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Chemistry > Atoms and Molecules > Flashcards

Atoms and Molecules Flashcards

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1
Q

The symbols for elements with accepted names

Select one:

a. consist of a single capital letter.
b. consist of a capital and a small letter.
c. consist of either a single capital letter or a capital letter and a small letter.

A

c. consist of either a single capital letter or a capital letter and a small letter.

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2
Q

A molecular formula

Select one:

a. is represented by the symbols of the elements in the formula.
b. is represented by a system of circles that contain different symbols.
c. cannot be represented conveniently using symbols for the elements.
d. is represented using words rather than symbols.

A

a. is represented by the symbols of the elements in the formula.

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3
Q

What is meant when the symbol C-12 is used?

Select one:

a. the carbon atom weighs 12 grams
b. the carbon atom weights 12 pounds
c. the carbon atom weighs 12 amu
d. the melting point of carbon is 12oC

A

c. the carbon atom weighs 12 amu

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4
Q

Refer to a periodic table and tell how many helium atoms (He) would be needed to get close to the same mass as an average oxygen atom (O).

Select one:

a. six
b. four
c. twelve
d. one-fourth

A

b. four

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5
Q

Which of the following pairs are about equal in mass?

Select one:

a. proton and electron
b. electron and neutron
c. proton and neutron
d. nucleus and surrounding electrons

A

c. proton and neutron

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6
Q

Which of the following carries a negative charge?

Select one:

a. protons
b. neutrons
c. electrons
d. nucleus

A

c. electrons

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7
Q

Which of the following is located in the nucleus of an atom?

Select one:

a. protons
b. neutrons
c. electrons
d. both protons and neutrons

A

d. both protons and neutrons

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8
Q

Determine the molecular weight of hydrogen peroxide, H2O2, in u.

Select one:

a. 17.01
b. 18.02
c. 34.02
d. 33.01

A

c. 34.02

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9
Q

Using whole numbers, determine the molecular weight of calcium hydroxide, Ca(OH)2.

Select one:

a. 56
b. 57
c. 58
d. 74

A

d. 74

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10
Q

Atoms that have the same atomic number but differ by mass number are called

Select one:

a. protons.
b. neutrons.
c. isotopes.
d. positrons.

A

c. isotopes.

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11
Q

Atoms are neutral. How can they have no charge?

Select one:

a. equal numbers of protons and neutrons
b. equal numbers of protons and electrons
c. equal numbers of neutrons and electrons
d. any charge has been drained out of the atom

A

b. equal numbers of protons and electrons

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12
Q

How many protons are found in the nucleus of a boron-11 (B) atom?

Select one:

a. 11
b. 6
c. 5
d. 4

A

c. 5

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13
Q

What is the mass number of a carbon-13 (C) atom?

Select one:

a. 13
b. 12
c. 6
d. 7

A

a. 13

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14
Q

What mass of arsenic (As) in grams contains the same number of atoms as 39.95 g of argon (Ar)?

Select one:

a. 33.0
b. 74.92
c. 4.16
d. 149.84

A

b. 74.92

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15
Q

The formula for dinitrogen monoxide is N2O. If a sample of the oxide was found to contain 0.0800 g of oxygen, how many grams of nitrogen would it contain?

Select one:

a. 0.140
b. 0.280
c. 0.560
d. 0.0700

A

a. 0.140

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16
Q

How many neutrons are found in the nucleus of a boron -11 (B) atom?

Select one:

a. 11
b. 6
c. 5
d. 4

A

b. 6

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17
Q

Naturally occurring neon (Ne) has the following isotopic composition (the mass of each isotope is given in parentheses). Calculate the atomic weight of neon in amu from these data. Neon-20, 90.92% (19.99 amu); neon-21, 0.257% (20.99 amu); neon-22, 8.82% (21.99 amu).

Select one:

a. 28.97
b. 37.62
c. 2017
d. 20.17

A

d. 20.17

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18
Q

The formula of nitrous oxide is N2O. If a sample of the oxide was found to contain 0.800 g of oxygen, how many grams of nitrogen would it contain?

Select one:

a. 0.140
b. 0.280
c. 0.560
d. 0.0700

A

a. 0.140

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19
Q

Avogadro’s number of iron (Fe) atoms would weigh

Select one:

a. 55.9 g
b. 27.9 g
c. 6.02 X 10^23 g
d. 6.02 X 10^-23 g

A

a. 55.9 g

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20
Q 
How many nitrogen atoms are in one mole of N2O?
Select one:
a. 1
b. 2 
c. 6.02 x 10^23
d. 12.04 x 10^23
A

d. 12.04 x 1023

21
Q

How many moles of oxygen atoms are in one mole of CO2?

Select one:

a. 1
b. 2
c. 6.02 X 10^23
d. 12.04 X 10^23

A

b. 2

22
Q

How many hydrogen atoms are in 1.00 mole of NH3?

Select one:

a. 3
b. 6.02 X 10^23
c. 12.04 X 10^23
d. 18.06 X 10^23

A

d. 18.06 X 1023

23
Q

How many moles of hydrogen molecules (H2) would be required to produce two moles of hydrogen peroxide (H2O2)?

Select one:

a. 1
b. 2
c. 3
d. 4

A

b. 2

24
Q

Calculate the weight percentage of hydrogen in water.

Select one:

a. 33.3
b. 66.7
c. 2.00
d. 11.1

A

d. 11.1

25
Q

The weight % of S in K2SO4 is

Select one:

a. 14.2%
b. 18.4%
c. 54.4%
d. 22.4%

A

b. 18.4%

26
Q

Which of the following elements is found in the same periodic table period as Sn?

Select one:

a. Si
b. As
c. Te
d. Dy

A

c. Te

27
Q

Which element is the first one in group IVA of the periodic table?

Select one:

a. C
b. Na
c. Sc
d. Ti

A

a. C

28
Q

What is the symbol of the element that is in Period 4 and Group IIA of the periodic table?

Select one:

a. Zn
b. Ca
c. C
d. Ti

A

b. Ca

29
Q

Silver, Ag, belongs to what period of the periodic table?

Select one:

a. IB
b. 2
c. 5
d. 12

A

c. 5

30
Q

Which of the following choices is a possible designation for an electron that occupies a volume around the nucleus that has the given shape? (CLOVER)

Select one:

a. 2p
b. 3s
c. 3d
d. 4f

A

c. 3d

31
Q

Which of the following subshells has the higher energy?

Select one:

a. 4s
b. 4p
c. 4d
d. 4f

A

d. 4f

32
Q

The total number of f orbitals in an f subshell is

Select one:

a. 2.
b. 11.
c. 7.
d. 10.

A

c. 7.

33
Q

The maximum number of electrons that can occupy a 3d subshell is

Select one:

a. 2.
b. 4.
c. 6.
d. 10.

A

d. 10.

34
Q

The maximum number of electrons that can occupy a 4p subshell is

Select one:

a. 2.
b. 4.
c. 6.
d. 10.

A

c. 6.

35
Q

What is the maximum number of electrons that can occupy the third shell?

Select one:

a. 2
b. 10
c. 18
d. 32

A

c. 18

36
Q

Which of the following elements should have properties similar to those of nitrogen (element 7)?

Select one:

a. C
b. Si
c. P
d. O

A

c. P

37
Q

Which of the following has the same number of outer shell electrons as sulfur, S?

Select one:

a. C
b. O
c. N
d. F

A

b. O

38
Q

Which of the following pairs have the same number of electrons in the outermost shell?

Select one:

a. K and Ca
b. S4+ and Al3+
c. Na+ and Ne
d. Ne and He

A

c. Na+ and Ne

39
Q

The melting point of oxygen is __________ selenium, Se.

Select one:

a. lower than
b. higher than
c. equal to
d. inverted from

A

a. lower than

40
Q

What is the n value for the outer shell electrons of bromine, Br?

Select one:

a. 4
b. 3
c. 5
d. 6

A

a. 4

41
Q

Which of the following elements has an electronic configuration of 1s2 2s2 2p6 3s2 3p1?

Select one:

a. F
b. Al
c. Mg
d. Ga

A

b. Al

42
Q

The total number of unpaired electrons in silicon (Si) is

Select one:

a. 0
b. 1
c. 2
d. 3

A

c. 2

43
Q

Which of the following contains the same total number of unpaired electrons as potassium (K)?

Select one:

a. Sc
b. Cl
c. Mg
d. More than one response is correct

A

d. More than one response is correct

44
Q

The electronic configuration of element 15 ends with

Select one:

a. 2p3
b. 3p5
c. 2p5
d. 3p3

A

d. 3p3

45
Q

How many electrons are in the outer shell of element 15?

Select one:

a. 5
b. 3
c. 15
d. 2

A

a. 5

46
Q

What type of electron is the distinguishing electron is S?

Select one:

a. s
b. p
c. d
d. f

A

b. p

47
Q

Which of the following distinguishing electrons represents an element with the properties similar to an element with a 3p3 distinguishing electron?

Select one:

a. 4p3
b. 3p2
c. 3d3
d. 2p2

A

a. 4p3

48
Q

Which element is represented by the distinguishing electron configuration 5d9?

Select one:

a. Pd
b. Ag
c. Pt
d. Au

A

d. Au

49
Q

Which of the following elements is most likely to be a metalloid?

Select one:

a. Ge
b. Mo
c. S
d. Cs

A

a. Ge

Chemistry (8 decks)

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