Q: Which of the following is a correct application of dimensional analysis to convert 5.0 kilometers to meters?

$$5.0\ \mathrm{km} \times \frac{1000\ \mathrm{m}}{1\ \mathrm{km}} = 5000\ \mathrm{m}$$

Question 1

Which of the following best describes a chemical property?

Accepted Answer

The ability of a substance to react with oxygen to form an oxide.

Question 2

A sample contains sand, salt, and water. Which classification best describes this mixture?

Accepted Answer

Heterogeneous mixture

Question 3

How many significant figures are in the measurement 0.004560 kg?

Accepted Answer

4

Question 4

A student measures the mass of a metal cylinder as 13.5 g and its volume as 5.0 mL. What is the density of the cylinder, and how many significant figures should the answer have?

Accepted Answer

$$2.7\ \mathrm{g/mL}$$, 2 significant figures

Question 5

Which of the following is the correct nuclide symbol for an atom with 17 protons, 18 neutrons, and 18 electrons?

Accepted Answer

$$^{35}\mathrm{Cl}^{-}$$

Question 6

Which of the following elements is a diatomic molecule in its natural state?

Accepted Answer

Nitrogen

Question 7

Calculate the average atomic mass of an element with two isotopes: 60.0% $$^{63}\mathrm{Cu} ($$mass = 62.93 u) and 40.0% $$^{65}\mathrm{Cu} ($$mass = 64.93 u).

Accepted Answer

$$63.73\ \mathrm{u}$$

Question 8

Which of the following correctly describes the relationship between wavelength ($$\lambda$$), frequency ($$
u$$), and the speed of light ($$c$$)?

Accepted Answer

$$c = \lambda 
u$$

Question 9

Which electron transition in the hydrogen atom would emit the highest energy photon?

Accepted Answer

From $$n=3 to$$ $$n=1$$

Question 10

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 11

Which of the following ions is isoelectronic with argon ($$\mathrm{Ar}$$)?

Accepted Answer

$$\mathrm{Ca}^{2+}$$

Question 12

Which element has the highest first ionization energy?

Accepted Answer

Neon

Question 13

Which of the following statements about atomic radius is correct?

Accepted Answer

Atomic radius increases down a group and decreases across a period.

Question 14

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$). How many moles of glucose are present?

Accepted Answer

$$0.500$$ moles

Question 15

Which of the following best explains why metals tend to form cations?

Accepted Answer

Metals have low ionization energies and lose electrons to achieve a stable electron configuration.

Question 16

Which of the following is the correct condensed electron configuration for bromine ($$\mathrm{Br}$$, atomic number 35)?

Accepted Answer

$$[\mathrm{Ar}]\ 4s^2$\ 3d$$^{10}$$\ 4p^5$

Question 17

A hospital laboratory needs to prepare 250 mL of a saline solution using a stock solution with a concentration of $$2.0\ \mathrm{mol/L}. $$How many moles of solute are required?

Accepted Answer

Question 18

Which of the following best describes the trend in effective nuclear charge ($$Z_{\mathrm{eff}}) $$across a period from left to right?

Accepted Answer

$$Z_{\mathrm{eff}}$$ increases due to increasing nuclear charge with similar shielding.

Question 19

Which of the following is a correct application of dimensional analysis to convert 5.0 kilometers to meters?

Accepted Answer

$$5.0\ \mathrm{km} 	imes \frac{1000\ \mathrm{m}}{1\ \mathrm{km}} = 5000\ \mathrm{m}$$

General Chemistry I: Exam 1 Study Guide (Chapters 1–3)

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