Question 1

Which of the following best describes the difference between a chemical change and a physical change? Consider the example of boiling water and burning wood.

Accepted Answer

Boiling water is a physical change because the water changes state but not composition, while burning wood is a chemical change because new substances are produced.

Question 2

A student measures the mass of a sample as $$12.30 g $$and its volume as $$4.1 mL. $$What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$3.0 g/mL$$

Question 3

Which of the following statements about atomic theory and periodic trends is correct?

Accepted Answer

Ionization energy generally decreases down a group because electrons are farther from the nucleus.

Question 4

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

Accepted Answer

Salt water

Question 5

What is the correct name for the compound with the formula $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 6

Balance the following chemical equation and determine the number of moles of $$\mathrm{CO_2$}$$ produced when $$2$$ moles of $$\mathrm{C_2H_6}$$ are combusted:

$$\mathrm{C_2H_6} + O_2$ \rightarrow CO_2$ + H_2O$$

Accepted Answer

$$4$$ moles of $$\mathrm{CO_2$}$$

Question 7

A reaction releases $$150 kJ of $$heat. According to thermochemical conventions, which of the following statements is correct?

Accepted Answer

The reaction is exothermic and $$q = -150 kJ.$$

Question 8

A sample of gas occupies $$5.00 L at$$ $$1.00$$ atm and $$300 K. $$What will be its volume at $$2.00$$ atm and $$300 K$$? (Assume ideal gas behavior.)

Accepted Answer

$$2.50 L$$

Question 9

Which of the following is the correct Lewis structure for $$\mathrm{CO_2$}$$?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 10

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Azimuthal quantum number ($$l)$$

Question 11

A student needs to prepare $$250 mL of a$$ $$0.100 M$$ $$\mathrm{NaCl}$$ solution. How many grams of $$\mathrm{NaCl}$$ are required? ($$M_{\mathrm{NaCl}} = 58.44 g/$$mol)

Accepted Answer

$$1.46 g$$

Question 12

Which of the following statements about ionic and molecular compounds is correct?

Accepted Answer

Ionic compounds are composed of metals and nonmetals, while molecular compounds are composed of only nonmetals.

Question 13

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

Accepted Answer

They have a complete valence electron shell, making them stable.

Question 14

A laboratory procedure requires you to dilute $$10.0 mL of a$$ $$2.00 M $$solution to a final volume of $$100.0 mL. $$What is the final concentration?

Accepted Answer

$$0.200 M$$

Question 15

Which of the following is a correct application of the mole concept in a real-world scenario?

Accepted Answer

A chemist calculates the mass of $$\mathrm{H_2O}$$ produced from $$2$$ moles of $$\mathrm{O_2$} in $$the reaction $$2\mathrm{H_2$} + \mathrm{O_2$} \rightarrow 2\mathrm{H_2O}.$$

Question 16

Which of the following best describes the relationship between pressure and volume for a fixed amount of gas at constant temperature (Boyle's Law)?

Accepted Answer

$$P \propto \dfrac{1}{V}$$

Question 17

Which of the following laboratory practices best demonstrates accurate measurement and data recording?

Accepted Answer

Recording all measurements immediately in a bound laboratory notebook with units and significant figures.

Question 18

Which of the following is the correct electron configuration for a neutral oxygen atom ($$Z=8$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 19

A sample of nitrogen gas ($$\mathrm{N_2$}) is $$collected over water at $$25^\circC $$and $$1.00$$ atm. If the vapor pressure of water at $$25^\circC is$$ $$0.0313$$ atm, what is the partial pressure of nitrogen gas?

Accepted Answer

$$0.969$$ atm

CHEM 107: General Chemistry I – Course Syllabus and Study Guide Overview

Guida di studio - Domande di pratica

Study guide - Flashcard