(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?

(2) When working in the laboratory, which one of the following actions does NOT represent safe and correct chemical handling?

(3) Use the diagram to the right to answer this question. Why is the funnel with filter paper used in this filtering procedure?

(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 —

(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?

(6) What equipment would be needed to carry out an investigation which tests this hypothesis? Assuming water and food coloring are already provided.

(8) ______________ is when the average value recorded in the laboratory matches the true or known value.

(9) ______________ is when all of the values recorded in a laboratory are close together, regardless of the true value.

(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 –

(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 —

(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?

(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?

(15) This number has 7 significant figures.

(16) Put 0.00480 into scientific notation with three significant figures.

(17) ___________________ a quality or condition of a substance that can be observed or measured.

(18) ___________________ a change that produces matter with a different composition or properties than the original matter.

(19) ___________________ the ability of a substance to undergo a specific chemical change.

(20) ___________________ a change during which some properties of a material change but not the composition.

(21e) Two solutions are mixed and a precipitate forms.

(21f) A balloon filled with helium gas gets larger as it is heated.

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