Basics
The process of making sure there are the same number of atoms on both sides of a chemical equation.
What is balancing?
The mole ratio of N₂ to NH₃ in N₂ + 3H₂ → 2NH₃.
What is 1:2?
The first step in a mass-to-mass stoichiometry problem.
What is convert grams to moles?
The reactant that runs out first in a chemical reaction.
What is the limiting reactant?
The formula for percent yield.
What is (actual yield / theoretical yield) × 100?
These numbers in a chemical equation represent mole ratios.
What are coefficients?
Mole ratio of O₂ to CO₂ in C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.
What is 5:3?
How many grams of H₂O are produced from 2 moles of H₂ and excess O₂?
What is 36 g?
The amount of product formed is determined by this reactant.
What is the limiting reactant?
If the theoretical yield is 40 g and the actual is 36 g, the percent yield is...
What is 90%?
In the equation 2H₂ + O₂ → 2H₂O, how many moles of water are formed from 1 mole of oxygen?
What is 2 moles?
In 2KClO₃ → 2KCl + 3O₂, how many moles of O₂ from 10 moles of KClO₃?
What is 15 moles?
Calculate the mass of 4 moles of CO₂.
What is 176 g?
If 5 moles of A react with 8 moles of B in a 1A:2B ratio, the limiting reactant is...
What is B?
If 10 g of product was expected but only 6 g was made, calculate the percent yield.
What is 60%?
The type of reaction where two substances form one product.
What is a synthesis reaction?
If 2.5 moles of A react with B in a 1:3 ratio, how many moles of B are needed?
What is 7.5 moles?
How many grams of NaCl are formed from 2.5 moles of Na (Na + Cl → NaCl)?
What is 146.25 g?
What do you compare to determine the limiting reactant?
What is the number of moles required vs. available for each reactant?
The amount of product you should get from a reaction.
What is the theoretical yield?
If 4 moles of HCl react with excess NaOH, how many moles of NaCl are produced?
What is 4 moles?
This law underlies the concept of mole ratios in chemical reactions.
What is the Law of Conservation of Mass?
50 g of Ca reacts with water: how many grams of H₂ are produced? (Ca + 2H₂O → Ca(OH)₂ + H₂)
What is 1.4 g?
Given: 10 g of H₂ and 80 g of O₂. What’s the limiting reactant in forming H₂O?
What is H₂?
A chemist calculates a percent yield over 100%. What likely happened?
What is a measurement error in the product?