INTRO TO
CHEMISTRY
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Which of the following is NOT matter?
SMOKE
SAND
AIR
LIGHT
VERY GOOD!!
Light is a form of energy and energy is NOT matter!
LIGHT
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INCORRECT
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Which of the following is NOT one of the three physical states of
matter?Solid
Gas
Aqueous
Liquid
Very good!
Solid, liquid, and gas are the three physical states of matter
Aqueous
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INCORRECT
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Which of the following best describes carbon monoxide (CO)?
Element
Heterogeneous mixture
Homogeneous mixture
Compound
Very Good!
Carbon monoxide (CO) is a compound. It is made up of two or more elements
CHEMICALLY combined.
Compound
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INCORRECT
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Salt water is an example of a…
Element Compound
Homogeneous mixture
Heterogeneous mixture
Very good!
Salt water is an example of a homogeneous mixture. The mixture looks uniform
throughout. However, it is a mixture because both the salt and the water maintain their original properties and can be physically
separated.
Homogeneous mixture
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INCORRECT
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Which of the following CANNOT be broken down into a simpler
substance?
Carbon (C)Juice
Oil and water
Sodium chloride (NaCl)
Very Good!
Carbon is an element. Elements cannot be broken into simpler substances.
Sodium chloride is a compound, oil and water is a heterogeneous mixture, and juice is a
homogeneous mixture. All three of these can be broken into simpler substances.
Carbon (C)
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INCORRECT
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The following are observations of what happens when two solutions are mixed. Which is NOT evidence that a chemical reaction has
occurred?
There is fizzing and bubbling
One of the solutions
was yellow to
start
The test tube feels
hotter
A solid forms
Very Good!
Production of a gas (seen by the fizzing and bubbling), energy released (the test tube felt hotter), and the formation of a solid are all
evidence that a chemical reaction has occurred.
One of the solutions
was yellow to
start
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INCORRECT
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Which of the following is an example of a chemical change?
Breaking a pencil in half
Salt dissolving in water
The corrosion of metal
Grinding garlic
Very good!
Remember in a chemical change…something NEW is produced
The corrosion of metal
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Phase changes are an example of a…
Chemical change
Physical change
Chemical property
Extensive property
Very good!
A phase change is only a change in state of mater so it is a physical change.
Physical change
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What would be the correct symbol for when solid salt (NaCl) is melted?
NaCl (l)
NaCl (g)
NaCl (aq)
NaCl (s)
Very good!
When salt is melted it becomes a liquid.
Remember that a liquid is different than an aqueous solution. An aqueous solution is made when a solid is dissolved in water.
NaCl (l)
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Mercury is a silver colored liquid. The silver color of mercury is an example of a ….
Extensive physical property Physical change
Intensive physical propertyChemical property
Very good!
Intensive properties to not depend on the amount of a substance.
Extensive properties DO depend on the amount of a substance…like mass or length
Intensive physical property
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INCORRECT
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What is true about the following reaction:
A (s) + B (aq) C (g) + D (aq)
C and D are reactants
D is a solid
A and B produce solid products
A and B are reactants
Very good!
A chemical reaction has this general form:
Reactants Products
A and B are reactants
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INCORRECT
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SCIENTIFIC
NOTATION
& SIG FIGS
Get started!
How do you write 0.00560 in scientific notation?
5.60 x 10-3 0.560 x 10-2
56.0 x 10-4 5.60 x 1030.560 x 102
Very good!
Remember that when writing a number in scientific notation, there should be ONE
number to the LEFT of the decimal. Since the number is less than 1, the exponent should be
negative.
5.60 x 10-3
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3.6 x 105 could be also written as…
3600000
0.360000
0.000036
0.00036
360000
Very good!
Since the exponent is positive, your decimal should be moving to the right.
360000
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How many sig figs are in the 0.0003005600?
10 3 711 4
Very good!
Remember that zeros in front of a number are placeholder zeros and are NOT significant.
Terminating zeros to the right of the decimal are significant. Any zero in between
significant numbers is significant
7
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INCORRECT
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How many sig figs are in the 70800000?
3
4
8
2
Very good!
Remember that zeros after a number but before the decimal are placeholder zeros and are
NOT significant. Any zero in between significant numbers is significant
3
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INCORRECT
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What is the correct answer to the following problem:7.815 + 2.07 =
9.885
9.88
9.89
9.9
Very good!
7.815 + 2.07 = 9.885When adding or subtracting two numbers, your
answer should have the same number of decimal places as the measurement with the least number of decimal places. 2.07 has two
decimal places so your answer should be rounded to 9.89
9.89
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CLOSE! But not quite correct…don’t forget about rounding!
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What is the correct answer to the following problem:
8.670 x 0.54 =
4.682
4.684.6818
4.7
Very good!
8.670 x 0.54 = 4.6818When you multiply or divide two numbers your
answer should have the same number of total sig figs as the answer with the fewest sig figs. 0.54 has two sig figs so your answer should be
rounded to 4.7
4.7
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INCORRECT
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Great Job! Good luck on your quiz!
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I’m in chemistry
I’m in honors
chemistry
Chemistry
• Don’t forget to also study how to record a measurement with the correct number of significant figures
• Finish the quiz review given in class for homework due Monday.
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Honors Chemistry
• Half of your quiz will be on the information in the presentation, the other half will be on dimensional analysis
• Don’t forget that the three dimensional analysis worksheets are due on Monday
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