Question 1

Which of the following statements correctly describes the difference between isotopes of the same element?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 2

A sample contains a mixture of sand, salt, and water. Which type of matter does this sample best represent?

Accepted Answer

Heterogeneous mixture

Question 3

Which of the following best explains why a cation has a positive charge?

Accepted Answer

It has lost one or more electrons.

Question 4

Which of the following is a property common to metals?

Accepted Answer

They are good conductors of electricity.

Question 5

Which of the following chemical equations represents a combustion reaction?

Accepted Answer

$$\mathrm{CH_4$ + 2O_2 \rightarrow CO_2$ + 2H_2O}$$

Question 6

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

Accepted Answer

Elements in the same group have similar chemical properties.

Question 7

Which of the following is a strong acid?

Accepted Answer

$$\mathrm{HCl}$$

Question 8

Which of the following best describes the difference between a chemical and a physical change?

Accepted Answer

A chemical change results in the formation of new substances, while a physical change does not.

Question 9

Which of the following is a nonelectrolyte when dissolved in water?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} ($$glucose)

Question 10

Which of the following elements is a diatomic molecule in its natural state?

Accepted Answer

$$\mathrm{O_2$}$$

Question 11

Which of the following best describes the shape of a p orbital?

Accepted Answer

Dumbbell-shaped

Question 12

A reaction occurs in a closed container and the temperature of the surroundings increases. Which of the following statements is true about the reaction?

Accepted Answer

The reaction is exothermic and $$\Delta H is $$negative.

Question 13

Which of the following is an example of a single displacement (replacement) reaction?

Accepted Answer

$$\mathrm{Zn + 2HCl \rightarrow $$ZnCl_2$$ + H_2$}$$

Question 14

Which of the following best describes the 2nd Law of Thermodynamics?

Accepted Answer

The entropy of the universe increases in a spontaneous process.

Question 15

Which of the following is a common exception to the octet rule?

Accepted Answer

$$\mathrm{BF_3$} ($$boron trifluoride)

Question 16

Which of the following best describes a closed system?

Accepted Answer

It can exchange energy but not matter with its surroundings.

Question 17

Which of the following statements about precision and accuracy is correct?

Accepted Answer

Precision refers to how close repeated measurements are to each other, while accuracy refers to how close a measurement is to the true value.

Question 18

Which of the following best describes a crystal lattice structure?

Accepted Answer

A regular, repeating arrangement of ions or atoms in a solid.

Question 19

Which of the following is the correct SI unit for temperature in Chemistry?

Accepted Answer

Kelvin ($$\mathrm{K})$$

Question 20

Which of the following best describes a strong electrolyte?

Accepted Answer

A substance that completely dissociates into ions in solution.

CHE 1101 Final Exam Review – Study Guide: Step-by-Step Guidance

Guida di studio - Domande di pratica

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