Q: A sample contains $$1.52\ \mathrm{g} of$$ $$C_6H_{12}O_6$ (glucose). How many molecules of glucose are present? (Molar mass of glucose = 180.16$$\ \mathrm{g/mol}$$)

$$5.08 \times 10$$^{21}$$ molecules

Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically bonded in fixed proportions.

Question 2

Which property is classified as intensive?

Accepted Answer

Density

Question 3

A sample contains 3.00 g of substance X and occupies 0.50 L. What is the density of substance X in $$\mathrm{g/L}$$?

Accepted Answer

$$6.00\ \mathrm{g/L}$$

Question 4

Which statement about the law of conservation of matter is correct?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 5

Which of the following is a physical property?

Accepted Answer

Melting point

Question 6

A student measures the mass of a gold nugget to be 25.0 g and its volume to be 1.30 $$\mathrm{cm^3$}. $$What is the density of gold in $$\mathrm{g/cm^3$}$$?

Accepted Answer

$$19.2\ \mathrm{g/cm^3$}$$

Question 7

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture whose composition varies from point to point.

Question 8

Which of the following is the correct symbol for an atom with 17 protons, 18 neutrons, and a -1 charge?

Accepted Answer

$$^{35}\mathrm{Cl}^{-}$$

Question 9

Which statement about isotopes is true?

Accepted Answer

Isotopes of an element have identical chemical properties but different masses.

Question 10

Calculate the average atomic mass of element X if it has two isotopes: $$^{10}\mathrm{X} (20$$% abundance, mass = 10.0 amu) and $$^{11}\mathrm{X} (80$$% abundance, mass = 11.0 amu).

Accepted Answer

$$10.8\ \mathrm{amu}$$

Question 11

Which of the following is NOT a correct statement about the mole?

Accepted Answer

A mole of any substance has the same mass as a mole of any other substance.

Question 12

A sample contains $$1.52\ \mathrm{g} of$$ $$C_6H_{12}O_6$ (glucose). How many molecules of glucose are present? (Molar mass of glucose = 180.16$$\ \mathrm{g/mol}$$)

Accepted Answer

$$5.08 	imes 10$$^{21}$$ molecules

Question 13

Which of the following is a chemical change?

Accepted Answer

Rusting of iron

Question 14

Which of the following best represents the symbolic domain in chemistry?

Accepted Answer

A molecular formula such as $$H_2O$$

Question 15

Which statement about the Rutherford gold foil experiment is correct?

Accepted Answer

It showed that atoms are mostly empty space with a dense, positively charged nucleus.

Question 16

Which of the following is the correct empirical formula for glucose ($$C_6H_{12}O_6$)?

Accepted Answer

$$CH_2O$$

Question 17

A sample of chlorine contains 75.53% $$^{35}\mathrm{Cl} ($$mass = 34.97 amu) and 24.47% $$^{37}\mathrm{Cl} ($$mass = 36.97 amu). What is the average atomic mass of chlorine?

Accepted Answer

$$35.45\ \mathrm{amu}$$

Question 18

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 19

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that object.

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

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