Assume that you have four red balls of equal size and four hypotheses concerning the masses of the balls: each ball has a different mass, there are balls of two masses, balls of three different masses are present, and all balls have the same mass. Which of the listed hypotheses would be eliminated if each of the following was determined? (Select all that apply.)

(a) two balls have the same mass

1

Each ball has a different mass. There are balls of two masses. Balls of three different masses are present. All balls have the same mass.

(b) three balls have the same mass

2

Each ball has a different mass. There are balls of two masses. Balls of three different masses are present. All balls have the same mass.

(c) there are two masses among three balls

3

Each ball has a different mass. There are balls of two masses. Balls of three different masses are present. All balls have the same mass.

(d) there are two masses among four balls

4

Each ball has a different mass. There are balls of two masses. Balls of three different masses are present. All balls have the same mass.

For each of the following numbers, will the exponent be positive, negative, or zero when the number is expressed in scientific notation?

(a)

1

positive negative     zero

(b)

2

positive negative     zero

(c)

3

positive negative     zero

(d)

4

positive negative     zero

A certain petroleum refinery operation uses hydrogen gas at the rate of 7 10⁴ g/min. Express this hydrogen consumption rate in the following units.

(a) dg/min

Enter a number with the correct number of significant figures.

1 dg/min
(b) g/s

Enter a number with the correct number of significant figures.

2 g/s
(c) kg/hr

Enter a number with the correct number of significant figures.

3 kg/hr
(d) ng/day

Enter a number with the correct number of significant figures.

4 ng/day

Give the English name and symbol for each of the following elements, whose Latin name is given.

(a) stannum english name Answer is not case sensitive. 1 symbol Answer is case sensitive. 2

(b) aurum english name Answer is not case sensitive. 3 symbol Answer is case sensitive. 4

(c) argentum english name Answer is not case sensitive. 5 symbol Answer is case sensitive. 6

(d) kalium english name Answer is not case sensitive. 7 symbol Answer is case sensitive. 8

The mercury level in the arm of a manometer (see Fig. 12.2) that is open to the atmosphere is found to be 31 mm lower than the mercury level in the arm of the manometer connected to the container of gas. Measured barometric pressure is 706 mm Hg. What is the pressure, in millimeters of mercury, of the gas in the container?

Enter a number with the correct number of significant figures.

1 mm Hg

Figure 12.2