Chem1 Olympics

1
Chem1 Olympics

• CCDS
• Charlotte Country Day School

2
Which of the following expressions represents a
mixture?

• NH3(s)
• NH3(l)
• NH3(g)
• NH3(aq)

3

• D

4
A sample of Pure Water is Boiling at a
temperature of 95 oC. What is the most likely
explanation

• The Pressure is greater than 1.0 atm
• The Pressure is less than 1.0 atm
• The Water contains some dissolved Salt

5

• B

6
Which of the following units CANNOT be used to
express the Pressure of a gas or vapor?

• kPa
• atm
• mmHg
• kg

7

• D

8
A sample of gas occupies a volume of 240 mL at
pressure of 100 kPa. What volume will the gas
occupy at a pressure of 150 kPa?

• 120 mL
• 160 mL
• 240 mL
• 360 mL

9

• B

10
Which of the following electron configurations
corresponds to the ground state of a Halogen atom?

• 1s22s22p1
• 1s22s22p3
• 1s22s22p5
• 1s22s22p7

11

• C

12
Two atoms of the same element must have the same
number of which of the following?

• Protons only
• Neutrons only
• Protons and Neutrons
• Protons or Neutrons

13

• A

14
What is the correct chemical formula of Aluminum
Sulfate?

• AlSO4
• Al2SO4
• Al2(SO4)3
• Al3(SO4)2

15

• C

16
When a Calcium atom becomes a Calcium ion, it
does which of the following?

• Gains two protons
• Gains two electrons
• Loses two protons
• Loses two electrons

17

• D

18
When the equation H2 Fe2O3 ---gt Fe H2Ois
balanced using the smallest integers, what is the
coefficient of the Hydrogen

• 2
• 3
• 4
• 6

19

• B

20
Compounds with which of the following chemical
formulae contain a double bond?

• CH4
• C2H6
• C2H4
• C2H2

21

• C

22
The ?Hrxn for which of the following
reactions is equal to the - ?Hfo of Sulfur
Trioxide?

• S O3 ---gt SO3
• SO3 ---gt S 3 O
• SO3 ---gt S 3/2 O2
• H2SO4 ---gt H2O SO3

23

• C

24
A substance is very brittle with an extremely
high melting point. It does not dissolve in
Water and does not conduct an electric current.

• Molecular Covalent
• Network Covalent
• Ionic
• Metallic

25

• C

26
Which of the following statements is true for a
reaction that proceeds spontaneously at all
temperatures?

• ?Hrxn lt 0 and ?Srxn lt 0
• ?Hrxn lt 0 and ?Srxn gt 0
• ?Hrxn gt 0 and ?Srxn lt 0
• ?Hrxn gt 0 and ?Srxn gt 0

27

• B

28
The strongest intermolecular forces present in a
sample of liquid Hydrogen Chloride (HCl) are
which of the following?

• Van der Waals (Dispersion) Forces
• Dipole-Dipole Forces
• Hydrogen Bonds
• Ionic Bonds

29

• B

30
Which of the following solutions would have the
lowest freezing point?

• 0.10 M NaCl(aq)
• 0.20 M NaCl(aq)
• 0.20 M CaCl2(aq)
• 0.10 M AlCl3(aq)

31

• C

32
The vapor pressure of Methanol at 25 oC is
greater than the vapor pressure of Water at the
same temperature. Explain.

• Methanol has stronger IM Forces than Water
• Methanol has weaker IM Forces than Water
• Methanol has a higher boiling point than Water
• Methanol has a greater molecular weight than Water

33

• B

34
In the equilibrium reaction N2 O2 lt---gt 2 NO,
?Hrxn gt 0 which of the following changes will
increase the moles of N2 present?

• Increase the Temperature of the system
• Increase the Pressure of the system
• Add some O2 to the system at equilibrium
• Add some NO to the system at equilibrium

35

• D

36
All Isomers of a given molecular formula would
have the same value of which of the following
quantities?

• Boiling Point
• Density
• Formula Mass
• Vapor Pressure

37

• C

38
In a chemical reaction, adding a catalyst changes
which of the following?

• Decreases Eact
• Decreases ?Hrxn
• Increases Avg. KE of Particles
• Increases Keq

39

• A

40
Which of the following elements reacts most
violently with Water?

• Sodium
• Potassium
• Magnesium
• Copper

41

• B

42
Which of the following elements has the greatest
atomic radius?

• Nitrogen
• Oxygen
• Phosphorus

43

• C

44
All elements of the second Period of the periodic
table in the ground state have the same...

• Number of Protons
• Number of Valence Electrons
• Highest occupied shell
• Ionization Energy

45

• C

46
When a Copper wire is immersed in a solution of
Silver Nitrate, a reaction occurs. Which type of
reaction is this?

• Synthesis
• Decomposition
• Single Replacement
• Double Replacement

47

• C

48
In the reaction of Copper and Silver Nitrate
solution, the solution turns blue, indicating the
presence of Cu2 ion. Write the Overall Balanced
Equation for the Reaction.

• Cu(s) AgNO3(aq) ---gt CuNO3(aq) Ag(s)
• 2 Cu(s) AgNO3(aq) ---gt Cu2NO3(aq) Ag(s)
• 2 Cu(s) 2 AgNO3(aq) ---gt Cu2(NO3)2(aq) 2
  Ag(s)
• Cu(s) 2 AgNO3(aq) ---gt Cu(NO3)2(aq) 2 Ag(s)

49

• D

50
Hydrogen Bonding occurs in pure samples of all of
the following compounds EXCEPT

• CH4
• NH3
• H2O
• HF

51

• A

52
Samples of Carbon Dioxide and Helium have the
same mass at the same temperature and pressure.
The samples have...

• The same number of moles.
• The same volume.
• The same average velocity.
• The same average Kinetic Energy

53

• D

54
If a gas behaves as an ideal gas, it will have
all of the following EXCEPT...

• Particles of negligible volume
• Particles of negligible mass
• Elastic collisions between particles
• Negligible Intermolecular forces between particles

55

• B

56
6.00 g of Sodium Hydroxide NaOH, F. M. 40.0
g/mol is dissolved in enough Water to give 250.0
mL of solution. What is the NaOH?

• 0.0006 M
• 0.0240 M
• 0.150 M
• 0.600 M

57

• D

58
1.187 g of a compound composed of a Metal and
Oxygen, MxOy, is reacted, forming 1.054 g of pure
Metal. What is the formula of the compound?

• Ag2O
• K2O
• Cu2O
• Tl2O

59

• C

60
When solid Ammonium Nitrate, NH4NO3, is added to
Water, it dissolves spontaneously and the
temperature of the solution decreases. Which is
true about the dissolving process?

• ?Hrxn lt 0 and ?Srxn lt 0
• ?Hrxn lt 0 and ?Srxn gt 0
• ?Hrxn gt 0 and ?Srxn lt 0
• ?Hrxn gt 0 and ?Srxn gt 0

61

• D

62
An aqueous solution is measured and found to have
a pH 1.0. Which of the following statements is
true?

• H 1.0 M
• H lt OH-
• H OH-
• H gt OH-

63

• D

64
Which of the following compounds contains both
Ionic and Covalent bonds?

• H2O
• NaCl
• Na2O
• NaOH

65

• D

66
A chemical reaction in the gas phase is
Endothermic. Which of the following statements
about bond energy is true?

• The reactants have stronger bonds than the
  products
• The reactants have weaker bonds than the products

67

• A

68
How many valence electrons are present in the
Tetraborate Ion, B4O72-?

• 42
• 54
• 56
• 62

69

• C

70
A compound of Carbon and Sulfur is 15.8 Carbon
by mass. What is the empirical formula of the
compound?

• CS
• CS2
• C2S
• C2S3

71

• B

72
Which of the following molecules is non-polar?

• Hydrogen Chloride, HCl
• Water, H2O
• Ammonia, NH3
• Methane, CH4

73

• D

74
The first three ionization energies of element X
are 740 kJ/mol, 1450 kJ/mol, and 7730 kJ/mol.
What column(s) is the element?

• Alkali Metals
• Alkaline Earth Metals
• Transition Metals
• Halogens

75

• B

76
What is the Formula Mass of Sodium Sulfate?

• 55 g/mol
• 78 g/mol
• 119 g/mol
• 142 g/mol

77

• D

78
In an experiment to determine the rate of the
reaction H2 I2 ---gt 2 HI, which of the
following will increase the value of the rate
constant, k?

• Increasing the concentration of Hydrogen
• Increasing the concentration of Iodine
• Increasing the Pressure
• Increasing the Temperature

79

• D

80
Which of the following combinations of solutions
will NOT produce a precipitate?

• AgNO3(aq) NaCl(aq) ----gt
• Pb(NO3)2 (aq) KI(aq) ----gt
• CaCl2(aq) Na2CO3(aq) ----gt
• KNO3(aq) NaCl(aq) ----gt

81

• D

82
A compound has the empirical formula CHCl and a
formula mass of 290.8 g/mol. How many Carbon
atoms are in one molecule?

• 2
• 3
• 4
• 6

83

• D

84
Which of the following does NOT represent one
mole of Nitrogen gas?

• 14 grams
• 22.4 Liters _at_ STP
• 6.02 x 1023 molecules

85

• A

86
The combustion of 11.0 g of Propane(C3H8, F. M.
44.0 g/mol) releases 220 kJ of Heat. What is
the value of ?Hrxn?

• ?Hrxn -880 kJ/mol
• ?Hrxn -220 kJ/mol
• ?Hrxn 220 kJ/mol
• ?Hrxn 880 kJ/mol

87

• D

88
When cooled, Water changes to Ice at a
temperature of 0oC. What is true about the
energy of the molecules as the Water freezes?

• Potential and Kinetic energy are decreasing
• Potential energy is decreasing but Kinetic energy
  is constant
• Potential energy is decreasing but Kinetic energy
  is increasing
• Potential energy is increasing but Kinetic energy
  is decreasing

89

• B