Question 1

According to the Rutherford nuclear-atom model, where are the protons and neutrons located within an atom?

Accepted Answer

They reside in the nucleus at the center of the atom.

Question 2

All atoms of a given element have the same number of which subatomic particle?

Accepted Answer

Protons

Question 3

An atom of $$^{132}_{54}\mathrm{Xe}$$ contains how many neutrons?

Accepted Answer

78

Question 4

Which of the following pairs represents isotopes of the same element?

Accepted Answer

$$^{14}_{6}\mathrm{X}$$ and $$^{12}_{6}\mathrm{X}$$

Question 5

Silver has two naturally occurring isotopes: $$^{107}\mathrm{Ag} (106.90509 $$amu) and $$^{109}\mathrm{Ag} (108.9047 $$amu). The average atomic mass of silver is 107.8682 amu. What is the fractional abundance of the lighter isotope?

Accepted Answer

0.51835

Question 6

Element X has three naturally occurring isotopes with the following data: 5.07% $$^{38}\mathrm{X} (37.919 $$amu), 15.35% $$^{39}\mathrm{X} (39.017 $$amu), and 79.85% $$^{42}\mathrm{X} (42.111 $$amu). What is the average atomic mass of element X?

Accepted Answer

41.54 amu

Question 7

Which pair of elements would you expect to have the most similar chemical and physical properties?

Accepted Answer

O and S

Question 8

Which of the following does NOT occur as a diatomic molecule in its elemental form?

Accepted Answer

Sulfur

Question 9

Which of the following compounds is most likely to be ionic?

Accepted Answer

$$\mathrm{CaO}$$

Question 10

Which pair of elements is most apt to form an ionic compound with each other?

Accepted Answer

Barium and bromine

Question 11

The charge on the copper ion in the salt $$\mathrm{CuO} is$$:

Accepted Answer

$$+2$$

Question 12

Which of the following formula/name pairs is incorrect?

Accepted Answer

$$\mathrm{Fe}_2(\mathrm{SO}_4)_3 / $$iron(III) sulfide

Question 13

What is the empirical formula of a compound with molecules containing 12 carbon atoms, 14 hydrogen atoms, and 6 oxygen atoms?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_7\mathrm{O}_3$$

Question 14

Aluminum reacts with a certain nonmetallic element to form a compound with the general formula $$\mathrm{Al}_2\mathrm{X}_3. $$Element X must be from which group of the Periodic Table?

Accepted Answer

Group 6A

Question 15

Which of the following is the correct name for $$\mathrm{N}_2\mathrm{O}_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 16

Which of the following ions is an isotope of $$^{39}\mathrm{Cl}$$?

Accepted Answer

$$^{36}\mathrm{Cl}^-$$

Question 17

An ion has 8 protons, 9 neutrons, and 10 electrons. What is the symbol for this ion?

Accepted Answer

$$^{17}\mathrm{O}^{2-}$$

Question 18

A metal forms a salt with the formula $$\mathrm{XCl}_2. $$The X-ion in this salt has 27 electrons. What is the metal X?

Accepted Answer

Cu

Question 19

Element M reacts with fluorine to form an ionic compound with the formula $$\mathrm{MF}_3. $$The M-ion has 22 electrons. What is element M?

Accepted Answer

Mn

Question 20

Which of the following is the correct formula for cadmium arsenate?

Accepted Answer

$$\mathrm{Cd}_3(\mathrm{AsO}_4)_2$$

General Chemistry Chapter 2 Review – Step-by-Step Study Guidance

Guida di studio - Domande di pratica

Study guide - Flashcard