Question 1

Which of the following is an example of a chemical process?

Accepted Answer

Rusting of a nail.

Question 2

A certain liquid has a density of $$2.67\ \mathrm{g/cm^3$}. $$What volume in liters would $$1340\ \mathrm{g} of $$this liquid occupy?

Accepted Answer

$$0.502$$

Question 3

How many significant figures does the value $$450.00$$ have?

Accepted Answer

5

Question 4

Convert $$8.65 	imes 10^9$\ \mathrm{m^2$} to$$ $$\mathrm{km^2$}.$$

Accepted Answer

$$8.65 	imes 10^3$

Question 5

Which statement best describes the law of constant proportion?

Accepted Answer

The type of elements and their ratio to one another is constant for a specific compound/molecule.

Question 6

There are ________ electrons, ________ protons, and ________ neutrons in an atom of Xe.

Accepted Answer

54, 54, 78

Question 7

When a metal and a nonmetal react, the __________ tends to lose electrons and the __________ tends to gain electrons.

Accepted Answer

metal, nonmetal

Question 8

In general, as you go across a period in the periodic table from left to right: (1) effective nuclear charge _________; (2) the atomic radius __________; (3) the first ionization energy __________.

Accepted Answer

increases, decreases, increases

Question 9

Which of the following does NOT have eight valence electrons?

Accepted Answer

B$$^{3+}$$

Question 10

A nonpolar bond will form between two _____ atoms of _____ electronegativity.

Accepted Answer

identical, equal

Question 11

Which of the following bonds is the least polar, given the electronegativities: C (2.5), O (3.5), F (4.0), Na (0.9), S (2.5)?

Accepted Answer

S—O

Question 12

The formal charge on sulfur in $$\mathrm{SO_4$^{2-}} is$$:

Accepted Answer

0

Question 13

A non-electrolyte is defined as:

Accepted Answer

A substance that does not ionise in solution and no electrical conduction takes place.

Question 14

Identify the insoluble compound from the following examples:

Accepted Answer

Fe(OH)$$_3$$

Question 15

When an aqueous solution is formed with each of the following reagents, which solution will contain the greatest concentration of ions?

Accepted Answer

Na$$_3PO$_4$$

Question 16

In a basic solution:

Accepted Answer

$$[\mathrm{H_3O^+}] \u003c [\mathrm{OH^-}]$$

Question 17

Which element has the greatest electronegativity in the periodic table?

Accepted Answer

Fluorine

Question 18

Which noble gas does NOT have a full octet?

Accepted Answer

Helium

Question 19

Which element is present in both metal oxides and non-metal oxides?

Accepted Answer

Oxygen

Question 20

Which of the following is a metalloid commonly used as a semiconductor in electrical circuits?

Accepted Answer

Silicon

Comprehensive Study Guidance for GOB Chemistry Mock Exam

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