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Material Type: Exam; Class: GEN CHEMISTRY I; Subject: Chemistry; University: Louisiana State University; Term: Summer 2001;
Typology: Exams
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335 cm 3 3.35 mL
33.5 mm 3
1.50 mm 3
A temperature of -37 o^ C on the Kelvin (absolute) temperature scale is
-37 o^ C + 273 = 236 K 114 K 273 K 236 K 304 K 291 K Which one of the following numbers has 4 significant figures? 0.0590 This one has 3 0.0015 This one has 2 2000.1 This one has 5
3.29 X 10 3 This one has 3
Convert the velocity of a snail (5.68 cm/min) to units of km/hr. 5.68 cm/min (60 min/hr) (1E-2 m/cm) (1 km/1E3 m) = 3.41E-3 km/hr
6.21 X 10 2 km/hr
3.41 X 10 -3^ km/hr
8.37 X 10 -4^ km/hr
1.28 X 10 5 km/hr
5.11 X 10 -2^ km/hr A student finds that 15.20 g of nitrogen will react with 34.74 g of oxygen. Calculate the mass of oxygen per gram of nitrogen in this compound. (34.74 g oxygen)/(15.20 g nitrogen) = 2.29 g oxygen/g nitrogen
(Crx^ ) 2 (CO 3 2-) 3 ; charge balance: 2x + 3(-2) = 0 => x = +3; Cr 3+^ == chromium (III), CO 3 2-^ == carbonate
chromium carbon oxide chromium(III) carbonate chromium carbonate chromium(II) carbonate chromium carboxide Which one of the following names is not correct? iron(III) carbonate - Fe 2 (CO 3 ) 3
Copper(I) oxide - Cu 2 O
zinc nitrate - Zn(NO 3 ) (^2)
sodium hypochlorite - NaClO (^2)
potassium peroxide - K 2 O (^2)
What is the chemical formula of magnesium phosphite?
Mn 3 (PO 4 ) (^2) Mn is manganese, and PO 4 3-^ is phosphate
MnPO 3
Mg 3 (PO 3 ) (^2)
Mg 3 PO 4
Mn(PO 4 ) (^2)
Balance the following chemical equation with the smallest whole number coefficients: a Mg 3 N 2 (s) + b HCl(aq) --> c MgCl 2 (aq) + d NH 4 Cl(aq)
a: 1 b: 8 c: 3 d: 2 a: 2 b: 6 c: 2 d: 3 a: 1 b: 5 c: 4 d: 1 a: 3 b: 6 c: 7 d: 5 a: 2 b: 4 c: 4 d: 6 Write the balanced chemical reaction described by these words: solid potassium chlorate decomposes on heating to form solid potassium chloride and oxygen gas.
Potassium chlorate is (K+^ )(ClO 3 - ) == KClO 3. Potassium chloride is (K+^ )(Cl -^ ) == KCl. Oxygen gas is diatomic O 2.
2KClO 2 (s) --> 2KClO(s) + O 2 (g)
2KClO 4 (s) --> 2KClO(s) + 3O 2 (g)
2KClO(s) --> 2KCl(s) + O 2 (g)
KClO 4 (s) --> KClO 3 (s) + O(g)
2KClO 3 (s) --> 2KCl(s) + 3O 2 (g)
Which one of the following unbalanced chemical reactions is not correctly characterized by reaction type? combustion: C 3 H 6 (g) + O 2 (g) --> CO 2 (g) + H 2 O(l)
decomposition: NH 4 NO 3 (s) --> N 2 O(g) + H 2 O(l)
combustion: C 5 H 6 O(l) + O 2 (g) --> CO 2 (g) + H 2 O(l)
decomposition: K 2 O(s) + H 2 O(l) --> KOH(aq) Combination
combination: N 2 (g) + H 2 (g) --> NH 3 (g)
Calculate the percentage by mass of oxygen in chromium(III) nitrate.
(Cr3+^ )(NO 3 -^ _) 3 == Cr(NO 3 ) 3 FW = (52.00) + 3(14.01 + 316.00) = 238.01 g/mol Oxygen mass = 916.00 = 144.00 g/mol mass ratio: 144.00/238.01 = 0.6050 = 60.50 %_* 72.91 % 60.50 % 47.61 % 36.18 % 83.22 % What is the molar mass of cholesterol if 1.05 mmol (millimole) weighs 406 mg? 406 mg/1.05 mmol = 387 mg/mmol = 0.406 g/0.00105 mol = 387 g/mol 204 g/mol 129 g/mol
LR(NH 3 ): 0.2924-4x = 0 => x = 0. LR(O 2 ): 0.1006-5x = 0 => x = 0. Oxygen is the limiting reagent, ammonia is the reagent in excess. The final reaction table is:
Fn Fm
Im 4.98 3. In 0.2924 0.
Fn 0.2119 0 Fm 3.61 0
1.77 g O 2
2.58 g NH (^3)
3.61 g NH (^3)
3.01 g O 2
0.94 g O 2