Chemistry 101

Chapter 2 :  Atoms, Molecules, and Ions

&nbsp;&nbsp;
1) What is the symbol for an ion with 17 protons, 18 neutrons, and 18 electrons?

&nbsp;A. 32S -2 &nbsp;

&nbsp;&nbsp;B. 34S -2 &nbsp;&nbsp;

&nbsp;&nbsp;C. 35Cl- &nbsp;

&nbsp;D. 56Fe-2&nbsp;

&nbsp;2) Changing the number of neutrons of an atom change its:&nbsp;

&nbsp;A. isotope &nbsp;

&nbsp;&nbsp;B. element &nbsp;

&nbsp;C. ion &nbsp;

&nbsp;D. charge &nbsp;

&nbsp;E. molecules &nbsp;&nbsp;

&nbsp;&nbsp;
3) The mass number is equal to : &nbsp;

&nbsp;&nbsp;
A. The sum of the sum of the electrons and protons. &nbsp;

&nbsp;&nbsp;
B. The sum of the sum of the neutrons and electrons. &nbsp;

&nbsp;&nbsp;
C. The sum of the number of protons, neutrons, and electrons.&nbsp;

&nbsp;&nbsp;
D. The sum of the number of protons and neutrons. &nbsp;&nbsp;

&nbsp;&nbsp;
4) What element is defined by the following information?
p+ = 11 n° = 12 e- = 11 &nbsp;

&nbsp;A. Zirconium &nbsp;&nbsp;

&nbsp;&nbsp;B. Calcium &nbsp;&nbsp;

&nbsp;C. Potassium &nbsp;&nbsp;

&nbsp;D. Neon &nbsp;

&nbsp;&nbsp;E. Argon&nbsp;

&nbsp;&nbsp;5) Determine the number of protons, neutrons and electrons in the following:<img src="https://gateway.medhemmeh.com/downloads/67194d8c1dbdd53b5e6eb93c/84h932u7nn" width="128" height="143"/>

A. p+ = 18 n° = 18 e- = 22

&nbsp;&nbsp;&nbsp;B. p+ = 18 n° = 22 e- = 18&nbsp;

C. p+ = 22 n° = 18 e- = 18 &nbsp;

&nbsp;&nbsp;D. p+ = 18 n° = 22 e- = 40&nbsp;

&nbsp;&nbsp;
E. p+ = 40 n° = 22 e- = 18

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6) Which of the following statements about isotopes is TRUE?

&nbsp;&nbsp;
A. Isotopes of the same element differ only in the number of electrons they contain. &nbsp;

&nbsp;&nbsp;
B. An isotope of an atom with a larger number of neutrons is larger than an isotope of the same atom that contains fewer neutrons.

&nbsp;&nbsp;
C. Isotopes of the same element have the same mass.

&nbsp;&nbsp;
D. Isotopes of the same element don't usually have the same properties.

&nbsp;&nbsp;
E. Some elements have 3 or more naturally occurring isotopes.

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7) Which one of the following is correct:

&nbsp;&nbsp;
A. The name of Cu3N2 is copper (II) nitrite.

&nbsp;&nbsp;
B. The name of Cu3N2 is copper (II) nitrite.

&nbsp;&nbsp;
C. The name of CrO3 is chromium (VI) oxide.

&nbsp;&nbsp;
D. The name of Cr2O3 is dichromium trioxide.

&nbsp;&nbsp;
E. The name of MnO2 is manganese (II) oxide.

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8) The name of Ca2N3 is:

&nbsp;&nbsp;
A. calcium nitride

&nbsp;&nbsp;
B. dicalcium trinitride

&nbsp;&nbsp;
C. calcium nitrite

&nbsp;&nbsp;
D. calcium nitrate

&nbsp;&nbsp;
E. it is wrong formula

&nbsp;&nbsp;
9) The chemical formula of calcium nitride is:

&nbsp;&nbsp;
A. CaN

&nbsp;&nbsp;
B. Ca2N

&nbsp;&nbsp;
C. CaN2

&nbsp;&nbsp;
D. Ca3N2

&nbsp;&nbsp;
E. Ca3N3

&nbsp;&nbsp;
10) The name of MgO2 is:

&nbsp;A. magnesium sulfate &nbsp;

&nbsp;B. &nbsp;magnesium oxide&nbsp;

&nbsp;C. magnesium peroxide&nbsp;

&nbsp;D. &nbsp;magnesium dioxygen &nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;E. None of the above &nbsp;

&nbsp;&nbsp;
11) Which of the following compounds would you expect to be ionic: NO2, AlCl3, NF3, BF3, C2H4O2:

&nbsp;A. NO2 &nbsp;

&nbsp;B. NF3, AlCl3 &nbsp;

&nbsp;C. BF3, C2H4O2, AlCl3 &nbsp;&nbsp;

&nbsp;&nbsp;
D. BF3, AlCl3&nbsp;

&nbsp;&nbsp;
12) The name of Mg3P2 is:

&nbsp;&nbsp;
A) Magnesium phosphide

&nbsp;&nbsp;
B) Magnesium sulfate

&nbsp;&nbsp;
C) Magnesium phosphate

&nbsp;&nbsp;
D) None of the options is correct

&nbsp;&nbsp;
E) Magnesium phosphite

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13) The chemical formula of sodium oxide is:

&nbsp;A. NaO &nbsp;&nbsp;

&nbsp;B. NaO2 &nbsp;

&nbsp;C. Na2O2 &nbsp;

&nbsp;D. Na2O&nbsp;

&nbsp;&nbsp;
14) Which combination of formula/name is incorrect?

&nbsp;&nbsp;
A. FeO / iron (II) oxide&nbsp;

&nbsp;&nbsp;
B. Fe2S3 / iron (III) sulfide &nbsp;&nbsp;

&nbsp;&nbsp;
C. Cr3P / chromium (II) phosphide

&nbsp;&nbsp;
D. &nbsp;KMnO4 / potassium permanganate &nbsp;

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15) The name of Cu3PO4 is:&nbsp;

&nbsp;&nbsp;
A. copper (I) phosphate

&nbsp;&nbsp;
B. copper (II) phosphate

&nbsp;&nbsp;
C. copper (III) phosphat

&nbsp;&nbsp;
D. copper phosphate

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16) Which of the following is the formula of Hydrobromic acid? &nbsp;

&nbsp;&nbsp;
A. KBr

&nbsp;&nbsp;
B. HBr&nbsp;

&nbsp;&nbsp;
C. HBrO&nbsp;

&nbsp;&nbsp;
D. HBrO3&nbsp;

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17) &nbsp;The name of HCLO2 is:&nbsp;

&nbsp;&nbsp;
A. hydrochloric acid &nbsp;&nbsp;

&nbsp;&nbsp;B. chlorous acid &nbsp;&nbsp;

&nbsp;C. hypochlorous acid &nbsp;

&nbsp;&nbsp;
D. perchloric acid &nbsp;

&nbsp;&nbsp;
18) Write the formula of disulfurdinitride:

&nbsp;A. S2N &nbsp;&nbsp;

&nbsp;B. S3N2 &nbsp;

&nbsp;C. S2N2 &nbsp;

&nbsp;D. S4N2 &nbsp;

&nbsp;&nbsp;
19) The formula of ammonium carbonate is:

&nbsp;A. (NH4)2CO3 &nbsp;&nbsp;

&nbsp;B. NH4CO2 &nbsp;&nbsp;

&nbsp;C. (NH3)2CO &nbsp;

&nbsp;D. (NH3)2CO3 &nbsp;

&nbsp;&nbsp;
E. N2(CO3)3

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20) Which of the following is not correctly named?

&nbsp;&nbsp;
A. Pb(NO3)2, lead (II) nitrate

&nbsp;&nbsp;
B. Mg(OH)2, magnesium hydroxide

&nbsp;&nbsp;
C. H3PO4, phosphoric acid

&nbsp;&nbsp;
D. NH4ClO4, ammonium chlorate

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21) Which of the following pair of elements would most likely form an ionic compound?&nbsp;

&nbsp;A. Al and Rb &nbsp;

&nbsp;B. I and Rb &nbsp;

&nbsp;C. Cl and I &nbsp;&nbsp;

&nbsp;D. C and S&nbsp;

&nbsp;&nbsp;
22) The charge on the iron ion in the salt Fe2O3 is:

&nbsp;&nbsp;
A) +1

&nbsp;&nbsp;
B) +2

&nbsp;&nbsp;
C) +3

&nbsp;&nbsp;
D) -5

&nbsp;&nbsp;
E) -6&nbsp;

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23) Identify a cation :

&nbsp;&nbsp;
A) An atom that has lost an electron.

&nbsp;&nbsp;
B) An atom that has gained an electron

&nbsp;&nbsp;
C) An atom that has lost a proton.

&nbsp;&nbsp;
D) An atom that has gained a proton.

&nbsp;&nbsp;
24) Which of the following elements is NOT a metal?

&nbsp;A) Ba &nbsp;

&nbsp;B) Mg &nbsp;

&nbsp;C) Xe &nbsp;

&nbsp;D) Pb&nbsp;

&nbsp;&nbsp;
25) Which of the following elements is a metal?&nbsp;

&nbsp;A. As &nbsp;&nbsp;

&nbsp;B. C &nbsp;&nbsp;

&nbsp;C. I &nbsp;&nbsp;

&nbsp;D. Sn &nbsp;&nbsp;

&nbsp;&nbsp;
26) Which of the following elements is a nonmetal?

&nbsp;A. Zn &nbsp;

&nbsp;B. Cs &nbsp;&nbsp;

&nbsp;C. Ca &nbsp;&nbsp;

&nbsp;D. Co &nbsp;&nbsp;