Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in a fixed ratio.

Question 2

Which separation technique would be most appropriate to separate a mixture of sand and water?

Accepted Answer

Filtration

Question 3

A sample of apple juice is best classified as which type of matter?

Accepted Answer

Homogeneous mixture

Question 4

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have different numbers of neutrons.

Question 5

Given the following data for neon isotopes: $$^{20}\mathrm{Ne} (90.4838$$%, 19.9924 amu), $$^{21}\mathrm{Ne} (0.2696$$%, 20.99395 amu), $$^{22}\mathrm{Ne} (9.2465$$%, 21.9914 amu), calculate the average atomic mass of neon.

Accepted Answer

$$20.1797\ \mathrm{amu}$$

Question 6

Which of the following is a chemical change?

Accepted Answer

Burning a candle

Question 7

A neutral atom has an atomic number of 17 and a mass number of 37. How many neutrons does it have?

Accepted Answer

$$20$$

Question 8

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the individual components can be seen as separate domains

Question 9

Which of the following is NOT a property of metals?

Accepted Answer

Usually forms anions

Question 10

Which group in the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 11

A sodium ion has a charge of $$+1$$ and a mass number of $$23. $$How many electrons does it have?

Accepted Answer

$$10$$

Question 12

Which of the following best explains why compounds have fixed ratios of elements?

Accepted Answer

Because chemical bonds form only in specific proportions

Question 13

Which of the following is a transition metal?

Accepted Answer

Iron (Fe)

Question 14

Which statement about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 15

A sample contains only copper wires. This sample is best classified as:

Accepted Answer

An element

Question 16

Which of the following is true about the atomic nucleus?

Accepted Answer

It contains protons and neutrons.

Question 17

Which of the following best describes the main group elements?

Accepted Answer

Elements in groups 1, 2, and 13–18

Question 18

Which of the following is a correct statement about ions?

Accepted Answer

An ion is formed when an atom gains or loses electrons.

Question 19

Which of the following best describes a chemical reaction?

Accepted Answer

A process in which one or more substances are transformed into different substances.

Question 20

Which of the following is a property of isotopes of the same element?

Accepted Answer

They have the same number of protons.

Matter Classification, Atomic Theory, and the Periodic Table: Foundational Concepts in General Chemistry

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