Question 1

Which of the following best describes a mixture?

Accepted Answer

A combination of two or more substances in which each retains its own properties and can be separated by physical means.

Question 2

Which of the following is a physical change?

Accepted Answer

Melting ice to form liquid water.

Question 3

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 4

What is the correct scientific notation for the number 0.00056?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 5

A patient’s blood sample has a mass of 0.25 kg. How many grams is this?

Accepted Answer

$$250 g$$

Question 6

Which of the following elements is a transition metal?

Accepted Answer

Iron (Fe)

Question 7

How many valence electrons does phosphorus (P) have?

Accepted Answer

5

Question 8

Which of the following ions is a polyatomic ion?

Accepted Answer

$$SO_4$$^{2-}$$

Question 9

What is the electron configuration for a neutral oxygen atom?

Accepted Answer

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

Question 10

Which molecule is expected to have a bent molecular geometry?

Accepted Answer

$$H_2O$$

Question 11

Which of the following elements is most electronegative?

Accepted Answer

Fluorine (F)

Question 12

Which of the following compounds will form hydrogen bonds?

Accepted Answer

$$H_2O$$

Question 13

What is the charge on the sulfate ion?

Accepted Answer

$$-2$$

Question 14

Which of the following is a chemical change?

Accepted Answer

Burning gasoline in a car engine.

Question 15

A molecule of $$NH_3 ($$ammonia) has how many lone pairs on the central atom?

Accepted Answer

1

Question 16

Which of the following is a diatomic molecule that exists naturally?

Accepted Answer

Nitrogen ($$N_2)$$

Question 17

Which of the following best describes an ionic compound?

Accepted Answer

A compound formed by the transfer of electrons from a metal to a nonmetal.

Question 18

What is the approximate bond angle in a tetrahedral molecule such as $$CH_4$$?

Accepted Answer

$$109.5^\circ$$

Question 19

Which of the following compounds is nonpolar covalent?

Accepted Answer

$$CO_2$$

Question 20

A sample contains $$3.2 	imes 10^4$ micrograms ($$\mu$$g) of a drug. How many milligrams (mg) is this?

Accepted Answer

$$32 mg$$

GOB Chemistry Exam 1 Comprehensive Study Guide

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