Question 1

Which of the following correctly balances the chemical equation for the combustion of propane ($$\mathrm{C_3H_8}) in $$oxygen?

Accepted Answer

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

Question 2

A patient is prescribed a medication at a dosage of $$2.5\ \mathrm{mg/kg}$$ body weight. If the patient weighs $$70\ \mathrm{kg}$$, how many milligrams of medication should be administered?

Accepted Answer

$$175\ \mathrm{mg}$$

Question 3

Which of the following best defines valence electrons?

Accepted Answer

Electrons in the outermost shell of an atom that are involved in chemical bonding

Question 4

Which of the following represents the process of sodium ($$\mathrm{Na}) $$becoming a stable ion?

Accepted Answer

$$\mathrm{Na} \rightarrow \mathrm{Na}^+ + e^-$$

Question 5

Which statement best describes an ionic bond?

Accepted Answer

A chemical bond formed by the transfer of electrons from one atom to another

Question 6

A solution contains $$15.0\ \mathrm{g} of $$NaCl dissolved in $$250.0\ \mathrm{mL} of $$water. If the density of the solution is $$1.05\ \mathrm{g/mL}$$, what is the total mass of the solution?

Accepted Answer

$$262.5\ \mathrm{g}$$

Question 7

Which of the following is the correct Lewis structure for methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

A central carbon atom with four single bonds to four hydrogen atoms, each hydrogen having no lone pairs and carbon having no lone pairs

Question 8

How many moles are in $$18.0\ \mathrm{g} of $$water ($$\mathrm{H_2O}$$)? (Molar mass of $$\mathrm{H_2O} = 18.0\ \mathrm{g/mol})$$

Accepted Answer

$$1.0\ \mathrm{mol}$$

Question 9

Which of the following best describes a charge cloud in the context of molecular geometry?

Accepted Answer

A region around a central atom where electrons are likely to be found, including both bonding and lone pairs

Question 10

How do lone pairs on the central atom affect the bond angles in a molecule such as ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

Lone pairs repel bonding pairs more strongly, decreasing the bond angles compared to a molecule with no lone pairs

Question 11

Which of the following molecules is polar due to both bond polarity and molecular geometry?

Accepted Answer

$$\mathrm{H_2O} ($$water)

Question 12

Given the condensed structure $$\mathrm{CH_3CH_2OH}$$, which of the following is the correct skeletal structure?

Accepted Answer

A two-carbon chain with an -OH group attached to the second carbon

Question 13

What is the IUPAC name for the following structure: $$\mathrm{CH_3CH_2CH_2CH_3}$$?

Accepted Answer

Butane

Question 14

Which of the following pairs are structural isomers?

Accepted Answer

$$\mathrm{C_4H_{10}} ($$butane) and $$\mathrm{C_4H_{10}} ($$isobutane)

Question 15

Which of the following alkenes can exhibit cis-trans isomerism?

Accepted Answer

$$\mathrm{2	ext{-}butene}$$

Question 16

On a reaction coordinate diagram, what does the difference in energy between reactants and products represent?

Accepted Answer

$$\Delta G ($$Gibbs free energy change)

Question 17

In the reaction $$\mathrm{Zn} + \mathrm{Cu$$^{2+}$$} \rightarrow \mathrm{Zn$$^{2+}$$} + \mathrm{Cu}$$, which atom is oxidized?

Accepted Answer

$$\mathrm{Zn}$$

Question 18

In the same reaction $$\mathrm{Zn} + \mathrm{Cu$$^{2+}$$} \rightarrow \mathrm{Zn$$^{2+}$$} + \mathrm{Cu}$$, which species acts as the reducing agent?

Accepted Answer

$$\mathrm{Zn}$$

Question 19

A nurse needs to prepare $$250\ \mathrm{mL} of a$$ $$0.9\% (w/v) $$NaCl solution for an IV. How many grams of NaCl are required?

Accepted Answer

$$2.25\ \mathrm{g}$$

Question 20

Which of the following best represents a double-replacement (precipitation) reaction?

Accepted Answer

$$\mathrm{$$AgNO_3$$} + \mathrm{NaCl} \rightarrow \mathrm{AgCl} + \mathrm{$$NaNO_3$$}$$

CHEM1050 Midterm Study Guide: Key Concepts and Skills (Chapters 1–5)

Study Guide - Practice Questions

Study Guide - Flashcards