$$250 \times \frac{1}{1000} = 0.25$$ liters

$$3.5 \times 1000 = 3500$$ meters

Question 1

Which of the following is the correct chemical formula for magnesium chloride?

Accepted Answer

$$\mathrm{$$MgCl_2$$}$$

Question 2

A student needs to convert 250 milliliters to liters using dimensional analysis. Which of the following is the correct conversion factor and answer?

Accepted Answer

$$250 	imes \frac{1}{1000} = 0.25$$ liters

Question 3

Which statement best describes a physical change?

Accepted Answer

The substance changes state, but its chemical identity remains the same.

Question 4

Which of the following elements has the electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^5$$?

Accepted Answer

Chlorine ($$\mathrm{Cl})$$

Question 5

A compound contains 2 atoms of hydrogen and 1 atom of oxygen. What is its chemical formula?

Accepted Answer

$$\mathrm{H_2O}$$

Question 6

Which of the following is NOT a chemical change?

Accepted Answer

Melting of ice

Question 7

If an atom has 11 protons, 12 neutrons, and 10 electrons, what is its net charge?

Accepted Answer

+1

Question 8

Which of the following best describes the difference between a mixture and a compound?

Accepted Answer

A mixture consists of two or more substances physically combined, while a compound consists of elements chemically bonded.

Question 9

Which of the following is the correct electron configuration for a calcium atom ($$\mathrm{Ca}$$, atomic number 20)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^6$$ $$4s^2$$

Question 10

A student measures the mass of a sample as 0.00560 kg. How many significant figures are in this measurement?

Accepted Answer

3

Question 11

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

Accepted Answer

They have a full valence shell, making them stable.

Question 12

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

Accepted Answer

Ability to react with acid

Question 13

A student needs to convert 3.5 kilometers to meters. What is the correct answer?

Accepted Answer

$$3.5 	imes 1000 = 3500$$ meters

Question 14

Which of the following best describes the atomic number of an element?

Accepted Answer

The number of protons in the nucleus

Question 15

Which of the following is the correct formula for aluminum sulfate?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 16

Which of the following is a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 17

Which of the following best describes the process of sublimation?

Accepted Answer

A solid changes directly into a gas

Question 18

A student records a temperature of 25°C. What is this temperature in Kelvin?

Accepted Answer

$$25 + 273 = 298 K$$

Question 19

Which of the following is the correct scientific notation for 0.00056?

Accepted Answer

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

College Prep Chemistry Midterm Study Guide: Key Topics and Learning Targets

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