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Chemistry Fall 24' > Chem Exam 1 > Flashcards

Chem Exam 1 Flashcards

1
Q

Which of the following represents a physical property?
* Methane gas is highly flammable
* Copper metal has a tendency to “rust”
* Mercury is a silvery liquid at room temperature
* Neon gas has an unreactive nature
* Sodium metal reacts violently with chlorine gas

A

Mercury is a silvery liquid at room temperature

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2
Q

A physical change:
* occurs when your body converts glucose into energy
* occurs when an egg is cooked
* occurs when water is cooled to ice
* occurs when sugar is heated into caramel
* occurs when natural gas is burned for heat

A

occurs when water is cooled to ice

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3
Q

Identify the pure substance from the following:
* carbon dioxide
* orange juice
* coffee
* salt water
* green bean casserole

A
  • carbon dioxide
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4
Q

How many total electrons can be housed in the 3d-orbitals?
* 10
* 4
* 6
* 2
* 14

A

10

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5
Q

How many valence electrons does calcium have?
* 1
* 18
* 20
* 2
* 8
* 0
* 6

A

2

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6
Q

How many core electrons does calcium have?
* 20
* 0
* 1
* 18
* 8
* 2
* 7

A
  • 18
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7
Q

All atoms of a given element have the same ________.

  • number of neutrons
  • number of electrons and neutrons
  • mass
  • number of protons
  • density
A
  • number of protons
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8
Q

Which of the following is the proper electron configuration for calcium?
* 1s2,2s2,2p6,3s2,3p8
* 1s2,2s2,2p6,3s2,3p6,4s2
* 1s2,2s2,2p6,3s2,3p6,4s2,4p2
* 1s2,2s2,2p6,3s2,3p6

A
  • 1s2,2s2,2p6,3s2,3p6,4s2
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9
Q

How many electrons does the Ca2+ ion possess?
* 18
* 4
* 8
* 22
* 20
* 10

A
  • 18
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10
Q

Which of the following is the proper electron configuration for the Ca2+ ion?

  • 1s2,2s2,2p6,3s2,3p6
  • 1s2,2s2,2p6,3s2,3p6,4s2
  • 1s2,2s2,2p6,3s2,3p6,4s2,4p2
  • 1s2,2s2,2p6,3p6,4s2
A
  • 1s2,2s2,2p6,3s2,3p6
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11
Q

Which of the following sets have species containing the same number of electrons?
* Mg2+, Sr2+, Ba2+
* Br, Br-, Br+
* Cl-, Ar, Ca2+
* C, N3-, O2-

A
  • Cl-, Ar, Ca2+
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12
Q

Identify the compound with covalent bonds
* Kr
* KCl
* CH4
* Na
* NaBr

A
  • CH4
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13
Q

What is the empirical formula for C16H32O8?
* CH2O
* C2H4O
* CHO
* CHO3
* C2H5O

A
  • C2H4O
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14
Q

What is the charge on the Fe ions in Fe2O3?

  • 1+
  • 3-
  • 2-
  • 4-
  • 3+
A
  • 3+
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15
Q

Write the formula for the compound formed between potassium and selenium.

  • K2Se
  • K2Se3
  • KSe
  • K3Se3
  • KSe2
A
  • K2Se
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16
Q

Write the name for Sn(SO4)2.

  • tin(II) sulfate
  • tin sulfide
  • tin(IV) sulfate
  • tin(I) sulfite
  • tin(II) sulfite
A
  • tin(IV) sulfate
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17
Q

Give the name for MnO2
* manganese oxide
* manganese(IV) oxide
* manganese(IV) oxide
* manganese(II) oxide
* magnesium oxide
* manganese dioxide

A
  • manganese(IV) oxide
18
Q

Determine the name for N2O5.

  • nitrogen(II) oxide
  • nitrogen dioxide
  • nitrogen(V) oxide
  • dinitrogen pentoxide
  • dinitrogen oxide
A
  • dinitrogen pentoxide
19
Q

Give the formula for lithium dichromate.

  • Li2CrO4
  • Li2CrO3
  • Li2Cr2O7
  • LiCr3O7
  • Li2Cr2O5
20
Q

Which of the following is the formula for lead (IV) sulfide?

  • Pb2S4
  • PbS
  • PbS2
  • Pb2S
  • Pb4S
  • PbSO4
  • PbS4
21
Q

Place the following elements in order of decreasing atomic size.
* In Rb Xe Sr
* Rb > Sr > In > Xe
* In > Xe > Sr > Rb
* Xe > In > Sr > Rb
* Sr > Rb > Xe > In
* Rb > Sr > Xe > In
* Rb > Sr > In > Xe

A
  • Rb > Sr > In > Xe
22
Q

Choose the best Lewis structure for XeI2.

23
Q

Give the electron geometry (EG) and molecular geometry (MG) for XeI2
Give the electron geometry (EG) and molecular geometry (MG) for XeI2
* EG = Trigonal Bipyramidal
* MG = Trigonal Bipyramidal

  • EG = Trigonal Planar
  • MG = Bent
  • EG = Trigonal Bipyramidal
  • MG = Linear
  • EG = Tetrahedral
  • MG = Bent
  • EG = Linear
  • MG = Linear
A
  • EG = Trigonal Bipyramidal
  • MG = Linear
24
Q

Choose the best Lewis structure for the carbonate ion.

25
Q

Which of the following angles are present in XeI2? (Select all that apply)

  • 120
  • 90
  • 180
  • <120
  • 109.5
  • <109.5
26
Q

Give the electron geometry (EG) and molecular geometry (MG) for the carbonate ion.
* EG = tetrahedral
* MG = bent

  • EG = trigonal planar
  • MG = trigonal planar
  • EG = Tetrahedral
  • MG = Trigonal pyramidal
  • EG = trigonal planar
  • MG = bent
A
  • EG = trigonal planar
  • MG = trigonal planar
27
Q

The carbon in the carbonate ion has which of the following formal charges?
* 0
* -1
* +2
* +1

28
Q

Which of the following bonding angles are present in the carbonate ion? (Select all that apply)

  • <109.5
  • 90
  • 180
  • 109.5
  • <120
  • 120
29
Q

Choose the best Lewis structure for the chlorate ion.

30
Q

Give the electron geometry (eg) and molecular geometry (mg) for the chlorate ion.
* EG = Trigonal Planar
* MG = Trigonal Planar

  • EG = Trigonal Planar
  • MG = Bent
  • EG = Tetrahedral
  • MG = Trigonal Pyramidal
  • EG = Tetrahedral
  • MG = Tetrahedral
  • EG = Tetrahedral
  • MG = Bent
A
  • EG = Tetrahedral
  • MG = Trigonal Pyramidal
31
Q

The chlorine atom in the chlorate ion has which of the following charges?

  • 0
  • +2
  • +1
  • -1
32
Q

Which of the following bonding angles is found in the chlorate ion? (Select all that apply)
* <109.5
* 180
* <120
* 120
* 90
* 109.5

A

Only <109.5

33
Q

Consider the molecule below. Determine the molecular geometry at each of the 3 labeled atoms.
* 1 = tetrahedral, 2 = tetrahedral, 3 = tetrahedral
* 1 = trigonal planar, 2 = tetrahedral, 3 = tetrahedral
* 1 = tetrahedral, 2 = tetrahedral, 3 = trigonal planar
* 1 = trigonal planar, 2 = trigonal pyramidal, 3 = trigonal pyramidal

  • 1 = trigonal planar, 2 = tetrahedral, 3 = trigonal pyramidal
A
  • 1 = trigonal planar, 2 = tetrahedral, 3 = trigonal pyramidal
34
Q

Iodine-131 is an isotope of iodine that is used to diagnose and treat thyroid cancers. If this isotope has a mass number of 131, how many protons, neutrons, and electrons are present in Iodine-131?
* Protons - 78
* Neutrons - 53
* Electrons - 78

  • Protons - 53
  • Neutrons - 78
  • Electrons – 53
  • Protons - 53
  • Neutrons -53
  • Electrons - 53
  • Protons - 53
  • Neutrons - 53
  • Electrons - 78
  • Protons - 53
  • Neutrons - 78
  • Electrons - 78
A
  • Correct answer:
  • Protons - 53
  • Neutrons - 78
  • Electrons – 53
35
Q

The tetrafluoroborate ion has a chemical formula of BF4-. What is the formal charge of the boron atom in this ion?
* +1
* -2
* 0
* -1
* +2

36
Q

The correct name for Ni(CN)2 is ________.
* nickel carbonate
* nickel cyanate
* nickel (II) cyanide
* nickel (I) cyanide
* nickel (I) nitride

A
  • nickel (II) cyanide
37
Q

Which compounds do not have the same empirical formula?
* C2H4O2, C6H12O6
* C2H5COOCH3, CH3CHO
* CO, CO2
* C2H2, C6H6
* C2H4, C3H6

38
Q

The correct name for NaHCO3 is ________.
* sodium hydride
* sodium bicarbonate
* persodium hydroxide
* persodium carbonate
* carbonic acid

A
  • sodium bicarbonate
39
Q

Which isotope has 45 neutrons? The top number is the mass number and the bottom is the atomic number.

40
Q

The type of compound that is most likely to contain a covalent bond is ________.
* There is no general rule to predict covalency in bonds.
* held together by the electrostatic forces between oppositely charged ions
* a solid metal
* one that is composed of only nonmetals
* one that is composed of a metal from the far left of the periodic table and a nonmetal from
* the far right of the periodic table

A
  • one that is composed of only nonmetals

Chemistry Fall 24' (7 decks)

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