Chem T Jeopardy
Classification of
Matter
Phys./ Chemical
Properties and
Changes
Molar
conversions
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Final Jeopardy
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©Norman Herr, 2003
A-100
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•
QUESTION: If the instructions on a drink says to shake before drinking, what can you
conclude about the mixture inside? Is it a solution, a suspension, or a homogeneous
mixture?
ANSWER: Suspension
A-200
• QUESTION: Define compound and give an
example.
• ANSWER: Atoms of two or more different
elements that combine chemically in fixed
ratios. Ex: NaCl
A-300
• QUESTION: Classify the following as solution,
suspension or colloid. Explain your answers!
– Oil and water
– Jell-o
– Orange soda
– Fog
– Alcohol and water
– Oil- based paint (that settles out when left
undisturbed)
• ANSWER: Suspension, colloid, solution,
colloid, solution, suspension
A-400
• QUESTION: Classify the following as
elements or compounds:
– CO
– Ag
–C
– NH3
• ANSWER: Compound, element, element,
compound
A-500
• QUESTION: What is the Tyndall Effect?
Describe a scenario where you may see
this effect and why you can see it.
• ANSWER: The scattering and reflection of
light by tiny solid particles suspended in a
liquid (or tiny liquid particles suspended in
a gas). If you shine a light through a
colloid, such as fog, the beam will be
visible due to the Tyndall Effect.
B-100
• QUESTION: Breaking glass is an example of
what kind of change?
• ANSWER: Physical change
B-200
• QUESTION: Name two examples of
chemical changes.
• ANSWER: Answers will vary.
– Burning wood
– Bike rusting
– Food digesting
– Cake baking
– Etc.
B-300
• QUESTION: What are some signs that a
chemical change has occurred?
• ANSWER: Fizzing (production of gas),
change in temp, change in color,
production of NEW SUBSTANCES,
production of heat, light, sound,
precipitate
B-400
• QUESTION: A solid changing straight to a
gas. (Dry ice) What kind of change is this?
• ANSWER: Physical
B-500
• QUESTION:
In the combustion of methane, one
molecule of methane, CH4, reacts with two
molecules of diatomic oxygen to produce
two molecules of water and one molecule
of carbon dioxide, CO2.
CH4 + 2 O2  2 H2O + CO2 What type of
change is this??
• ANSWER:
– Combustion is a chemical change
C-100
• QUESTION: What is the mass of 11.7 moles
of NH3?
C-200
• QUESTION: How many molecules are in a
14.0 g sample of CH4?
C-300
• QUESTION: How many atoms in a 4.6 g
sample of C atoms?
C-400
• QUESTION: What is the mass of 1.67 x 1024
atoms of Ca(OH)2?
C-500
• QUESTION: Challenge -- How many atoms
in 15.8 L of He gas at STP?
D-100
• QUESTION: Give the definition and three
examples of intensive properties.
• ANSWER: Property that does not change
with a change in amount. Ex: color,
texture, density
D-200
• QUESTION: Define a mole and how it is
used in chemistry
• ANSWER: A counting unit that equals
6.02 x 1023 representative particles of a
substance. Used to count tiny particles
D-300
• QUESTION: How many moles is 25 L of
neon gas?
D-400
• QUESTION: A compound is found to
contain 23.3% magnesium, 30.7% sulfur
and 46.0% oxygen. What is the empirical
formula of this compound?
• ANSWER: MgSO3
D-500
• QUESTION: 1) A compound is analyzed and
found to contain 30.4% nitrogen; 69.6%
oxygen. What is its empirical formula? If
this compound has a molar mass of
2) 92g/mol, what is the molecular formula?
• ANSWER: NO2, N2O4
E-100
• QUESTION: What does STP stand for?
What are these conditions? What is
significant about gases at these
conditions?
• ANSWER: Standard temp and pressure. 0
deg C, 1 atm. Equal vol. of gases at 0 C and
1 atm have the same number of particles.
E-200
• QUESTION: One mole of ANY gas at STP
occupies what volume?
• ANSWER: 22.4 L
E-300
• QUESTION: What is the volume, in mL, of
7.65 mol of F2 at STP?
E-400
• QUESTION: What is the percent
composition for H2SO4?
E-500
• QUESTION: What is the empirical formula
for a compound containing 26.57%
potassium, 35.36% chromium, and 38.07%
oxygen?
• ANSWER: K2Cr2O7
FINAL JEOPARDY
• QUESTION: Differentiate between pure
substances and mixtures. Give two
examples of each of the following:
elements, compounds, suspensions,
solutions, colloids.