Limiting Reactants Gizmos Answer Key

24 July 2022
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question
The limiting reactant in a chemical reaction is the reactant that A. is used up at the end of the reaction. B. is left over after the reaction. C. has the largest number of atoms. D. has the fewest number of atoms.
answer
Correct Answer: A. is used up at the end of the reaction.
question
How many water molecules (H2O) can be produced from 6 molecules of hydrogen gas (white) reacting with 6 molecules of oxygen gas (red)? Which reactant is the limiting reactant? A. 6 water molecules, hydrogen is limiting B. 3 water molecules, oxygen is limiting C. 3 water molecules, hydrogen is limiting D. 12 water molecules, oxygen is limiting
answer
Correct Answer: A. 6 water molecules, hydrogen is limiting
question
34 atoms of carbon (C) react with 22 molecules of hydrogen gas (H2). How many molecules of methane (CH4) will be formed, and what will be left over? A. 17 molecules of methane formed, 5 molecules of hydrogen left over B. 11 molecules of methane formed, 23 molecules of carbon left over C. 5 molecules of methane formed, 24 atoms of carbon and 2 molecules of hydrogen left over D. 22 molecules of methane formed, 12 atoms of carbon left over
answer
Correct Answer: B. 11 molecules of methane formed, 23 molecules of carbon left over
question
When aluminum (Al) reacts with chlorine gas (Cl2), aluminum chloride (AlCl3) is produced according to the balanced equation below:2Al + 3Cl2 β†’ 2AlCl3If 20 atoms of aluminum react with 45 molecules of chlorine gas, which reactant is limiting and how many more atoms/molecules would be required to use up all the reactants? A. Chlorine is limiting, 5 more molecules are needed. B. Chlorine is limiting, 15 more molecules are needed. C. Aluminum is limiting, 10 more atoms are needed. D. Aluminum is limiting, 25 more atoms are needed.
answer
Correct Answer: C. Aluminum is limiting, 10 more atoms are needed.
question
According to the following balanced equation, 2 formula units of iron (III) oxide (Fe2O3) can be formed by reacting 4 atoms of iron (Fe) with 3 molecules of oxygen gas (O2). If 12 atoms of iron are reacted with 6 molecules of oxygen gas, which is the limiting reactant and how many atoms or molecules will be left over?4Fe + 3O2 β†’ 2Fe2O3 A. Iron, 1 molecule of O2 remains B. Iron, 2 molecules of O2 remain C. Oxygen, 6 atoms of Fe remain D. Oxygen, 4 atoms of Fe remain
answer
Correct Answer: D. Oxygen, 4 atoms of Fe remain