Exam 1: Matter and Energy: The Origin of the Universe

How many carbon atoms does it take to produce a layer one atom deep that is the size of the period at the end of the next sentence? Assume the area covered by the period is 0.2 mm² and that one carbon atom has a diameter of 160 pm and covers an area of 0.02 nm².

Determine the maximum number of atoms that could comprise a baseball given that the volume of a baseball is 200 cm³ and the volume of an atom is 0.004 nm³.

The concentration (in % by volume) of methyl tert-butyl ether (MTBE) was determined in four samples of the same gasoline. What is the average value, and which measurement was the most accurate, compared to the average? Sample \% (v/v) 1 5.01 2 4.95 3 5.10 4 5.15

Which statement A-D about accuracy and precision is not correct?

Which one of the following statements is not correct?

Air is an example of __________

Which one of the following is a mixture?

Which of the following quantities has two significant figures?

The following measurements of the mass of an aspirin tablet were made by different students in a lab. Each set gives the results of 3 measurements followed by the average. Which set is the most precise? All values are in grams. The standard value reported by an analytical laboratory was 1.501 g.

As a summer intern at the National Institute of Standards and Technology, a student performed three measurements to determine the density of water at 25 $\degree$ C to four significant figures. She obtained the following results. The known density of water at 25 $\degree$ C to three significant figures is 0.958 g/mL. Trial Density (/) 1 0.9345 2 0.9346 3 0.9348 The measurements were __________

Which represents an intensive property?

An element __________

Which of the following is a heterogeneous mixture?

Which of the following is the most massive?

Which one of the following statements is not correct?

A solid forming a liquid is called ___________.

As a summer intern at the National Institute of Standards and Technology, a student performed three measurements to determine the density of water at 25 $\degree$ C to four significant figures. She obtained the following results. The known density of water at 25 $\degree$ C to three significant figures is 0.958 g/mL. Trial Density (/) 1 0.9345 2 0.9523 3 0.9107 The measurements were __________

What would you report for the total mass of three samples weighing 106.2 g, 33.15 g, and 0.028 g?

If the following arithmetic operations are carried out, how many significant figures should be reported in the answer? 132.0 + 0.56 + 0.01 + 3.33

If the following arithmetic operations were carried out on measured quantities, to how many significant figures should the answer be reported? (5.70*16.90) / 7.2356