TEST

C 1.The amount of liquid measured in a measuring cylinder would BEST be recorded as

A.16.5 cm

B.16.5 mm

C.16.5 mL

D.16.5 feet

D 2.The measurement that shows three significant digits is

A.3050.0 g

B.0.010 g

C.0.006 g

D.0.204 g

C 3.0.000 042 6 expressed in proper scientific notation format is

A.4.26 x 105

B.0.426 x 10–4

C.4.26 x 10–5

D.42.6 x 10–6

C 4.Convert 25.2 L to milliliters, which is the right choice

A.252 mL

B.252 000 mL

C.2.52 x 104 mL

D.2 500 mL

B 5.0.1 L is equal to _____ mL

A.100.0 mL

B.1 x 102 mL

C.1.00 x 102 mL

D.10 mL

C 6.If the mass of chemical and beaker is 158.35 g and the mass of the beaker alone is 27.6g, then the amount of chemical present is

A.130.7 g

B.130.75

C.130.8 g

D.131. g

A 7.A student combines pieces of zinc from 3 measured samples whose masses are respectively, 27.086 g, 19.3 g, and 205.32 g. The total mass of zinc available is

A.251.7 g

B.251.706 g

C.251.71 g

D.251.8 g

B 8.Express0.0015 in scientific notation

A.1.50 x 10–4 g

B.1.5 x 10–3 g

C.150 x 10–4 g

D.15 x 10–3 g

B 9.The unit that does NOT belong in the list below is

A.gross.

B.gram.

C.mole.

D.dozen.

C 10.Which one of the following units does NOT record volume of a liquid

A.centiliter

B.Liter

C.gram.

D.gallon

C 11.The correct procedure for lighting a Bunsen burner is

A.open the air control, turn on the gas control to minimum flow, light the burner, adjust the gas and air control.

B.open the air control, turn on the gas control fully, light the burner, adjust the gas and air control.

C.close the air control, turn on the gas control to minimum flow, light the burner, adjust the gas and air control.

D.close the air control, turn on the gas control fully, light the burner, adjust the gas and air control.

A 12.In the event of an accident in the laboratory, which is the UNSAFE procedure?

A.If broken glass pierces the skin, attempt to extract the glass particles at once.

B.If an acid or any caustic material is spilled, thoroughly wash affected area with water.

C.If an article of clothing catches fire, attempt to smother the fire.

D.If an acid or caustic solution is splashed in the eye, do not rub the eye.

C 13.If an unknown corrosive liquid is spilled on the skin, the student should immediately

A.wash the skin thoroughly with a solution of a weak base

B.apply an ointment, such as Neosporin, to the skin

C.wash the skin thoroughly with water

D.wash the skin thoroughly with a solution of a weak acid

C 14.The following procedures performed by students in a laboratory were observed:

1.placing the funnel several centimeters above the beaker in which the filtrate is collected when doing a filtration

2.recording a reading from a centigram balance to two decimal places

3.placing a solid chemical directly on the balance pan

4.placing the glass stopper of a reagent bottle on the bench while pouring out the liquid chemical

5.placing a glass rod over the lip and across the top of the beaker when pouring out the contents of the beaker

The total number of INCORRECT procedures in the list above is

A.1

B.2

C.3

D.4

B 15.A student in a laboratory was observed performing the following actions during an exercise:

1.using a scoopula to transfer an apparently non-corrosive solid chemical

2.turning the Bunsen burner gas control down to yield a small blue flame while getting more chemicals

3.drinking water from a beaker that appears to be clean

4.checking the label on a reagent bottle even if its contents are obvious

The UNSAFE practice(s) in the above routine is/are

A.3 only

B.2 and 3 only

C.1 and 4 only

D.all of these

16. Flammable materials, like alcohol, should never be dispensed or used near

A. an open door.

B. an open flame.

C. another student.

D. a sink.

17. After completing an experiment, all chemical wastes should be

A. left at your labstation for the next class.

B. disposed of according to your instructor’s directions.
C. dumped in the sink.

D. taken home.

18. You are heating a substance in a test tube. Always point the open end of the tube

A. toward yourself.

B. toward your lab partner.

C. toward another classmate.

D. away from all people.

19. You have been injured in the laboratory (cut, burn, etc.). First you should

A. visit the school nurse after class.

B. see a doctor after school.

C. tell the science instructor at once.

D. apply first aid yourself.

20. If a piece of equipment is not working properly, stop, turn it off, and tell

A. the custodian.

B. your lab partner.

C. your best friend in the class.

D. the science instructor.

21. What is 0.006 70 m in correct scientific notation?

A / 6.70 x 10 ^ -2 m
B / 67.0 x 10 ^ -3
C / 6.70
D / none of the above

22. What is 350 000 in correct scientific notation? ‭(1point)‬

A / 3.5 x 10 ^ -5
B / 3.5 x 10 ^ -4
C / 3.5 x 10 ^ 5
D / none of the above

23. Which number is NOT written in scientific notation?

A2.567 × 10–2

B6.7 × 102

C15.5 × 104

D3 × 10–10

24. Write 2,564,000 in scientific notation.
A. / 2,564×103
B. / 2.564×106
C. / 2.564×105
D. / 25.64×105

25. How many significant figures are in the following values?

A. 4.02 x 10-9

B. 0.008320

C. 6 x 105

D. 100.0

Perform the following metric conversions.

26.12 cm3 = ______mL

27.0.0951 L = ______mL

28.23.6 mg =______g

29.3.5 km =______m

30.7.76 mol = ______mmol

Determine the number of significant digits in each of the following.

31.60 min/h ______

32.0.00876 mol______

33.3.502 x 10-3 cm3 ______

34.4.50 g ______

35.15 mL______

Convert each number from real to scientific notation.

36.45.84

37.1.661

38.4,264

39.0.04544

40.868.3

Open Ended.

Complete the following operations and write the number of significant digits in each.

1. 6.7 g

0.03 g

+ 3.89 g

2. 5.09 g

–123.7 mg

3.0.015 mol

0.125 L

4. 41.6g

+ 3.87g

5. 16.0mL

 5mL

Test on Sig figs, Metric Conversion, Scientific notation and Lab safety

Answer Sheet

Name: ______Date:______

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For questions 26-30 Show work at the side.

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For questions 36-40 Show work at the side.

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Unit F