Chem Exam II
2
How many electrons are in a single bond a. 1 b. 2 c. 4 d. 6
24
How many total valence electrons are used in this lewis dot structure a. 24 b. 12 c. 17 d. 22
+2
What is the charge of the cation in MgO a. +2 b. +1 c. +4 d. +6
Co₂(SO₄)₃
What is the formula of Cobalt (III) Sulfate? a. CoSO₄ b. Co₂(SO₄)₃ c. Co₃(SO₄)₂ d. Co₃SO₄
CaF₂
What is the formula of the compound formed by calcium and fluorine? a. CaF b. CaF₂ c. CaF₃ d. Ca₂F
Iron (III) Carbonate
What is the systematic name for Fe₂(CO₃)₃? a. Iron Carbonate b. Diiron Tricarbonate c. Iron (III) Carbonate d. Iron (II) Carbonate
neon
Which of the following atoms doesn't form an ion? a. fluorine b. magnesium c. neon d. sodium
H₂O
Which of the following compound is polar? A. H₂O B. CO₂ C. CCL₄ D. CH₄
N₂O₅
Which of the following is the correct formula for dinitrogen pentoxide A. O₂N₅ B. O₅N₂ C. N₂O₅ D. N₅O₂
62%
[C=12.01, H=1.01, Cl=35.45] C₂H₆(g) + Cl₂(g) (ethane) → C₂H₅Cl(L) +HCl(g) (ethyl chloride) when 5.6g of ethane is reacted with excess chlorine, 7.4g of ethyl chloride forms. Calculte the percent yield of ethyl chloride a. 62 b. 1.6 c. 2.6 d. 74
4
a carbon atom forms how many bonds a. 4 b. 6 c. 2 d. 3
2
according to its number of valence electrons, how many bonds will oxygen atom typically form a. 1 b. 2 c. 3 d. 4
Ionic
an ______ bond forms when lithium and oxygen combine to form a compound a. hydrogen b. ionic c. non-polar covalent d. polar covalent
1.27g
how many grams of O₂ are needed to react with Aluminum to produce 2.7g of Aluminum oxide [Al=26.98, O=16.00] 4Al(s) + 3O₂(g) → 2Al₂O₃ (s)
2.1x10²⁴
how many molecules are in 3.5 moles of SO₂ [NA=6.022x10²³] a. 22.4x10²³ b. 1.7x10²³ c 1.7x10⁻²³ d. 2.1x10²⁴
2.0mol
how many moles of CHCl₃ are produced from the reactions of 6.0 moles of chlorine according to the balanced equation CH₄ (g) + 3Cl₂ (g) → CHCl₃ (l) + 3HCl (g) a. 2mol b. 6mol c. 3mol d. 18mol
2.75
how many moles of marble, CaCO₃, are there in a 275g piece of marble a. 4.57x10⁻²² b. 0.364 c. 2.75 d. 275
6.99x10²⁴
how many oxygen atoms are in 5.80 moles of SO₂ a. 6.99x10² b. 6.022x10²³ c. 11.6 d. 3.49x10²⁴
3
how many total resonance structures are possible for carbonate ion (CO₃⁻²) a. 4 b. 3 c. 2 d. 1
3
how many valence electrons does aluminum have a. 13 b. 3 c. 5 d. 7
Mg
in the following reaction, which substance is being oxidized: Mg(s) + Cu²⁺ (aq) → Mg²⁺ (aq) + Cu (s) a. Mg b. Mg²⁺ c. Cu²⁺ d. Cu
Be⁺²
predict the charges of the ions in an ionic compound containing the elements Beryllium and chlorine a. Be⁺¹ b. Be⁺² c. Be d. Be⁺³
8
the ammonium ion has the formula NH₄⁺. How many total valence electrons are used in the lewis structure of the ammonium ion a. 4 b. 5 c. 8 d. 9
Sr⁺²
the element Strontium is most likely to form which of these ions a. Sr⁺ b. Sr⁺² c. Sr⁻ d. Sr⁻²
tetrahedral
the molecular geometry of the CH₃Cl molecule is a. tetrahedral b. trigonal planar c. linear d. trigonal pyramidal
109.5°
what is the H-O bond angle in water a. 90° b. 180° c. 120° d. 109.5°
MgCl₂
which one in the following is an ionic compound a. H₂O b. CH₄ c. CO₂ d. MgCl₂
3
°How many electrons Phosphorous (P) atom gain to have octet a. 1 b. 5 c. 3 d. 4
Ag⁺ I⁻ → AgI(s)
what is the correct net ionic equation? AgNO₃ (aq) + NaI (aq) → AgI (s) + NaNO₃ (aq) a. Ag²⁺ + I₂⁻ → AgI₂ (s) b. 2NO₃⁻ + 2K → 2KNO₃ c. Ag⁺ + NO₃⁻ + Na⁺ + I⁻ → AgI (s) + Na⁺ +NO₃⁻ d. Ag⁺ + I⁻ → AgI (s)
224
what is the mass of 3.50 moles of SO₂ [S=32.07, O=16.00] a. 22.4 b. 224 c. 0.055 d. 55
100.09 g/mol
what is the molar mass of calcium carbonate CaCO₃ [Ca=40.08, C=12.01, O=16.00] a. 100.09 b. 98.09 c. 84.09 d. 57.09
nitrogen dioxide
what is the name of NO₂ a. nitrogen oxide b. nitrogen oxygen c. nitrogen dioxide d. nitrous oxide
bent
what is the shape of a H₂Te molecule a. linear b. bent c. trigonal planar d. tetrahedral
fluorine
which halogen atom is most electronegative a. bromine b. chlorine c. fluorine d. iodine
Na⁺
which is a spector ion from the following complete ionic equation: Ag⁺ (aq) + NO₃⁻ (aq) + Na⁺ (aq) + SO₄⁻² (aq) → AgSO₄ (s) + Na⁺ (aq) + NO₃⁻ (aq) a. Ag⁺ b. SO₄⁻² c. Na⁺ d. AgSO₄
O-H
which is the most polar bond in propanol a. c-h b. c-o c. o-h d. c-c
H-F
which of the following bonds is the most polar a. h-f b. h-Cl c. h-Br d. h-i
BF₃
which of the following compound is nonpolar a. CO b. BF₃ c. SO₂ d. N₂O
O
which of the following elements is most electronegative a. B b. C c. N d. O
Fe
which of the following elements is most likely to lose electrons to become a cation? a. Ar b. C c. Cl d. Fe
atomic mass units
which of the following is the correct unit for formula weight a. grams b. atomic mass units c. ounces d. pounds
a cation has more protons than electrons
which of the following is true in general of all cations a. a cation has equal numbers of protons and electrons b. a cation has fewer protons than electrons c. a cation has more protons than electrons d. a cation has more protons than neutrons
PCl₅
which of the following molecules have an atom that does not obey the octet rule a. CBr₄ b. CO₂ c. PCl₅ d. NH₃
3
what is the coefficent of oxygen gas when equation is balanced C₂H₅OH+O₂→CO₂+H₂O a. 1 b. 7 c. 5 d. 3
8
what is the coefficient of carbon dioxide gas when equation is balanced C₄H₁₀ + O₂ → CO₂ + H₂O a. 4 b. 8 c. 32 d. 10
3
what is the coefficient of sulfuric acid (H₂SO₄) when the equation is balanced Ca₃(PO₄)₂ + H₂SO₄ → CaSO₄ + H₃PO₄ a. 2 b. 6 c. 3 d. 2
barium iodide
what is the correct name for BaI₂ a. barium iodine b. barium iodide c. barium diiodide d. monobarium diiodide