The mass of an electron is 9.11

*

*

10

-31

-31

kg.

1)

How far apart would two electrons have to be in order for the electric force exerted by each on the other to be equal to the weight of an electron? (Express your answer to three significant figures.)

Carbon can react with oxygen to form carbon dioxide. Which of the following statements about this chemical change is true. A. Carbon and oxygen atoms change into atoms of carbon dioxide B.

What is density of a 36g object with a volume of 15

3. Which is an example of a safe laboratory procedure? A eating or drinking in the laboratory B tying back long hair and loose clothing C identifying an odor by inhaling vapor D handling hot objects with your hands Answer: tying back long hair and

Match the following molecules with the number of atoms they contain. 1. 2Fe 2. 2Al3O2 3. 4O2 4. 5C 5. H2SO4 Answers to the question 2 5 7 8 10

Which expressions correctly represent variations of Ohm's law? Check all that apply.

Which of these are considered an oxidizing mutagenic agent? x-rays benzopyrene gamma rays

5. A B note has a frequency of 493.88 Hz. Calculate its wavelength in meters.

When one of the electrons of a particular atom undergoes a transition to a quantum state of lower energy, it a) collides with another of its electrons b) exchanges quantum states with another of its electrons c) undergoes a transition to a quantum

What's the symbol for an ionized bromine atom?

What is the hottest layer in the Sun's atmosphere?