Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout.

Question 2

Which statement about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 3

What is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 4

Which of the following is a chemical property?

Accepted Answer

Ability to react with oxygen.

Question 5

A sample contains sodium chloride dissolved in water. What type of mixture is this?

Accepted Answer

Homogeneous mixture (solution)

Question 6

Which of the following best represents the Lewis structure for methane ($$CH_4$$)?

Accepted Answer

A central carbon atom with four single bonds to four hydrogen atoms.

Question 7

Which of the following is NOT a characteristic of metals?

Accepted Answer

Poor electrical conductivity

Question 8

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 9

Which formula represents the molecular formula for ethane?

Accepted Answer

$$C_2H_6$$

Question 10

Which of the following is a functional group found in alcohols?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 11

A compound has the condensed formula $$CH_3CH_2CH_2CH_3. $$What is its skeletal formula?

Accepted Answer

A straight line with four vertices representing four carbon atoms.

Question 12

Which of the following best describes the VSEPR theory prediction for the shape of $$CO_2$$?

Accepted Answer

Linear

Question 13

Which of the following is a saturated hydrocarbon?

Accepted Answer

Ethane ($$C_2H_6)$$

Question 14

Which of the following is the correct order of increasing atomic radius for the elements Na, Mg, and Al?

Accepted Answer

Al \u003c Mg \u003c Na

Question 15

Which of the following is a correct statement about electronegativity?

Accepted Answer

Electronegativity increases across a period from left to right.

Question 16

Which of the following is the correct Lewis structure for water ($$H_2O$$)?

Accepted Answer

An oxygen atom with two single bonds to two hydrogen atoms and two lone pairs.

Question 17

Which of the following is a property of ionic compounds?

Accepted Answer

High melting point

Question 18

Which of the following is the correct molecular formula for cyclopentane?

Accepted Answer

$$C_5H_{10}$$

Question 19

Which of the following is a correct statement about the octet rule?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve eight valence electrons.

Question 20

Which of the following is a correct condensed formula for butane?

Accepted Answer

$$CH_3CH_2CH_2CH_3$$

CHEM 1001 Midterm Study Guide: Chapters 1–4 (GOB Chemistry)

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