Honors Chemistry
Measurement Worksheet 1.1
Name _________________________________
Date ____________ Class _____________
All work is to be completed in pencil. Show equations used, label all units.
Express the following numbers in standard notation or in scientific notation
Standard Notation
Scientific Notation
1. 590,056.0
2. 0.00346
3. 100
4.
2.33 x 10-4
5.
1.2430 x 107
6.
9.3 x 100
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
__________
4.
39.5
__________
5.
0.00760 __________
9. 1.95 x
__________
103
10. 541.005
__________
14. 11.4 x
__________
15. 1
10-8
__________
__________
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
11. (12.01 + 1.01 + 6)/101.4
12. determine the average of the following numbers: 8.2, 4.2, 11.8, 10.01
Density calculations. Show all work. Always include units. Box final answer. Pay attention to sig. fig’s. 𝒅 =
𝒎𝒂𝒔𝒔
𝒗𝒐𝒍𝒖𝒎𝒆
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.
1
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.
4.
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
Precision/Accuracy:
Student A
Student B
Student C
Trial 1
.192 g
.222 g
.010 g
Trial 2
.204 g
.212 g
.009 g
Trial 3
.174 g
.223 g
.011 g
1.
Which student has data that is the most accurate (accepted
value is 0.160 g), explain.
Average
2. Which student has the best precision? Explain.
3. Which student has the best overall data?
2
Moles:
1. Calculate the mass in grams of each of the following:
a) 2.0 moles of C
b)
1.25 moles of O2
c)
0.05 moles of CO2
d)
d)
.25 mol of He
4.Make the following conversions:
a) 55.5g of H2O to moles.
b)
.350 moles of sulfuric acid, H2SO4 to grams
c)
6.63 x 1024 propane molecules C3H8 , to grams
d)
1.50 x 1024 molecules of formaldehyde to grams.
e)
How many oxygens are represented in each of these
formulas?
i.
Ca(OH)2
2.5 x 10-3 moles of benzene. Structural formula is shown
here:
2.Calculate the molar mass of each of the following compounds:
a) methanol, CH3OH
b)
sucrose, C12H22O11
c)
1-propanol, CH3CH2CH2OH
d)
calcium phosphate, Ca3(PO4)2
ii.
Al2(SO4)3
iii.
K2SO4· 3H2O
5.
What is the percent composition of oxygen in formaldehyde?
See structure above (4d) for the formula.
6.
The compound dioxin, C12H4Cl4O2 , which has been linked to
birth defects. What is the percent composition of all the
elements in this compound?
3.Calculate the number of atoms or molecules of the following
quantities:
a) 20.0 g of Ca
b)
3.34 mol of CO2
c)
68.0 g of H2S
3
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) _________
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
4