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CBA 1 - Review
Test Description: CBA 1 - Review
Instructions: Answer all questions to get your test result.
1) (1) The label shown to the right contains information about some harmful effects of acetone. Which of the following lab procedures is the most appropriate action students should take when working with this chemical?
A
Filtering precipitates from a liquid solution
B
Collecting oxygen from plants in a test tube
C
Pouring hydrochloric acid into a beaker
D
Work in a fume hood
2) (2) When working in the laboratory, which one of the following actions does NOT represent safe and correct chemical handling?
A
Pouring chemical waste down the drain
B
Cleaning up chemical spills immediately
C
Washing hands after handling chemicals
D
Keeping noxious or dangerous chemicals under fume hoods
3) (3) Use the diagram to the right to answer this question. Why is the funnel with filter paper used in this filtering procedure?
A
to separate solid particles from the liquid particles
B
to keep undissolved particles from going into the filter paper
C
to direct the mixture into the funnel and reduce splashing
D
to get a better grip on the beaker and keep the beaker angled
4) (4) An experiment requires the use of a lab apron, goggles, and insulated mitts or beaker tongs. The purpose of these safety items is primarily to protect against —
A
contamination of chemicals and glassware
B
staining of lab clothing
C
release of hazardous gases
D
hot materials and spills of harmful liquids
5) (5) Assuming in a lab that 21.2 mL of liquid is needed, which of the following sizes of graduated cylinders is best to use?
A
10 mL
B
100 mL
C
50 mL
D
25 mL
6) (6) What equipment would be needed to carry out an investigation which tests this hypothesis? Assuming water and food coloring are already provided.
A
graduated cylinders, stopwatch, notebook
B
beakers, stopwatch, graduated cylinder
C
balance, graduated cylinders, notebook
D
stopwatch, thermometer, balance
7) (8) ______________ is when the average value recorded in the laboratory matches the true or known value.
A
accuracy/ accurate
B
precision/ precise
8) (9) ______________ is when all of the values recorded in a laboratory are close together, regardless of the true value.
A
accuracy/ accurate
B
precision/ precise
9) (10) A group of students had a graduated cylinder with 22.0 mL water in it and each student recorded the volume of the water. Their measurements were: 19.0 mL, 18.9 mL, and 28.1 mL. The group’s measurements were –
A
both accurate and precise
B
neither precise nor accurate
C
accurate but not precise.
D
precise but not accurate
10) (11) Some students investigate the rusting rate of four metals in saltwater. To best find the rusting rates, the students should measure the masses of the metals before the investigation and at —
A
any time during the first week of the investigation
B
the same time and day during each week of the investigation
C
different times and days during each week of the investigation
D
one randomly selected time during the investigation
11) (12) A student uses a hot plate, a thermometer, and a stopwatch to investigate the rate at which a metal object conducts heat. To ensure the most reliable results, which of the following should the student do?
A
Use several thermometers to measure temperature
B
Develop a hypothesis before starting the investigation
C
Perform a second investigation using different tools
D
Repeat the entire investigation several times
12) (13) A group of students working in a lab recorded the mass of an unknown substance as 2.85 g, 2.86 g, 2.84, and 2.81 g. Considering that the true value is 2.46 g, how would you describe the data set?
A
precise but not accurate
B
neither precise nor accurate
C
accurate but not precise
D
both accurate and precise
13) (15) This number has 7 significant figures.
A
9.872000
B
7.60 x10^45
C
10,091,986
D
0.003490
14) (16) Put 0.00480 into scientific notation with three significant figures.
A
0.480 x10^-2
B
4.80 x10^-3
C
4.80 x10^3
D
4.8 x10^3
15) (17) ___________________ a quality or condition of a substance that can be observed or measured.
A
chemical property
B
physical change
C
chemical change
D
physical property
16) (18) ___________________ a change that produces matter with a different composition or properties than the original matter.
A
physical property
B
chemical property
C
chemical change
D
physical change
17) (19) ___________________ the ability of a substance to undergo a specific chemical change.
A
physical change
B
chemical change
C
physical property
D
chemical property
18) (20) ___________________ a change during which some properties of a material change but not the composition.
A
physical property
B
chemical change
C
chemical property
D
physical change
19) (21e) Two solutions are mixed and a precipitate forms.
A
chemical change
B
physical change
20) (21f) A balloon filled with helium gas gets larger as it is heated.
A
physical change
B
chemical change
*select an answer for all questions
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