Question 1

A student measures the mass of a sample as 12.30 g and its volume as 4.5 mL. What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$2.7\ \mathrm{g/mL}$$

Question 2

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 3

Which set of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

$$n=2,\ l=2,\ m_l=0,\ m_s=+\frac{1}{2}$$

Question 4

Which element has the highest first ionization energy?

Accepted Answer

Neon ($$\mathrm{Ne})$$

Question 5

What is the electron configuration for the oxide ion ($$\mathrm{O$$^{2-}$$}$$)?

Accepted Answer

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

Question 6

Which of the following compounds is ionic?

Accepted Answer

$$\mathrm{NaCl}$$

Question 7

Which molecule has a trigonal planar molecular geometry?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 8

What is the formal charge on the central atom in the best Lewis structure for $$\mathrm{NO_3$^-}$$?

Accepted Answer

$$0$$

Question 9

Which hybridization corresponds to a carbon atom in ethene ($$\mathrm{C_2H_4}$$)?

Accepted Answer

$$sp^2$$

Question 10

A reaction has a theoretical yield of 10.0 g, but only 7.5 g of product is isolated. What is the percent yield?

Accepted Answer

$$75\%$$

Question 11

How many moles of $$\mathrm{NaCl}$$ are present in $$250\ \mathrm{mL} of a$$ $$0.20\ \mathrm{M}$$ solution?

Accepted Answer

$$0.050\ \mathrm{mol}$$

Question 12

Which of the following is a redox reaction?

Accepted Answer

$$\mathrm{Zn(s) + $$CuSO_4$$(aq) \rightarrow $$ZnSO_4$$(aq) + Cu(s)}$$

Question 13

A coffee-cup calorimeter is used to measure the enthalpy change of a reaction at constant pressure. Which equation is used to calculate the enthalpy change?

Accepted Answer

$$\Delta H = q_p$$

Question 14

Which of the following statements about the kinetic molecular theory of gases is FALSE?

Accepted Answer

Gas particles lose energy when they collide with each other.

Question 15

A mixture of $$\mathrm{O_2$}$$ and $$\mathrm{N_2$}$$ gases has a total pressure of $$1.0\ \mathrm{atm}. If $$the partial pressure of $$\mathrm{O_2$} is$$ $$0.30\ \mathrm{atm}$$, what is the partial pressure of $$\mathrm{N_2$}$$?

Accepted Answer

$$0.70\ \mathrm{atm}$$

Question 16

Which gas will effuse the fastest under identical conditions?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 17

Which of the following best explains why the atomic radius decreases across a period from left to right?

Accepted Answer

The effective nuclear charge increases, pulling electrons closer to the nucleus.

Question 18

Given the reaction: $$\mathrm{2H_2(g) + O_2$(g) \rightarrow 2H_2O(l)}$$, if $$4.0\ \mathrm{mol} of$$ $$\mathrm{H_2$}$$ and $$2.0\ \mathrm{mol} of$$ $$\mathrm{O_2$}$$ are mixed, what is the limiting reactant?

Accepted Answer

$$\mathrm{O_2$}$$

Question 19

Which of the following is the correct expression for the combined gas law?

Accepted Answer

$$\frac{P_1V_1}{T_1$} = \frac{P_2V_2}{T_2$}$$

CH101-003 Spring 2026 Final Exam Study Guide: Comprehensive Review of General Chemistry Topics

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