Q: Which of the following is the correct formula for calculating the heat ($$q) $$absorbed or released during a temperature change?

$$q = m \times c \times \Delta T$$

Question 1

Which of the following best describes the difference between a chemical property and a physical property?

Accepted Answer

A chemical property describes a substance's ability to undergo chemical changes, while a physical property can be observed or measured without changing the substance's identity.

Question 2

Which equation correctly represents the relationship between mass, volume, and density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 3

A student mixes two clear solutions in a beaker and observes the formation of a white solid. This is an example of:

Accepted Answer

A chemical change, because a new substance (precipitate) was formed.

Question 4

Which of the following is NOT a requirement for safe laboratory practice according to the course materials?

Accepted Answer

Wearing loose-fitting sleeves and tops.

Question 5

Which of the following best describes the kinetic-molecular theory of gases?

Accepted Answer

Gases consist of particles that are in constant, random motion and collisions between them are perfectly elastic.

Question 6

Which of the following is the correct balanced chemical equation for the combustion of methane ($$CH_4) in $$oxygen?

Accepted Answer

$$CH_4 + 2O_2$$ \rightarrow $$CO_2 + 2H_2O$

Question 7

A student needs to prepare 250 mL of a 0.5 M NaCl solution. How many moles of NaCl are required?

Accepted Answer

$$0.125$$ moles

Question 8

Which statement about atomic structure is correct?

Accepted Answer

Protons and neutrons are located in the nucleus, while electrons occupy orbitals around the nucleus.

Question 9

Which of the following is the correct formula for calculating the heat ($$q) $$absorbed or released during a temperature change?

Accepted Answer

$$q = m 	imes c 	imes \Delta T$$

Question 10

Which of the following is an example of a physical change?

Accepted Answer

Melting of ice.

Question 11

Which law states that energy cannot be created or destroyed, only transformed from one form to another?

Accepted Answer

First Law of Thermodynamics

Question 12

A sample of gas occupies 2.0 L at 1.0 atm. If the pressure is increased to 2.0 atm at constant temperature, what will be the new volume?

Accepted Answer

$$1.0 L$$

Question 13

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

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

Question 14

Which of the following is the correct formula for calculating the number of moles from mass and molar mass?

Accepted Answer

$$n = \frac{m}{M}$$

Question 15

Which statement about nuclear chemistry is correct?

Accepted Answer

Nuclear reactions involve changes in the nucleus, such as the number of protons and neutrons.

Question 16

Which of the following is the correct formula for the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 17

A student is asked to determine the empirical formula of a compound containing 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula?

Accepted Answer

$$CH_2O$$

Question 18

Which of the following is the correct definition of stoichiometry?

Accepted Answer

The calculation of quantities of reactants and products in chemical reactions.

Question 19

Which of the following is a correct statement about valence electrons?

Accepted Answer

Valence electrons are responsible for chemical bonding and are found in the outermost shell.

Question 20

Which of the following is the correct formula for calculating percent yield in a chemical reaction?

Accepted Answer

$$	ext{Percent Yield} = \frac{	ext{Actual Yield}}{	ext{Theoretical Yield}} 	imes 100\%$$

General Chemistry I for Majors (CHEM-1204) Syllabus and Study Guide

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