Ch. 2 Quiz

Question 1

Which of the following are compounds?
A) H2O, O2, and CH4
B) H2O and O2
C) O2 and CH4
D) H2O and CH4, but not O2
E) H20 and CH4 and N2

Answer 1

D

Question 2

Magnesium has an atomic number of 12. What is the most stable charge for a magnesium ion?

Answer 2

+2 charge

Question 3

The nucleus of a nitrogen atom contains 7 neutrons and 7 protons. Which of the following is a correct statement regarding nitrogen?

A) the nitrogen atom has a mass number of approximately 7 daltons an an atomic mass of 14
B) the nitrogen atom has a mass number of approximately 14 daltons and an atomic mass of 7
C) the nitrogen atom has a mass number of 14 and an atomic mass of 7 grams
D) the nitrogen atom has a mass number of 7 and an atomic number of 14
E) the nitrogen atom has a mass number of 14 and an atomic mass of approximately 14 daltons

Answer 3

E) The nitrogen atom had a mass number of 14 and an atomic mass of approximately 14 daltons

Question 4

Electrons exist only at fixed levels of potential energy. However, if an atom absorbs sufficient energy, a possible result is that…

Answer 4

An electron may move to an electron shell farther away from the nucleus

Question 5

Which of the following is true for this reaction?

3 H2 + N2 2 NH3

Answer 5

Ammonia is being formed and decomposed simultaneously

Question 6

Bonds between two atoms that are equally electronegative are

Answer 6

Nonpolar covalent bonds

Question 7

A covalent chemical bond is one in which

Answer 7

Outer-shell electrons of two atoms are shared so as to satisfactorily fill their respective orbitals

Question 8

How many electrons will a single atom of sulfur with no charge and no bonds have in its valence shell?

Answer 8

6