$$3.78 \times 10^4$\ \mathrm{mg}$$

Question 1

Which of the following best describes the difference between precision and accuracy in scientific measurements?

Accepted Answer

Precision refers to how close repeated measurements are to each other, while accuracy refers to how close a measurement is to the true value.

Question 2

A gold ingot has a mass of 301 g and a volume of 15.6 cm$$^3. $$What is the density of gold in g/cm$$^3$$?

Accepted Answer

$$19.3\ \mathrm{g/cm^3$}$$

Question 3

Which of the following is an example of a chemical change?

Accepted Answer

Rusting of iron

Question 4

Convert 0.0833 lb of glucose to milligrams (mg). (1 kg = 2.205 lb, 1 kg = 1000 g, 1 g = 1000 mg)

Accepted Answer

$$3.78 	imes 10^4$\ \mathrm{mg}$$

Question 5

Which of the following is a derived SI unit?

Accepted Answer

Cubic meter (m$$^3)$$

Question 6

Express 0.0000772 in scientific notation.

Accepted Answer

$$7.72 	imes 10$$^{-6}$$

Question 7

Which of the following is an intensive property?

Accepted Answer

Density

Question 8

A car is traveling at 53 mi/h. What is its speed in ft/s? (1 mi = 1.609 km, 1 km = 1000 m, 1 m = 100 cm, 1 in = 2.54 cm, 1 ft = 12 in, 1 h = 3600 s)

Accepted Answer

$$78\ \mathrm{ft/s}$$

Question 9

Which quantum number describes the shape of an atomic orbital?

Accepted Answer

Azimuthal (angular momentum) quantum number ($$\ell)$$

Question 10

Which of the following substances is a heterogeneous mixture?

Accepted Answer

Milk

Question 11

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 12

Which rule states that electrons fill orbitals of lowest energy first?

Accepted Answer

Aufbau Principle

Question 13

A sample of mercury has a density of 13.6 g/mL. What is the mass of 5.50 mL of mercury?

Accepted Answer

$$74.8\ \mathrm{g}$$

Question 14

Which of the following is a correct conversion factor for changing inches to centimeters?

Accepted Answer

$$1\ \mathrm{in} = 2.54\ \mathrm{cm}$$

Question 15

Which of the following is a property of a paramagnetic atom?

Accepted Answer

It contains unpaired electrons

Question 16

Which of the following is a base SI unit?

Accepted Answer

Meter (m)

Question 17

Which of the following is an example of a systematic error?

Accepted Answer

A balance that is not calibrated, always reading 0.5 g too high

Question 18

Which of the following is the correct scientific notation for 568.762?

Accepted Answer

$$5.68762 	imes 10^2$

Question 19

Which of the following is a correct statement about the quantum mechanical model of the atom?

Accepted Answer

Electrons exist in a cloud-like region around the nucleus, described by probability.

General Chemistry Foundations: Matter, Measurement, and Quantum Theory

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