Q: A student measures the mass of a metal bar as 352 g and its dimensions as 7.00 cm × 4.00 cm × 1.00 cm. What is the density of the metal bar in $$\mathrm{g/cm^3$}$$?

$$\rho = \frac{352}{7.00 \times 4.00 \times 1.00} = \frac{352}{28.00} = 12.6\ \mathrm{g/cm^3$}$$

Q: A temperature is measured as $$54\ ^\circ\mathrm{F}. $$What is this temperature in Kelvin?

$$K = ((54 - 32) \times \frac{5}{9}) + 273 = (22 \times \frac{5}{9}) + 273 = (12.22) + 273 = 285\ \mathrm{K}$$

Q: Calculate the average atomic mass of an element with two isotopes: $$^{63}\mathrm{Cu} (69.17$$%, 62.9396 g/mol) and $$^{65}\mathrm{Cu} (30.83$$%, 64.9278 g/mol).

$$(0.6917 \times 62.9396) + (0.3083 \times 64.9278) = 63.55\ \mathrm{g/mol}$$

Question 1

Which of the following statements best describes the Law of Conservation of Energy as stated by Richard Feynman?

Accepted Answer

Energy is a numerical quantity that does not change during natural processes.

Question 2

A student measures the mass of a metal bar as 352 g and its dimensions as 7.00 cm × 4.00 cm × 1.00 cm. What is the density of the metal bar in $$\mathrm{g/cm^3$}$$?

Accepted Answer

$$ho = \frac{352}{7.00 	imes 4.00 	imes 1.00} = \frac{352}{28.00} = 12.6\ \mathrm{g/cm^3$}$$

Question 3

Which of the following is a pure substance?

Accepted Answer

Mercury ($$\mathrm{Hg})$$

Question 4

Convert $$0.00043 to $$scientific notation.

Accepted Answer

$$4.3 	imes 10$$^{-4}$$

Question 5

Which metric prefix corresponds to $$10^{-6}$$?

Accepted Answer

micro

Question 6

A temperature is measured as $$54\ ^\circ\mathrm{F}. $$What is this temperature in Kelvin?

Accepted Answer

$$K = ((54 - 32) 	imes \frac{5}{9}) + 273 = (22 	imes \frac{5}{9}) + 273 = (12.22) + 273 = 285\ \mathrm{K}$$

Question 7

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture where the different components can be seen with the naked eye

Question 8

How many significant figures are in the measurement $$0.0020\ \mathrm{m}$$?

Accepted Answer

3

Question 9

Which experiment provided the first measurement of the electron's charge-to-mass ratio ($$e/m$$)?

Accepted Answer

Thomson cathode ray tube experiment

Question 10

A neutral atom of $$^{14}_6\mathrm{C}$$ contains how many protons, neutrons, and electrons?

Accepted Answer

6 protons, 8 neutrons, 6 electrons

Question 11

Calculate the average atomic mass of an element with two isotopes: $$^{63}\mathrm{Cu} (69.17$$%, 62.9396 g/mol) and $$^{65}\mathrm{Cu} (30.83$$%, 64.9278 g/mol).

Accepted Answer

$$(0.6917 	imes 62.9396) + (0.3083 	imes 64.9278) = 63.55\ \mathrm{g/mol}$$

Question 12

Which of the following ions is isoelectronic with neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 13

Which of the following compounds is a binary ionic compound?

Accepted Answer

$$\mathrm{NaCl}$$

Question 14

What is the correct name for $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 15

Which of the following is the correct formula for potassium permanganate?

Accepted Answer

$$\mathrm{$$KMnO_4$$}$$

Question 16

A solution is prepared by dissolving $$6.00\ \mathrm{g} of $$platinum ($$\rho_{\mathrm{Pt}} = 21.4\ \mathrm{g/mL}). $$What is the volume of platinum in $$\mathrm{mL}$$?

Accepted Answer

$$V = \frac{6.00}{21.4} = 0.280\ \mathrm{mL}$$

Question 17

Which of the following best describes a colloid?

Accepted Answer

A mixture with particles that are not visible to the naked eye but are not truly homogeneous

Question 18

Which of the following is the correct name for $$\mathrm{Ba(OH)_2 \cdot 8H_2O}$$?

Accepted Answer

Barium hydroxide octahydrate

Question 19

Which of the following is the correct formula for lead(II) phosphate?

Accepted Answer

$$\mathrm{Pb_3$(PO_4$)_2}$$

General Chemistry Fundamentals: Matter, Measurement, Atomic Structure, and Nomenclature

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