Units Matter!
This is the number of particles contained in one mole of a substance
What is 6.02 x 1023 particles?
This ingredient becomes the limiting reactant when making a milkshake that calls for 1 banana, 1 cup of milk, 5 strawberries, and 4 ice cubes, given that you have 3 bananas, 4 cups of milk, 18 strawberries, and 13 ice cubes
What are the bananas?
This allows you to convert between quantities of reactants and products in a balanced chemical reaction
What is the mole ratio?
These are the types of experimental mistakes or conditions that can cause the actual yield of a reaction to be lower than the theoretical yield.
What are impurities and competing side reactions?
This is the molecular formula of a compound whose empirical formula is NO₂ and whose molar mass is 92 g/mol.
What is N2O4?
This is the molar mass, in grams per mole, of the compound potassium permanganate
Given the reaction 2Na + Br₂ → 2NaBr, this substance is the limiting reactant when 1.8 moles of sodium react with 1.4 moles of bromine
What is sodium?
In the combustion of methane, this is the mole ratio of methane to water.
What is 1:2?
This is the percent composition of oxygen by mass in the compound calcium hydroxide
True or False: Increasing the amount of the excess reactant in a chemical reaction will always result in a greater amount of product formed
What is false?
A 4.85 g sample contains 0.20 moles of an unknown element, the element is _______.
What is magesium?
When 20 molecules of CO react with 30 molecules of O₂ in a flask to form CO₂, this is the amount, in molecules, of the excess reactant that remains after the reaction is complete
What is 20 molecules of O2?
For the reaction 2 N₂O₅ → O₂ + 4 NO₂, ______ moles of dinitrogen pentoxide are needed to produce 1.60 moles of nitrogen dioxide, and it will produce _____ moles of oxygen.
What is 0.80 mol of N₂O₅ and 0.40 mol of O₂?
This is the mass, in grams, of each component—tin (10%), antimony (16%), and lead (74%)—found in a 500-gram sample of a certain metal alloy.
This law states that a chemical compound always contains the same elements in exactly the same proportion by mass, no matter the sample size or source
This is the total number of atoms present in 0.68 moles of silicon.
What is 4.09 x 1023?
According to the reaction CaO + H2O → Ca(OH)2 this is the maximum amount of calcium hydroxide which will be produced from 4.44g of calcium oxide and 7.77g of water
What is 5.87g?
When sodium fluoride decomposes into sodium and fluorine, a sample produces 28.8 grams of sodium. This is the mass of fluorine, in grams, that must also have been produced
What is 23.8g?
In a small-scale industrial test, 500 grams of carbon disulfide were produced at an 86% yield according to the reaction 3C + 2SO₂ → CS₂ + 2CO₂. This is the theoretical yield, in grams
What is 581g?
This is the molecular formula of a compound with molar mass 208.5 g/mol and percent composition 14.9% phosphorus and 85.1% chlorine
What is PCl5?
This is the total number of atoms present in a 4.67 gram sample of potassium chlorate.
What is 1.15 x 1023 atoms?
In the reaction 3Fe + 4H₂O → Fe₃O₄ + 4H₂, 84 grams of iron react with 50 grams of water. This is the limiting reactant, and this is the mass of Fe₃O₄ produced
What is Fe and 116g?
A 20-gram mixture of potassium nitrate and potassium chloride is treated with silver nitrate, producing 8.66 grams of AgCl. These are the percent-by-mass compositions of KNO₃ and KCl in the original mixture. AgNO3 + KCl → AgCl + KNO3
What are 77.5% KNO₃ and 22.5% KCl?
This element, known only as X, forms the oxide X₂O. If X₂O is found to be 25.8% oxygen by mass, this is the identity of element X
What is sodium?
This is the mole ratio of O2:SiO2 in Si4H10 + O2 → SiO2 + H2O
What is 13:8?