Stoich Practice
Flashcard
•
Chemistry
•
10th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is stoichiometry?
Back
Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the conservation of mass.
2.
FLASHCARD QUESTION
Front
What is the mole ratio in a chemical reaction?
Back
The mole ratio is the ratio of the coefficients of the reactants and products in a balanced chemical equation, used to convert between moles of different substances.
3.
FLASHCARD QUESTION
Front
How do you calculate the mass of a reactant needed in a reaction?
Back
To calculate the mass of a reactant needed, use the balanced equation to find the mole ratio, convert the mass of the known substance to moles, and then use the mole ratio to find the moles of the unknown substance. Finally, convert moles back to mass.
4.
FLASHCARD QUESTION
Front
What is the balanced equation for the combustion of diborane (B2H6)?
Back
B2H6 + 3O2 → 2HBO2 + 2H2O.
5.
FLASHCARD QUESTION
Front
How many moles of water are produced from 4 moles of ammonia (NH3)?
Back
18 moles of water are produced from 12 moles of NH3 based on the reaction 4NH3 + 5O2 → 4NO + 6H2O.
6.
FLASHCARD QUESTION
Front
What is the significance of balancing a chemical equation?
Back
Balancing a chemical equation ensures that the law of conservation of mass is obeyed, meaning the number of atoms of each element is the same on both sides of the equation.
7.
FLASHCARD QUESTION
Front
What is the formula to convert grams to moles?
Back
Moles = mass (g) / molar mass (g/mol).
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