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 remains unchanged in all natural phenomena.

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

$$\mathrm{12.6\ g/cm^3$}$$

Question 3

Convert 0.00043 to scientific notation.

Accepted Answer

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

Question 4

Which of the following is a pure substance?

Accepted Answer

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

Question 5

What is the correct formula to convert Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273$$

Question 6

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

Accepted Answer

$$0.280\ \mathrm{mL}$$

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 m?

Accepted Answer

3

Question 9

Which experiment provided evidence for the existence of the atomic nucleus?

Accepted Answer

Rutherford gold foil 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

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

Accepted Answer

$$\mathrm{Na^+}$$

Question 12

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

Accepted Answer

Iron(III) oxide

Question 13

Which of the following compounds is a molecular compound?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 14

Calculate the average atomic mass of an element with two isotopes: 70% abundance of 62 g/mol and 30% abundance of 64 g/mol.

Accepted Answer

$$62.6\ \mathrm{g/mol}$$

Question 15

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

Accepted Answer

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

Question 16

Which metric prefix represents $$10^{-9}$$?

Accepted Answer

nano

Question 17

A solution is prepared by dissolving salt in water. What type of mixture is this?

Accepted Answer

Homogeneous mixture

Question 18

Which of the following is the correct name for $$\mathrm{Ba(NO_3$)_2}$$?

Accepted Answer

Barium nitrate

Question 19

What is the charge on the ion formed by a Group VI element?

Accepted Answer

$$2-$$

Question 20

Which of the following best describes the difference between a cation and an anion?

Accepted Answer

A cation is positively charged and an anion is negatively charged.

Foundations of General Chemistry: Matter, Measurement, and Atomic Structure

Guida di studio - Domande di pratica

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