Charge: 0, Mass: $$1.67 \times 10$$^{-27}$$ kg

Question 1

Which of the following statements is NOT part of Dalton's atomic theory?

Accepted Answer

Atoms can be divided into smaller particles called electrons, protons, and neutrons.

Question 2

Which experiment provided evidence for the existence of the electron?

Accepted Answer

J.J. Thomson's cathode ray tube experiment

Question 3

What is the charge and approximate mass of a neutron?

Accepted Answer

Charge: 0, Mass: $$1.67 	imes 10$$^{-27}$$ kg

Question 4

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with the same number of protons but different numbers of neutrons.

Question 5

What is the formula for the compound formed from magnesium and nitrogen?

Accepted Answer

$$\mathrm{Mg_3N_2}$$

Question 6

Which of the following is a binary covalent compound?

Accepted Answer

Dinitrogen monoxide ($$\mathrm{N_2O})$$

Question 7

What is the wavelength (in nm) of light with a frequency of $$9.76 	imes 10$$^{13}$$ Hz? (Speed of light c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$3073 nm$$

Question 8

Which law states that a chemical compound always contains the same proportion of elements by mass?

Accepted Answer

Law of constant composition

Question 9

Which of the following best describes the result of Rutherford's gold foil experiment?

Accepted Answer

Most alpha particles passed through, but some were deflected, indicating a small, dense nucleus.

Question 10

What is the minimum amount of energy required to eject an electron from a metal surface according to the photoelectric effect?

Accepted Answer

$$E = h 
u$$

Question 11

Which of the following is the correct formula for lithium phosphate?

Accepted Answer

$$\mathrm{Li_3PO_4}$$

Question 12

Which statement about the Bohr model of the hydrogen atom is correct?

Accepted Answer

Electrons occupy stationary states and emit or absorb photons when transitioning between these states.

Question 13

Which of the following is the correct name for $$\mathrm{$$FeCl_2$$}$$?

Accepted Answer

Iron(II) chloride

Question 14

What is the energy of a photon with a wavelength of $$450 nm$$? ($$h = 6.626 	imes 10$$^{-34}$$ J·s, c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$4.42 	imes 10$$^{-19}$$ J

Question 15

Which of the following is a correct statement about ions?

Accepted Answer

An ion is an atom or group of atoms that carries a net positive or negative charge.

Question 16

Which of the following best describes the photoelectric effect?

Accepted Answer

Electrons are ejected from a metal surface when exposed to light of sufficient frequency.

Question 17

According to Heisenberg's Uncertainty Principle, which of the following is true?

Accepted Answer

It is impossible to know both the exact position and momentum of an electron simultaneously.

Question 18

Which of the following is the correct formula for strontium bromate?

Accepted Answer

$$\mathrm{Sr($$BrO_3$$)_2}$$

Question 19

Which of the following is a correct conclusion by Max Planck regarding energy?

Accepted Answer

Energy is quantized and can only be emitted in discrete packets called quanta.

Introduction to Atomic Structure and Basic Chemical Principles

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