Chapter 2

Question 1

Which of the following particles are found in the nucleus of an atom?
A) protons and electrons
B) only protons
C) only electrons
E) protons and neutrons

Answer 1

E, Protons and neutrons

Question 2

Electrons move about the nucleus of an atom in the same way that

Answer 2

insects fly around a bright lamp at night

Question 3

The four most common elements on earth include carbon, oxygen, hydrogen and

Answer 3

Nitrogen

Question 4

What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons?

Answer 4

12

Question 5

An uncharged atom of manganese has an atomic number of 25 and an atomic mass of 55. How many electrons does manganese have?

Answer 5

25

Question 6

A sodium atom contains 11 electrons, 11 protons, and 12 neutrons. What is the atomic mass of sodium?

Answer 6

23

Question 7

Typically, nitrogen atoms are composed of electrons, protons, and neutrons. An isotope of nitrogen could

Answer 7

have more neutrons than the usual nitrogen atom

Question 8

compared to a solution with a pH of 9, a solution with a pH of 6 has

Answer 8

1,000 times more hydrogen ions

Question 9

In the equation CH4+202 -> CO2+2H2O, the CO2 and 2H2O molecules are _______ while the CH4 and 2O2 molecules are ______

Answer 9

products; reactants

Question 10

Compared with 13C, the radioactive isotope 14C has

Answer 10

One more neutron

Question 11

Which of the following pairs is mismatched?
A) anabolic reaction- synthesis of a large molecule from two small ones
B) hydrophilic- another name for a polar compound
C) buffer- chemical that resists changes in the pH of a solution
D) Basic- a solution that contains more H+ than OH

Answer 11

D, Basic- a solution that contains more H+ than OH

Question 12

Water’s high surface tension allows it to do what?
A) it gives water the ability to circulate upward on and through objects
B) it does non of these
C) it gives water the ability to bead on objects
D) it gives water a “sticky” property
E) it does all of the above

Answer 12

E, It does all of the above

Question 13

What type of bond is joining the two hydrogen atoms? (hint: are these atoms transferring or sharing electrons?)

Answer 13

Covalent

Question 14

A single water molecule (H-O-H) is held together by

Answer 14

Two polar covalent bonds

Question 15

Water has an unusually high specific heat. What does this mean?

Answer 15

More heat is required to raise the temperature of water

Question 16

Water shows high cohesion and surface tension and can absorb large amounts of heat because of large numbers of which of the following bonds between water molecules?
A) hydrogen bonds
B) strong ionic bonds
C) polar covalent bonds
D) weak ionic bonds
E) nonpolar covalent bonds

Answer 16

A, hydrogen bonds

Question 17

how many electrons can be in the first shell

Answer 17

2

Question 18

how many electrons can be in the second shell

Answer 18

8