PNCO 2023 School-Level Eliminations
Quiz
•
Chemistry
•
9th - 12th Grade
•
Hard
Genalyn Alice Viloria
Used 2+ times
FREE Resource
50 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In mammals, lactose (milk sugar) is metabolized to glucose (C6HI206), the key nutrient for generating chemical potential energy. How many grams of carbon are in 16.55 g of glucose?
6.62 g
9.93 g
4.14 g
12.41 g
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Elemental analysis of a sample of an ionic compound showed 2.82 g of Na, 4.35 g of Ct, and 7.83 g of 0. What is the empirical formula and name of the compound? Atomic Masses: Na: 22.99 g/mol, Cl: 35.45 g/mol, O: 16.00 g/mol
NaClO
Na2ClO2
NaClO2
NaClO4
Na2ClO4
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Within the cylinders of a car's engine, the hydrocarbon octane (C8H18), one of many components of gasoline, mixes with oxygen from the air and burns to form carbon dioxide and water vapor. What are the coefficients (arranged in order of appearance) in the balanced equation for the complete combustion of octane?
_ C8H18 + _ O2 → _ CO2 + _H2O
1, 12, 8, 9
1, 24, 8, 9
2, 25, 16, 18
2, 12, 8, 9
2, 24, 16, 18
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Copper is obtained from sulfide ores, such as chalcocite, or Copper(I) Sulfide, by a multistep process. After an initial grinding, the first step is to "roast" the ore (heat it strongly with oxygen gas) to form powdered Copper(I) oxide and gaseous sulfur dioxide. How many grams of sulfur dioxide are formed when 10.0 mol of copper(I) sulfide is roasted? The molar mass of SO2 is 64.04 g/mol.
320.4 g
640.7 g
1281 g
12.81 g
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A fuel mixture used in the early days of rocketry is composed of two liquids, hydrazine (N2H4) and dinitrogen tetraoxide (N2O4), which ignite on contact to form nitrogen gas (N2) and water vapor (H2O). How many grams of nitrogen gas form when 100 g of N2H4 and 2.00 x 200 g of N2O4 are mixed?
65.6 g
182 g
131 g
91.6 g
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many hydrogen atoms are in 2.50 g of pharmacolite, CaHAsO4•2H2O (Molar Mass = 216.0)?
6.97 × 1021
2.09 × 1022
2.79 × 1022
3.48 × 1022
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A 2.50 L sample of butane gas (C4H10), measured at 22.0 ºC and 1.20 atm pressure, is combusted completely and the carbon dioxide gas collected at the same pressure and temperature. What volume of CO2 is produced?
2.50 L
9.00 L
10.0 L
22.5 L
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