Question 1

Which of the following best describes a chemical property of matter?

Accepted Answer

Iron rusts when exposed to oxygen.

Question 2

A student mixes two clear solutions in a beaker and observes the formation of a white solid. Which type of chemical reaction has most likely occurred?

Accepted Answer

Precipitation reaction

Question 3

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 4

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine ($$\mathrm{F})$$

Question 5

What is the correct formula for aluminum sulfate?

Accepted Answer

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

Question 6

A sample of gas occupies $$4.00\ \mathrm{L} at$$ $$1.00\ \mathrm{atm}$$ and $$300\ \mathrm{K}. $$What will be its volume at $$2.00\ \mathrm{atm}$$ and $$300\ \mathrm{K}$$, assuming ideal behavior?

Accepted Answer

$$2.00\ \mathrm{L}$$

Question 7

Which of the following best explains why water is a liquid at room temperature while methane ($$\mathrm{CH_4$}) is a $$gas, despite their similar molar masses?

Accepted Answer

Water molecules form hydrogen bonds, which are stronger than the London dispersion forces in methane.

Question 8

Which of the following is the correct balanced 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 9

A student needs to prepare $$250.0\ \mathrm{mL} of$$ $$0.100\ \mathrm{M}$$ NaCl solution. How many grams of NaCl are required? ($$\mathrm{Molar\ mass\ of\ NaCl} = 58.44\ \mathrm{g/mol})$$

Accepted Answer

$$1.46\ \mathrm{g}$$

Question 10

Which of the following laboratory safety practices is required at all times when handling chemicals?

Accepted Answer

Wearing chemical vapor resistant goggles and a knee-length lab coat.

Question 11

Which of the following best describes the difference between an ionic and a covalent bond?

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Question 12

A reaction has an enthalpy change $$\Delta H = -125\ \mathrm{kJ}. $$Which statement is true about this reaction?

Accepted Answer

The reaction is exothermic and releases heat to the surroundings.

Question 13

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

Accepted Answer

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

Question 14

A $$5.00\ \mathrm{g}$$ sample of magnesium reacts with excess hydrochloric acid to produce hydrogen gas according to the equation: $$\mathrm{Mg} + 2\mathrm{HCl} \rightarrow \mathrm{$$MgCl_2$$} + \mathrm{H_2$}. $$How many liters of hydrogen gas at STP ($$0^\circ\mathrm{C}$$, $$1\ \mathrm{atm}) $$are produced? ($$\mathrm{Molar\ mass\ of\ Mg} = 24.31\ \mathrm{g/mol}$$, $$1\ \mathrm{mol\ gas} = 22.4\ \mathrm{L} at $$STP)

Accepted Answer

$$4.60\ \mathrm{L}$$

Question 15

Which of the following is a correct statement about the periodic trends in atomic radius?

Accepted Answer

Atomic radius decreases from left to right across a period.

Question 16

Which of the following is the correct name for $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 17

A student is asked to design an experiment to determine the density of an unknown liquid. Which of the following is the best procedure?

Accepted Answer

Measure the mass of a known volume of the liquid and calculate density using $$\mathrm{density} = \frac{\mathrm{mass}}{\mathrm{volume}}.$$

Question 18

Which of the following best describes the role of a catalyst in a chemical reaction?

Accepted Answer

A catalyst increases the rate of reaction by providing an alternative pathway with lower activation energy.

Question 19

Which of the following is a correct example of dimensional analysis for converting $$25.0\ \mathrm{cm} to $$inches? ($$1\ \mathrm{in} = 2.54\ \mathrm{cm})$$

Accepted Answer

$$25.0\ \mathrm{cm} 	imes \frac{1\ \mathrm{in}}{2.54\ \mathrm{cm}}$$

General Chemistry ICHEM-1411 Syllabus and Course Structure Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard