Q: A sample contains 75% $$\mathrm{^{35}Cl} ($$atomic mass = 34.969 amu) and 25% $$\mathrm{^{37}Cl} ($$atomic mass = 36.966 amu). What is the average atomic mass of chlorine?

$$(0.75 \times 34.969) + (0.25 \times 36.966) = 35.468$$ amu

Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout, such as salt dissolved in water.

Question 2

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 3

A student measures the mass of a sample three times and obtains values that are very close to each other, but far from the true value. This is an example of:

Accepted Answer

High precision, low accuracy

Question 4

Which of the following is the correct nuclide symbol for an ion with 17 protons, 18 neutrons, and 18 electrons?

Accepted Answer

$$\mathrm{^{35}_{17}Cl$$^{-}$$}$$

Question 5

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 6

Which of the following is a chemical change?

Accepted Answer

Iron rusting in moist air

Question 7

A sample contains 75% $$\mathrm{^{35}Cl} ($$atomic mass = 34.969 amu) and 25% $$\mathrm{^{37}Cl} ($$atomic mass = 36.966 amu). What is the average atomic mass of chlorine?

Accepted Answer

$$(0.75 	imes 34.969) + (0.25 	imes 36.966) = 35.468$$ amu

Question 8

Which of the following compounds is ionic?

Accepted Answer

$$\mathrm{NaCl}$$

Question 9

Which of the following elements is NOT one of the 'big seven' diatomic elements?

Accepted Answer

Sulfur ($$\mathrm{S_2$})$$

Question 10

A student needs to convert 5.00 kilometers to centimeters. Which of the following is the correct calculation?

Accepted Answer

$$5.00 	imes 10^5$ cm

Question 11

Which of the following best describes the difference between an atom and a molecule?

Accepted Answer

An atom is a single particle of an element, while a molecule consists of two or more atoms chemically bonded together.

Question 12

Which of the following is a derived SI unit?

Accepted Answer

Joule ($$\mathrm{kg\ m^2$\ s$$^{-2}$$})$$

Question 13

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

Accepted Answer

$$\mathrm{CH_2O}$$

Question 14

Which of the following statements about ions is correct?

Accepted Answer

A cation has more protons than electrons.

Question 15

Which of the following is the correct number of significant figures in the measurement 0.004560 g?

Accepted Answer

4

Question 16

Which of the following elements is a metalloid?

Accepted Answer

Silicon ($$\mathrm{Si})$$

Question 17

Which of the following is the correct order of metric prefixes from largest to smallest?

Accepted Answer

kilo-, centi-, milli-

Question 18

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 19

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 20

A main-group element has 6 valence electrons. What is the typical charge of its ion?

Accepted Answer

$$2-$$

General Chemistry Study Guide: Matter, Measurement, Atoms, Molecules, and Ions

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