CBA 1 - Review Question Preview (ID: 26703)
CBA 1 - Review.
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(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) Pouring hydrochloric acid into a beaker
b) Filtering precipitates from a liquid solution
c) Collecting oxygen from plants in a test tube
d) Work in a fume hood
(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) Use the diagram to the right to answer this question. Why is the funnel with filter paper used in this filtering procedure?
a) to get a better grip on the beaker and keep the beaker angled
b) to direct the mixture into the funnel and reduce splashing
c) to keep undissolved particles from going into the filter paper
d) to separate solid particles from the liquid particles
(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) release of hazardous gases
b) hot materials and spills of harmful liquids
c) contamination of chemicals and glassware
d) staining of lab clothing
(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) 25 mL
c) 50 mL
d) 100 mL
(6) What equipment would be needed to carry out an investigation which tests this hypothesis? Assuming water and food coloring are already provided.
a) balance, graduated cylinders, notebook
b) stopwatch, thermometer, balance
c) graduated cylinders, stopwatch, notebook
d) beakers, stopwatch, graduated cylinder
(8) ______________ is when the average value recorded in the laboratory matches the true or known value.
a) accuracy/ accurate
b) precision/ precise
c)
d)
(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
c)
d)
(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) accurate but not precise.
b) precise but not accurate
c) both accurate and precise
d) neither precise nor accurate
(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) the same time and day during each week of the investigation
b) different times and days during each week of the investigation
c) any time during the first week of the investigation
d) one randomly selected time during the investigation
(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) Perform a second investigation using different tools
b) Use several thermometers to measure temperature
c) Develop a hypothesis before starting the investigation
d) Repeat the entire investigation several times
(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) accurate but not precise
b) precise but not accurate
c) both accurate and precise
d) neither precise nor accurate
(15) This number has 7 significant figures.
a) 0.003490
b) 7.60 x10^45
c) 9.872000
d) 10,091,986
(16) Put 0.00480 into scientific notation with three significant figures.
a) 0.480 x10^-2
b) 4.8 x10^3
c) 4.80 x10^3
d) 4.80 x10^-3
(17) ___________________ a quality or condition of a substance that can be observed or measured.
a) physical property
b) physical change
c) chemical property
d) chemical change
(18) ___________________ a change that produces matter with a different composition or properties than the original matter.
a) physical property
b) physical change
c) chemical property
d) chemical change
(19) ___________________ the ability of a substance to undergo a specific chemical change.
a) physical property
b) physical change
c) chemical property
d) chemical change
(20) ___________________ a change during which some properties of a material change but not the composition.
a) physical property
b) physical change
c) chemical property
d) chemical change
(21e) Two solutions are mixed and a precipitate forms.
a) physical change
b) chemical change
c)
d)
(21f) A balloon filled with helium gas gets larger as it is heated.
a) physical change
b) chemical change
c)
d)
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