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(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?
25 mL
9.872000
Pouring chemical waste down the drain
chemical change
physical property
precise but not accurate
hot materials and spills of harmful liquids
the same time and day during each week of the investigation
(17) ___________________ a quality or condition of a substance that can be observed or measured.
25 mL
9.872000
Pouring chemical waste down the drain
chemical change
physical property
precise but not accurate
hot materials and spills of harmful liquids
the same time and day during each week of the investigation
(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?
25 mL
9.872000
Pouring chemical waste down the drain
chemical change
physical property
precise but not accurate
hot materials and spills of harmful liquids
the same time and day during each week of the investigation
(2) When working in the laboratory, which one of the following actions does NOT represent safe and correct chemical handling?
25 mL
9.872000
Pouring chemical waste down the drain
chemical change
physical property
precise but not accurate
hot materials and spills of harmful liquids
the same time and day during each week of the investigation
(18) ___________________ a change that produces matter with a different composition or properties than the original matter.
25 mL
9.872000
Pouring chemical waste down the drain
chemical change
physical property
precise but not accurate
hot materials and spills of harmful liquids
the same time and day during each week of the investigation
(15) This number has 7 significant figures.
25 mL
9.872000
Pouring chemical waste down the drain
chemical change
physical property
precise but not accurate
hot materials and spills of harmful liquids
the same time and day during each week of the investigation
(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 —
25 mL
9.872000
Pouring chemical waste down the drain
chemical change
physical property
precise but not accurate
hot materials and spills of harmful liquids
the same time and day during each week of the investigation
(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 —
25 mL
9.872000
Pouring chemical waste down the drain
chemical change
physical property
precise but not accurate
hot materials and spills of harmful liquids
the same time and day during each week of the investigation
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