Question 1

Which of the following best describes the difference between atomic mass and molar mass?

Accepted Answer

Atomic mass is the mass of a single atom in amu, while molar mass is the mass of one mole of atoms in grams.

Question 2

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of water. What is the mass of this sample? (Molar mass of H_2O = 18.0$ g/mol)

Accepted Answer

$$9.0 g$

Question 3

Which of the following statements about the Bohr model of the atom is correct?

Accepted Answer

Electrons orbit the nucleus in fixed paths and can only absorb or emit energy when moving between these paths.

Question 4

Which of the following equations correctly relates the energy of a photon to its frequency?

Accepted Answer

$$E = h 
u$$

Question 5

A photon has a wavelength of $$4.00 	imes 10$$^{-7}$$ m. What is its energy? (h = 6.626$$ 	imes $$10^{-34} J$$·s, $$c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$$4.97 	imes 10$$^{-19}$$ J

Question 6

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 7

Which of the following electron configurations is NOT possible for a neutral atom in its ground state?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^2$$\ $$3d^{12}$$

Question 8

Which of the following elements has the highest first ionization energy?

Accepted Answer

Neon ($$Ne)$$

Question 9

Which of the following best explains why fluorine is more electronegative than chlorine?

Accepted Answer

Fluorine has a smaller atomic radius, so its valence electrons are closer to the nucleus.

Question 10

Which of the following molecules is nonpolar?

Accepted Answer

$$CO_2$$

Question 11

Which of the following statements about the photoelectric effect is correct?

Accepted Answer

Electrons are emitted from a metal surface only if the light has a frequency above a certain threshold.

Question 12

Which of the following is the correct formula for the de Broglie wavelength of a particle?

Accepted Answer

$$\lambda = \dfrac{h}{mv}$$

Question 13

Which of the following pairs of elements are both metals?

Accepted Answer

Sodium and Magnesium

Question 14

Which of the following best describes the Pauli Exclusion Principle?

Accepted Answer

No two electrons in an atom can have the same set of four quantum numbers.

Question 15

Which of the following is the correct order of increasing atomic radius?

Accepted Answer

Cl \u003c S \u003c P

Question 16

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two nonmetals.

Question 17

Which of the following is the correct Lewis structure for $$CO_2$$?

Accepted Answer

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

Question 18

Which of the following statements about Hund's Rule is correct?

Accepted Answer

Electrons occupy degenerate orbitals singly before pairing.

Question 19

Which of the following best explains why metals are good conductors of electricity?

Accepted Answer

Metals have delocalized electrons that can move freely throughout the structure.

Question 20

Which of the following is the correct relationship for the Heisenberg Uncertainty Principle?

Accepted Answer

$$\Delta x \cdot \Delta p \geq \dfrac{h}{4\pi}$$

General Chemistry I: Midterm Exam 1 Study Guide

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