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Chemistry > Midterm Exam > Flashcards

Midterm Exam Flashcards

1
Q

What is 3,456 km expressed in scientific notation?

A

3.456 x 10³ km

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2
Q

How many significant figures are there in the measurement 0.000000345

A

three, don’t count leading zeros

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3
Q

What is the quantity 34.5 milligrams expressed in grams?

A

0.0345 g (move decimal 3 to left)

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4
Q

What is the purpose of using significant figures in the science lab?

A

to determine the precision of measurement

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5
Q

What is the easiest instrument to use to measure volume?

A

graduated cylinder

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6
Q

What is the quantity 340 meters expressed in kilometers?

A

0.34 km

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7
Q

What are important safety rules to follow when working with open flames?

A

Do not leave lighted burner unattended, tie back hair, avoid wearing loose clothing

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8
Q

Perform the following calculation to the correct number of significant figures. 2.00 cm x 0.0040 cm =

A

.0080 cm² (give answer in 2 sig figs, because least precise number had 2 sig figs)

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9
Q

What is an important safety rule to follow when working with an acid?

A

wear safety goggles

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10
Q

If an acid is spilled on your skin, you should tell the teacher and ___.

A

rinse thoroughly with water

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11
Q

Known mass is 4.40 g. Data was 2.20,2.21,2.20,2.21,2.20. The data reflects -

A

Low accuracy and high precision.

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12
Q

What type of change is tearing a piece of paper?

A

Physical change

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13
Q

What type of change is rusting?

A

Chemical change

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14
Q

What type of mixture is soil?

A

heterogeneous

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15
Q

What type of mixture is Kool-Aid?

A

homogeneous

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16
Q

What type of mixture is salt water?

A

homogeneous

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17
Q

What type of mixture is Gatorade?

A

homogeneous

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18
Q

What type of mixture is tossed salad?

A

heterogenous

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19
Q

What type of change is explosion?

A

chemical

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20
Q

What type of change is corrosion?

A

chemical

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21
Q

What type of change is food spoilage?

A

chemical

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22
Q

What type of change is boiling?

A

physical

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23
Q

What type of change is sublimation (solid to gas)?

A

physical

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24
Q

What type of change is dissolving in water?

A

physical

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25
Q

What type of mixture is raisin bread?

A

heterogenous

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26
Q

What type of mixture is sand and water?

A

heterogenous

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27
Q

What are some evidences that a chemical change has occurred?

A

Change in color, production of a gas, change in smell, change in temperature, a solid forms (precipitate)

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28
Q

When a change in state,(like liquid to gas or solid to liquid), occurs, is this evidence of a chemical change?

A

no

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29
Q

What mass of sodium chloride would be produced if 10 grams of sodium reacted completely with 20 grams of chlorine?

A

10 + 20 = 30 grams, due to Law of Conservation of Mass

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30
Q

What is each vertical column of the elements in the periodic table called?

A

group

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31
Q

What is each horizontal column of the elements in the periodic table called?

A

period

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32
Q

What state of matter has a definite volume and takes the shape of its container?

A

liquid

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33
Q

What state of matter has a definite volume and shape?

A

solid

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34
Q

What state of matter has no definite volume and no definite shape?

A

gas

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35
Q

What is the term describing the process of a gas changing to a solid?

A

deposition

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36
Q

What is the term describing the process of a solid changing to a gas?

A

sublimation

37
Q

The phase change from gas to liquid is called

A

condensation

38
Q

The phase change from solid to liquid is called

A

melting

39
Q

Where are the noble gases located?

A

Group 18

40
Q

Where are the transition metals located?

A

Groups 3-12

41
Q

Alkali metals are located in what group?

A

Group 1

42
Q

Alkaline earth metals are located in group?

A

Group 2

43
Q

How many neutrons are in Hydrogen-3

A

2 (Mass number 3 - Atomic number 1)

44
Q

How many protons, electrons and neutrons does an atom with atomic number 6 and mass number 14 contain?

A

protons - 6 (atomic # is # of protons) electrons - 6 (protons = electrons in neutral atom) neutrons - 8 (mass # 14 - atomic # 6 = 8 )

45
Q

What does the number 12 in carbon-12 represent?

A

the mass number

46
Q

What is the average atomic mass of the ¹⁴C at 1% and ¹²C at 99%?

A

12.02 amu

47
Q

Isotopes of elements have different ___

A

masses due to the different number of neutrons

48
Q

How many electrons are present in the 3d sublevel of an atom of copper?

A

9

49
Q

What element has the electron configuration of 1s²2s²2p⁶3s²3p³?

A

Phosphorus

50
Q

What is true of the electron configuration of the noble gases?

A

They have a full outer level.

51
Q

How many valence electrons are there in an atom of Nitrogen?

A

5 valence electrons

52
Q

How many electrons does nitrogen have to gain in order to become stable?

A

3 electrons

53
Q

What is the charge of a particle having 5 protons and 6 electrons?

A

-1

54
Q

Ions form when atoms gain or lose ___

A

electrons

55
Q

What is the charge on an ion from the halogen group?

A

-1

56
Q

When Group 2 elements form ions, they

A

lose 2 electrons

57
Q

The “s” orbital can hold how many electrons?

A

2

58
Q

The “d” block elements can also be called

A

transition metals

59
Q

Which of the following elements (Fr, Cs, Rb) have the smallest atomic radius?

A

Rb

60
Q

Which of the following elements (F, O, N) has the largest ionization energy?

A

F

61
Q

Which of the following elements (O, N, C ) has the largest electronegativity?

A

O

62
Q

Anions are, bigger or smaller ,than the neutral atom?

A

bigger

63
Q

Cations are, bigger or smaller, than the neutral atom?

A

smaller

64
Q

Which types of elements can be joined by a covalent bond?

A

nonmetal with nonmetal

65
Q

Which types of elements can be joined by an ionic bond?

A

metal with nonmetal

66
Q

Electrons are shared in which type of bond?

A

covalent

67
Q

Electrons are transferred (given or taken) in which type of bond?

A

ionic

68
Q

Which molecule (CCl₄, BaI₂, N₂O₄ )has a tetrahedral shape?

A

CCl₄ , 4 atoms around a central atom

69
Q

Which formulas (NaCl, CS₂, N₂O₄)represent an ionic compound?

A

NaCl, metal + nonmetal

70
Q

Which element (C, O, K) when combined with Cl would form on ionic compound?

A

K, metal with nonmetal

71
Q

What is the correct formula when Mg and Br bond?

A

Ionic: Mg²⁺ and Br⁻ make MgBr₂

72
Q

What is the correct formula of gallium oxalate?

A

Ionic: Ga³⁺ and C₂O₄²⁻ make Ga₂(Cr₂O₄)₃

73
Q

What is the usual charge on an ion from Group 5?

A

-3

74
Q

What shape does a water molecule have?

A

bent

75
Q

What shape does NH₃ have?

A

trigonal pyramidal

76
Q

What shape does CO₂ have?

A

linear

77
Q

Which family needs to gain one electron?

A

Halogens

78
Q

What is the correct chemical formula for nitrogen dioxide?

A

Covalent: NO₂

79
Q

What is the correct chemical formula for calcium phosphide?

A

Ionic: Ca²⁺ and P³⁻ make Ca₃P₂

80
Q

What is the correct name for C₂O₄?

A

Covalent: Dicarbon tetraoxide

81
Q

In the compound iron (II) oxide, what does the Roman numeral represent?

A

the charge of the iron atom

82
Q

What compound forms from the combination of strontium and oxygen?

A

Ionic: Sr²⁺ and O²⁻ make SrO

83
Q

The symbol for the hydroxide ion is

A

OH⁻

84
Q

What is the correct formula for magnesium hydroxide?

A

Ionic: Mg²⁺ and OH⁻ make Mg(OH)₂

85
Q

What is the name for CaBr₂

A

Ionic: Calcium bromide

86
Q

What is the name of KBr?

A

Ionic: Potassium bromide

87
Q

What is the name for Ca(NO₂)₂ ?

A

Ionic: Ca²⁺ and NO₂⁻ make calcium nitrite

88
Q

When naming covalent compounds ___ are used to indicate the number of atoms of each element.

A

prefixes

89
Q

What is the correct name for OF₆?

A

Covalent: Oxygen hexafluoride

Chemistry (11 decks)

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