of the following molecular

Give the empirical formula that corresponds to each of the following molecular formulas. a. sodium peroxide, Na2O2 b. terephthalic acid, C8H6O4 c. phenobarbital, C12H12N2O3 d. 1,4-dichloro-2-buten...

Q: Which of the following pairs of compounds have the same empirical formula

Which of the following pairs of compounds have the same empirical formula? a. acetylene, C2H2, and benzene, C6H6 b. ethane, C2H6, and butane, C4H10 c. nitrogen dioxide, NO2, and dinitrogen tetroxid...

Q: What are the four “stages” of coal formation? How

What are the four “stages” of coal formation? How do the four types of coal differ?

Q: Are the following processes exothermic or endothermic? a. When

Are the following processes exothermic or endothermic? a. When solid KBr is dissolved in water, the solution gets colder. b. Natural gas (CH4) is burned in a furnace. c. When concentrated sulfuric...

Q: A is some factor that tends to make a process occur.

A is some factor that tends to make a process occur.