Question 1

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 2

Which of the following changes is a chemical change?

Accepted Answer

Burning wood

Question 3

An element has an atomic number of 17 and a mass number of 37. How many neutrons does it have?

Accepted Answer

$$37 - 17 = 20$$ neutrons

Question 4

Which of the following statements about metals is correct?

Accepted Answer

Metals tend to lose electrons to form positive ions.

Question 5

What is the correct name for the compound $$\mathrm{Na_2SO_4}$$?

Accepted Answer

Sodium sulfate

Question 6

Which of the following molecules has a trigonal planar shape according to VSEPR theory?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 7

Balance the following equation: $$\mathrm{C_3H_8} + \mathrm{O_2$} \rightarrow \mathrm{CO_2$} + \mathrm{H_2O}$$

Accepted Answer

$$\mathrm{C_3H_8} + 5\mathrm{O_2$} \rightarrow 3\mathrm{CO_2$} + 4\mathrm{H_2O}$$

Question 8

Which of the following is a redox reaction?

Accepted Answer

$$\mathrm{Zn} + \mathrm{$$CuSO_4$$} \rightarrow \mathrm{$$ZnSO_4$$} + \mathrm{Cu}$$

Question 9

A sample of gas has a volume of $$2.0\ \mathrm{L} at$$ $$1.0\ \mathrm{atm}. $$What will the volume be at $$0.50\ \mathrm{atm}$$, assuming temperature is constant? (Boyle’s Law: $$P_1V_1 = P_2V_2)$$

Accepted Answer

$$4.0\ \mathrm{L}$$

Question 10

What is the molarity of a solution prepared by dissolving $$10.0\ \mathrm{g} of$$ $$\mathrm{NaCl} ($$molar mass $$= 58.44\ \mathrm{g/mol}) in $$enough water to make $$500.0\ \mathrm{mL} of $$solution?

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 11

Which of the following is a characteristic of a strong acid?

Accepted Answer

It ionizes completely in water.

Question 12

Which of the following is the conjugate base of $$\mathrm{$$HCO_3$$^-}$$?

Accepted Answer

$$\mathrm{CO_3$^{2-}}$$

Question 13

If the $$[\mathrm{H_3O^+}] in a $$solution is $$1.0 	imes 10$$^{-4}$$\ \mathrm{M}$$, what is the pH?

Accepted Answer

$$4.00$$

Question 14

A buffer solution is important in the human body because:

Accepted Answer

It helps maintain a constant pH in blood.

Question 15

Which of the following will shift the equilibrium of the reaction $$\mathrm{N_2$} + 3\mathrm{H_2$} \rightleftharpoons 2\mathrm{NH_3$} to $$the right according to Le Chatelier’s principle?

Accepted Answer

Increasing the pressure

Question 16

What is the product of the neutralization reaction between $$\mathrm{H_2SO_4}$$ and $$\mathrm{KOH}$$?

Accepted Answer

$$\mathrm{K_2SO_4}$$ and $$\mathrm{H_2O}$$

Question 17

A solution is prepared by diluting $$25.0\ \mathrm{mL} of$$ $$2.00\ \mathrm{M}$$ $$\mathrm{HCl} to a $$final volume of $$100.0\ \mathrm{mL}. $$What is the final concentration?

Accepted Answer

$$0.500\ \mathrm{M}$$

Question 18

Which of the following best describes water ($$\mathrm{H_2O}) in $$acid-base chemistry?

Accepted Answer

It is amphiprotic, acting as both an acid and a base.

Question 19

A patient’s blood pH drops from 7.40 to 7.10. What does this indicate?

Accepted Answer

The blood has become more acidic, which can be dangerous to health.

CHM101 Final Exam Review: Key Concepts and Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards