Question 1

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

Accepted Answer

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

Question 2

A student mixes two clear solutions and observes the formation of a solid precipitate. Which type of change has occurred?

Accepted Answer

Chemical change, because a new substance (precipitate) is formed.

Question 3

Which of the following is the correct electron configuration for a neutral phosphorus atom ($$Z = 15$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^3$$

Question 4

Which of the following pairs of elements would form an ionic compound?

Accepted Answer

Sodium and chlorine

Question 5

A potassium ion ($$K^+) $$has:

Accepted Answer

19 protons, 18 electrons

Question 6

Which of the following is the correct formula for the compound formed between magnesium and nitrogen?

Accepted Answer

$$Mg_3N_2$$

Question 7

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 8

Which of the following elements has the largest atomic radius?

Accepted Answer

Sodium ($$Na)$$

Question 9

A sample of metal has a mass of $$8.5\ g$$ and a volume of $$3.4\ mL. $$What is its density?

Accepted Answer

$$2.5\ g/mL$$

Question 10

Which of the following is the correct name for $$FeCl_3$$?

Accepted Answer

Iron(III) chloride

Question 11

Which of the following best explains why noble gases are generally unreactive?

Accepted Answer

They have a full valence shell of electrons.

Question 12

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad dressing

Question 13

Which of the following is the correct scientific notation for 0.0000051?

Accepted Answer

$$5.1 	imes 10$$^{-6}$$

Question 14

Which of the following best describes the trend in ionization energy across a period from left to right?

Accepted Answer

Ionization energy increases

Question 15

Which of the following is the correct formula for the compound formed between aluminum and oxygen?

Accepted Answer

$$Al_2O_3$$

Question 16

A neutral atom of sulfur ($$S) $$has:

Accepted Answer

16 protons, 16 electrons

Question 17

Which of the following is a correct example of a chemical property?

Accepted Answer

Iron reacts with oxygen to form rust.

Question 18

Which of the following best describes the block of the periodic table that contains the transition metals?

Accepted Answer

d-block

Question 19

Which of the following is the correct electron configuration for a $$Ca^{2+}$$ ion?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$

Question 20

A graduated cylinder contains $$35.0\ mL of $$water. An object is dropped in, and the water rises to $$38.5\ mL. If $$the object has a mass of $$8.4\ g$$, what is its density?

Accepted Answer

$$2.4\ g/mL$$

College Prep Chemistry Midterm Review: Comprehensive Study Notes

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