Honors Chemistry
Chemistry Skills Worksheet 1.1
Scientific notation, significant figures, density
Name _________________________________
Date ____________ Class _____________
Express the following numbers in standard notation and then in scientific notation
Exponent notation
1. 645 x 105
2.
92562 x 10-3
3.
.33 x 107
4.
.00422 x 104
5.
.0055 x 10-4
Standard notation
Scientific notation
Determine the number of significant digits in each of the following
1.
.93
__________
6. 1.008
_________
11. 345, 288.00 __________
2.
340
__________
7. 10001
__________
12. 1,250,250
__________
3.
0.097
__________
8. 600
13. 0.010012
__________
__________
3
4.
39.5
__________
9. 1.95 x 10
5.
0.00760 __________
10. 541.005
__________
14. 11.4 x 10
__________
15. 1
-8
__________
__________
Complete the indicated operation and provide the final answer with the correct number of significant digits
Problem
Calculator answer
1.
2.698 x 33.20 x 1.5611
2.
8.032  0.591
3.
(3.2 x 103) (4.21x 102)
4.
3 x 154
5.
3.00 x 154
6.
7.623 + 85.0 + 9.815
7.
230.72 + 0.00861
8.
10.96 - 5.5
9.
23.6 - 16.1218
Answer rounded to the correct # of Sig.Figs.
10. 2.5 + 2.34 + 3.6543
Density calculations. Show all work. Always include units. Pay attention to sig. fig’s.
1.
A sample of seawater has a mass of 158 grams and has a volume of 156 mL. What is the density?
2.
What is the mass of ethyl alcohol that fills a 200.0 mL container? The density of ethyl alcohol is 0.789 g/mL.
3.
A block of lead has dimensions of 4.50 cm by 5.25 cm by 6.05 cm. The block has a mass of 1587 g. From this information
calculate the density.
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4.
28.5 g of iron shot is added to a graduated cylinder containing 45.5 mL of water. The water level rises to the 49.1 mL mark.
Calculate the density of the iron.
5.
The hydrogen stored in a large weather balloon weighs 13.558 g. What is the volume of this balloon if the density of hydrogen
is 0.089 g/mL?
Dimensional Analysis:
16 oz = 1 lb
1oz = 28.35 g
1kg = 2.2 lbs
1 L = 1.06 qts
1 in = 2.54 cm
1 ft = 12 in
1 mile = 1.61 km
1 mile = 1760 yds
2000lbs = 1 ton
1 cm3 = 1 mL
1 gallon = 4 qts
1mole=6.02 x 1023
15 birds = 1 dog
6 birds = 1 cat
4 birds = 1 frog
1. 3.61 lbs to kg
4. 4760 kg to tons
2. 0.43 oz to grams
5. 0.025 in to mm
3. 860.0 g to pounds (lbs)
6. 5.0 moles of C atoms to # of atoms
Properties and Changes Worksheet 1.2
Classify each of the materials below. In the center column, state whether the material is a pure substance or a mixture. If the
material is a pure substance, further classify it as either an element or compound in the right column. Similarly, if the material is a
mixture, further classify it as homogeneous or heterogeneous in the right column. Write the entire word in each space to earn full
credit.
Material
Pure Substance
or Mixture
Element, Compound,
Homogeneous, Heterogeneous
concrete
sugar + pure water
(C12H22O11 + H2O)
iron filings (Fe)
limestone (CaCO3)
orange juice (w/pulp)
Pacific Ocean
air inside a balloon
2
aluminum (Al)
magnesium (Mg)
acetylene (C2H2)
tap water in a glass
soil
pure water (H2O)
chromium (Cr)
salt + pure water
(NaCl + H2O)
benzene (C6H6)
muddy water
brass
(Cu mixed with Zn)
baking soda (NaHCO3)
Recall that physical properties can be observed without producing new substances. Chemical properties describe how a substance
interacts with other substances to produce new substances. Extensive properties depend upon the amount of matter in the sample;
intensive properties do not.
Directions, Part 1: Classify each of the properties listed below as extensive or intensive. Then classify each property as physical or
chemical. Write the word out to earn full credit.
Property
Extensive or Intensive
Property
Physical or Chemical
Property
color
combustibility
hardness
density
mass
melting point
ductility
volume
reactivity with acid
odor
weight
malleability
tendency to corrode
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Directions, Part 2: Some measurements or descriptions of properties are listed below. Write which property is being described in each
case. Select properties that are listed in the table from Part 1.
A.
15 dm3
A. ______________________
B.
can easily be hammered into sheets
B. ______________________
C.
2.8 g/cm3
C. ______________________
D.
burns when heated in the presence of O2
D. ______________________
E.
shiny metal forms a chalky white layer on its surface
E. ______________________
F.
can be scratched by a diamond
F. ______________________
G.
500oC
G. ______________________
H.
can easily be drawn into a wire
H. ______________________
I.
candle wax melting
I.
J.
water boiling at 100 oC
J. ______________________
______________________
Graduated Cylinder Worksheet
A graduated cylinder can have numerous scales.
1) Determine the value for the minor grids on the cylinder.
a) ______
b) _______
c) _______
d) _______
When reading a graduated cylinder you need to keep the graduated
cylinder on the desk and lower your eyes to the level of the meniscus
and you read where the bottom of the meniscus is. Be sure to include
one point of estimation in your reading.
2) Determine the volume of the liquids in the following cylinders:
a) _________
b) _________
c) _______ d) _________
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3) Draw in the meniscus for the following readings:
a) 49.21 mL
b) 18.2 mL
c) 27.65 mL
d) 63.8 mL
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