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Exam 1: Keys to the Study of Chemistry

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Question 31

Multiple Choice

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Which of the following represents the largest volume?

A) 10,000 µL
B) 1000 pL
C) 100 mL
D) 10 nL
E) 10 cm³

F) C) and D)
G) B) and D)

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Question 32

True/False

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The potential energy of a car moving on a level road does not depend on its speed.

A) True
B) False

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Question 33

Multiple Choice

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The result of (3.8621 $\times$ 1.5630) - 5.98 is properly written as

Write the following numbers and results in standard notation,with appropriate significant figures. a.7.85 $\times$ 10^-3 b.7.85 $\times$ 10⁴ c.5.920 $\times$ 10³ d. e.7.00 $\times$ 10^-5 f.circumference of a circle,2 $\pi$ r,where r = 8.7 cm g.

Which of the following is a chemical change?

Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid.It is used as talcum powder and face powder.A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm³) .What is the density of talc?

In each of the sets below,choose the one quantity or number which is exact. a.(i. )the human population (ii. )the distance in light years from the sun to Alpha Centauri,a nearby star (iii. )the winning time for the 100 m dash in the Olympic Games b.(i. )the weight of a particular one cent coin in g (ii. )the boiling point of lead,in °C (iii. )the number of cm in 1 yd c.(i. )the measured value of the speed of light (2.998... $\times$ 10⁸ m/s) (ii. ) $\pi$ (3.141... ) (iii. )the volume of milk in a 1-gallon jug

The appropriate number of significant figures in the result of 15.234 - 15.208 is

The ripening of fruit,once picked,is an example of physical change.

Which of the following correctly expresses 0.000007913 g in scientific notation?

Classify the following properties of hydrogen gas as either intensive or extensive. a.the mass of the gas sample b.the average speed of a molecule in the sample c.temperature d.density e.number of molecules present

When a wooden match burns in air,chemical potential energy is converted to kinetic energy.

The number 6.0448,rounded to 2 decimal places,becomes 6.05.

Select the answer that expresses the result of this calculation with the correct number of significant figures.

The number 6.0448,rounded to 3 decimal places,becomes 6.045.

Which of the following is an extensive property of oxygen?

Which one of the following is a "substance" in the sense of the word as used in your textbook?

The mass of a sample is 550 milligrams.Which of the following expresses that mass in kilograms?

An evacuated 276 mL glass bulb weighs 129.6375 g.Filled with an unknown gas,the bulb weighs 130.0318 g.Calculate the gas density in g/L,and express it with an appropriate number of significant figures.

You prepare 1000.mL of tea and transfer it to a 1.00 quart pitcher for storage.Which of the following statements is true?