Unit 1 Review
Complete the following metric facts
•
•
•
•
•
•
•
•
1 m = ______ cm
1 m = 100 cm
_______ g = 1 kg
1000 g = 1 kg
1 hL = _____ L
1 hL = 100 L
_________ µm = 1 m
1,000,000 µm = 1 m
How many sig figs are in the following
measurements?
•
•
•
•
•
•
672 mL
3
10 g
1
130.0 km
4
•
•
•
•
•
•
•
•
0.004 m
1
42.8 L
3
3030 g
3
38.000 hL
5
Uncertainty
• Explain how you determine the uncertainty of
a measuring instrument.
• +/- half the distance between the smallest
markings
Uncertainty
• What is the uncertainty of this
instrument?
• +/- 0.5 mL (the smallest mark is
every mL)
What is the mass (with uncertainty)?
• Read the mass from the triple beam balance.
Include uncertainty.
• 354.60 g +/- 0.05 g
• Which is the
uncertain digit?
• The 0
Accuracy & Precision
• Draw a picture for representing each
Accuracy & Precision
• Describe each scenario in terms of accuracy
and precision (high or low for each).
How many centimeters are there in 1.23 x 10-6
kilometers?
How many inches are there in 355 millimeters?
(Fact: 1 inch= 2.54 cm)
How many miles are there in 3.44 x 108 inches?
There are 0.61 miles in 1 km).
(Fact: 1 inch= 2.54 cm)
(Fact: 1 mile= 0.61 km)
Moles!
• List the three conversion factors you know about
moles:
• 1 mol =
• 6.02 x 1023 particles (atoms, molecules, oranges)
• 1 mol =
• 22.4 L of gas (at Standard Temperature and Pressure)
• 1 mol =
• Mass in grams from the periodic table
When there are 0.0314 moles of candy canes
how many candy canes are there?
If there are 9.6x1015 particles of sugar in a
solution then how many moles of sugar are
there?
Perform each calculation and round to correct
number of significant figures
Match the following
•
•
•
•
Sand and water
Carbon dioxide
Salt water solution
Copper wire
•
•
•
•
Element
Compound
Homogeneous mixture
Heterogeneous mixture
Mixture Separation
• Explain the difference between evaporation
and distillation
• Evaporation lets you keep the solute (solid at
room temperature), Distillation lets you keep a
liquid
Mixture Separation
• What is one mixture (other than sand and salt
water) that you could separate using
Filtration?
Define
• Insoluble
• Can’t dissolve in water (will stay a solid, can be
separated by filtration)
• Soluble
• Can dissolve in water (can be separated by
evaporation)
• Solution
• Something that is dissolved in water (the mixture)
• Precipitate
• Newly formed solid (because of a chemical reaction,
can be separated by filtration)
Use the data below
Time on hot Temperature
plate (s)
of water (°C)
60
36.5
120
55.3
180
76.8
240
95.8
Draw a good graph, include the following features:
• Axes labels and units
• A good title
• An appropriate scale
• Decide if the point (0, 0) makes sense as a data point
• Draw a best fit line
• Calculate the slope of the best fit line
• What are the units of the slope? What does the slope
mean?