Unit 1: Basic Chemical Math- Homework Packet

Part A: Measurements- Measure each of the following using correct significant figures. Include units in your answer.

1)______

2) ______

3)______

4)______

5)______

6)______

7)______

8)______

9)______

10)______

11)______

12)______

13)______

14)______

15)______

16)______

Part B: Sig Figs and Scientific Notation

How many sig figs are in the following numbers?

1)420.0 ______

2)7589 ______

3)432506.43 ______

4)0.0000476 ______

5)4.30000 x 10-22 ______

6)35.17 ______

7)0.0000004 ______

8)8671.5______

9)460.046 ______

10)0.008000 ______

11)45.00 ______

12)3.1 ______

13)0 ______

14)0. ______

15)600 ______

16)7.0101010 ______

Express you answers to the following with the appropriate number of sig figs:

17)422.6 + 23.135 + 310.04=

18)123.009 + 16.001 + 22.6=

19)44.79-2.3-0.0045=

20)2.90 x 0.01733 x 920=

21)(72) (4.022) / 9.03

22)(657.89)/ 32.9=

23)(34.567) (89.2) (54)=

24)789.235/ 47.36=

25)0.300 x 120 x 678=

26)(350.1 -19) x 30.0=

27)890/ 0.500=

28)1.58 x 1012 / 9.44 x 109=

29)(3 x 10-3) (3.21 x 105)=

30)4.000 x 1015 / 6.02 x 1023=

Express the following in scientific notation:

31)0.000 000 110 ______

32)0.000 027 ______

33)77 000 000 000 ______

34)410 000 ______

Express the following in standard notation:

35)4.3 x 108= ______

36)2.5 x 10- 2= ______

37)1.2 x 10- 4= ______

38)5.7 x 103= ______

Part C: Accuracy and Precision

39)A student experimentally determined the density of copper and recorded data in the table below. The actual density of copper is 8.96 g/mL. Describe the accuracy and precision of the student’s data:

40)Describe the accuracy and precision for the following targets:

Part D: Dimensional Analysis- Convert the following into the specified unit using dimensional analysis. SHOW WORK for credit. Remember sig figs!

1)Convert 78.90 daL into μL

2)Convert 9.00 x 1023 cm into Mm

3)Convert 16 seconds to weeks

4)Convert 36 cm/s to mph

5)Convert 54 yds to mm

6)Convert 55.0 gallons to cubic meters

7)Convert 1.00 year to minutes

8)Convert a speed of 35.8 miles per hour to meters per second

9)Convert a density of 13.6 grams per milliliter to pounds per liter

Conversion factors can be constructed from all kids of relationships. The following problems will give you practice in using dimensional analysis in unique situations.

10)A pitcher can throw a fastball that is clocked at 91.2 miles per hour. How many seconds does it take the fastball to travel from the pitcher’s mound to home plate, a distance of 18.44 meters? (hint: start with 18.44 m)

11)Assume a milliliter of water contains 20. Drops. How many drops of water are there in 2.50 gallons of water?

12)Chloroform is a liquid with a sticky sweet odor that was once used as a surgical anesthetic. If the density of chloroform is 1.49 g/mL, what is the volume in (liters) of 2.50 pounds of chloroform?

Part E: Equipment and Safety

1)Which piece of glassware is used to measure volume of a liquid? ______

2)What piece of equipment is used to spread the heat of a flame? ______

3)______has a metal rod with a heavy base and is used as a support.

4)______is used to grind chemicals.

5)______is used to evaporate small amounts of liquid.

6)What piece of equipment is used to transfer solid chemicals? ______

7)What piece of equipment is used to clean glassware? ______

8)List 3 inappropriate items of dress from the student on the left and three appropriate items of dress for the student on the right.

9)Sketch an outline of the classroom and label the position of the following lab safety equipment:

Fire blanket
Fire extinguisher
Safety shower
Eyewash station
Fume hood
Location of goggles
Location of aprons
Broken glassware disposal

Part F: Vocab and Concepts

1)What are the steps to the scientific method?

2)Observe an object and make two qualitative observations and two quantitative observations. Put your observations into a data table. Object observed: ______

3)What are significant figures?

4)What is the sig fig rule for addition and subtraction? ______

5)What is the sig fig rule for multiplication and division? ______

6)Why is scientific notation important?

7)What is the proper format for writing a number in scientific notation? ______

8)What is an uncertain digit?

9)Draw a meniscus and label which part of the meniscus you use to measure volume.

10)What are the 3 main metric base units? ______, ______, ______

11)List the metric prefixes and values from Mega to Micro. ______

12)What are conversion factors and give an example?

13)Conversion factors always equal ______.

14)Correct the following dimensional analysis set up:

15)What temperature scales are used in science? ______and ______

16)What is the boiling point and freezing point of water on both of these scales?

17)Model (draw) a block of pure gold on the microscopic level, macroscopic level, and symbolic level.