Chapter 2

01. The mass of a quantity of a substance is: a) determined only by its resistance to acceleration b) identical with its weight c) 1/6 as great on the surface of the moon as on the surface of the earth d) determined only by the number of atoms it contains e) determined only by its volume

a) determined only by its resistance to acceleration

03. If a person with a mass of 150 lbs on earth were to travel to the moon, the mass of this same person on the surface of the moon would be: a) 150 lbs b) 900 lbs c) 60 lbs d) 25 lbs e) 15 lbs

a) 150 lbs

17. The number written to the lower left of an atomic symbol represents the: a) atomic number b) atomic mass c) sum of protons and neutrons d) number of quantum shells e) number of nuclear neutrons

a) atomic number

24. The mass of the electrons surrounding an atomic nucleus is not ordinarily considered in determining the mass of an atom because: a) the mass of an electron is only about 1/2000 the mass of a proton and is therefore negligible in comparison b) no electrons exist in an atomic nucleus c) the sum of all the electrons in an atom always amounts to the mass of one proton d) electrons are important only in determining the masses of isotopes e) the value of an electron's mass is incorporated into the mass of a proton.

a) the mass of an electron is only about 1/2000 the mass of a proton and is therefore negligible in comparison

19. We can write the symbol for a typical fluorine atom as (redacted) The superscript 19 in this symbol represents: a) the sum of all the protons and all the neutrons in the fluorine atom b) the number of protons in the fluorine atom's nucleus c) the number of neutrons in the fluorine atoms's nucleus d) the number of electrons in the atom's outermost shell e) the total number of electron shells in the fluorine atom

a) the sum of all the protons and all the neutrons in the fluorine atom

21. To determine the number of neutrons in any particular isotope, use: a) (mass number + atomic number) b) (mass number - atomic number) c) (atomic number - mass number) d) (atomic number - ½ mass number) e) (atomic number + ½ mass number)

b) (mass number - atomic number)

15. The mass of a proton is: a) 1 g b) 1 amu c) 6.02 x 10 23 g d) 6.02 x 10 23 amu e) 3.3 x 10 -22 amu

b) 1 amu

38. The maximum number of electrons that can occupy the first quantum shell is: a) 1 b) 2 c) 4 d) 6 e) 8

b) 2

07. Two atoms must represent the same element if they both have the same: a) number of electron shells b) atomic number c) number of neutrons in their nuclei d) atomic mass e) number of electrons in their outermost shells

b) atomic number

18. The atomic number of an atom is the sum of all of its: a) neutrons b) protons c) valence electrons d) isotopes e) neutrons plus protons

b) protons

20. The subscript 9 in the symbol 1 9 9 F represents: a) the mass of the fluorine atom, in amu b) the number of protons in the fluorine atom's nucleus c) the number of neutrons in the fluorine atoms's nucleus d) the number of electrons in the atom's outermost shell e) The total number of electron shells in the fluorine atom

b) the number of protons in the fluorine atom's nucleus

23. Instead of using names (such as "hydrogen" or "nitrogen") or symbols (such as "H" or "N") to represent elements, we could represent elements uniquely by: a) their atomic weights b) their atomic numbers c) the number of electrons in their outermost shells d) the number of electron shells surrounding their nuclei e) the number of neutrons in their nuclei.

b) their atomic numbers

16. One amu is approximately equal to: a) 1 g b) 1 x 10 -3 g c) 1.7 x 10 -24 g d) 6.02 x 10 23 g e) 1 microgram

c) 1.7 x 10 -24 g

13. The mass of an atom of gold (symbol Au) is: a) 197 g b) 1 amu c) 3.3 x 10 -22 g d) 1 g e) 197 x 10 23g

c) 3.3 x 10 -22g

09. A proton has: a) a mass of one amu and a charge of zero b) a mass of zero amu and a charge of +1 c) a mass of one amu and a charge of +1 d) a mass of zero amu and a charge of zero e) a mass 1/2000 that of the electron

c) a mass of one amu and a charge of +1

10. Of the following, the particle that carries no electrical charge is: a) an electron b) a proton c) a neutron d) a cation e) an anion

c) a neutron

08. The statement among the following that is FALSE is: a) a proton has a mass of 1 amu and carries a positive charge b) an electron has a mass of about zero amu and carries one negative charge c) a neutron has a mass of about zero amu and carries no electrical charge d) the mass of an electron is 0.0009 x 10-24 grams e) the mass of a proton is 1.67 x 10 -24 grams.

c) a neutron has a mass of about zero amu and carries no electrical charge

12. The element that's used to define the atomic mass unit (amu) is: a) hydrogen b) helium c) carbon d) oxygen e) lithium

c) carbon

04. A pure substance that cannot be decomposed or converted into simpler substance by the action of heat, light, magnetism, kinetic energy, sound, electricity, or any of the other common forces of our everyday world is considered to be a(n): a) ionic compound b) diatomic molecule c) element d) electrolyte e) covalent compound

c) element

25. The atomic number of an atom is the same as the number of: a) electrons in its first shell b) electrons in its outermost shell c) protons in its nucleus d) neutrons in its nucleus e) protons plus neutrons in its nucleus.

c) protons in its nucleus

02. If a person who weighs 150 lbs on the earth were weighed on the surface of the moon, the scale on the moon would show a weight of: a) 150 lbs b) 900 lbs c) 60 lbs d) 25 lbs e) 15 lbs

d) 25 lbs

22. The atomic number of a certain atom is 14. The number of electrons in the outermost shell of this atom is: a) 1 b) 2 c) 3 d) 4 e) 5

d) 4

39. The maximum number of electrons that can occupy the second quantum shell is: a) 2 b) 4 c) 6 d) 8 e) 10

d) 8

06. The smallest, electrically neutral particle of an element that can be identified as that element is: a) a proton b) a neutron c) a molecule d) an atom e) an electron

d) an atom

05. The origin or original meaning of the word "atom" reflects the belief that atoms: a) consist of a nucleus and surrounding electron shells b) are composed of protons, neutrons and electrons c) combine to form compounds d) can be assigned both atomic numbers and mass numbers e) cannot be split into smaller fragments

e) cannot be split into smaller fragments

14. Of the following, the atom with the smallest diameter is: a) gold b) sodium c) lithium d) cesium e) helium

e) helium

11. Almost all of the mass of an atom exists in its: a) first quantum shell b) outermost electron shell c) combined electron shells d) electrons e) nucleus

e) nucleus