Curated OER
2000 U.S. National Chemistry Olympiad National Exam - Part I
The National Chemistry Olympiad exams are comprehensive tests covering an entire year of chemistry concepts. You can use them as practice for competing in the challenge, or simply as a review, or as an actual final exam for your general...
Curated OER
The Mathematics of Chemical Formulas
Wow! This is one of the most exhaustive presentations on finding chemical formulas that you will come across! Beginning with the basics, and leaving junior chemists with procedures and concrete examples, this PowerPoint certainly...
Curated OER
Finding the Percent of Iron in Lawnsand
In this percent of iron in lawnsand worksheet, students perform a titration of lawnsand using potassium manganate (VII) solution and find the number of moles of iron in the sample. Students use the number of moles to find the mass of...
Kenan Fellows
Reaction Stoichiometry—How Can We Make Chalk?
What is a reasonable percent yield in the manufacturing process? Scholars develop a process for producing chalk in the third lesson of a six-part series. Then, they must determine the theoretical and percent yield. Discussions about...
PBS
The Lowdown — Rot and Rubbish: The Rancid Truth about How Much Food We Waste
Compare waste a percent at a time. The resource contains an infographic on food waste. Using images, the informative activity describes the amount and types of food waste that occur. Pupils compare the percentage of waste from their...
Santa Monica College
Mole Ratios and Reaction Stoichiometry
Stoichiometry sounds complicated, but it really means the study of the amount of substances involved in a reaction. The sixth lesson in an 11-part series has scholars use stoichiometry to find the theoretical yield of a reaction. Then,...
Beyond Benign
Product Test
It's the moment of truth. Previous lessons in the 24-part series had scholars design and develop shampoo formulas using chemical concepts. The 18th lesson asks them to test the function of their shampoos. To do this, they calculate the...
Beyond Benign
SLS Toxicology Test
Ingredients in your shampoo are toxic enough to kill plants. The 16th installment of the series of 24 tests the toxicity level of various concentrations of SLS, a chemical found in nearly all shampoo. Learners prepare percent solutions...
Chemistry Collective
Virtual Lab: Cola and Sucrose Concentration Problem
Recreate the secret Coca-Cola formula in a virtual lab. Young scholars create the solution and then calculate sucrose concentrations in terms of percent mass, molarity, molality, and mole fraction. Then using density, learners determine...
Curated OER
Vocabulary - Stoichiometry
In this stoichiometry instructional activity, students write in the definition for the 6 terms associated with stoichiometry including actual yield, percent yield, and limiting reactant.
Curated OER
Find the Percent of Iron in Manganate (VII)
Dilute sulphuric acid is used to oxidize manganate (VII) into manganese (II) and water. Step-by-step procedures are outlined on the learning exercise as well as calculations for junior chemists to perform in their science journals. This...
Curated OER
Our Solar System - Comparing Planetary Travel Distances
NASA presents a mini-unit on distances in our solar system. It incorporates scientific concepts of gravity, mass, density, and payload while your aspiring astronauts also employ mathematics skills. They calculate speed, they determine...
Curated OER
Genome: The Secret of How Life Works
What do you have in common with a fruit fly? About 60 percent of your DNA. The resource, divided into two units, is intended for grades four to eight and another for high schoolers. Both units include eight lessons covering the genome as...
Chemistry Collective
Virtual Lab: Alcohol Density Problem
Assume the role of Canadian border control! The percent of alcohol and density of a solution are related. Young scholars use this fact to classify solutions by their alcohol content to determine if they meet Canadian import laws.
Curated OER
Electrolytes and Colloids Worksheet
In this electrolytes worksheet, learners calculate percent composition, determine the electrical conduction of electrolytes, and explain the Tyndall effect. This worksheet has 7 problems to solve.
Curated OER
Chemical Compounds Worksheet
For this chemical compound worksheet, students calculate the percent composition for given compounds. This worksheet has 5 problems to solve.
Curated OER
Mass % and Empirical Formulas
In this chemistry learning exercise, students calculate percent composition and determine the empirical formulas of compounds to complete 3 problems.
Curated OER
Theoretical Yield and Percent Yield
For this chemical reaction worksheet, students balance equations and then determine the theoretical yield and percent yield for the reaction. This worksheet has 4 problems to solve.
Curated OER
Theoretical Yield and Percent Yield
In this chemical equations worksheet, students balance chemical equations and then calculate the theoretical yield and percent yield for the reaction. This worksheet has 4 problems to solve.
Curated OER
Stoichiometry, Percent Yield and Limiting Reagents: practice problems
The questions here present situational problems and calculations to help your students understand the application of the math and data analysis practice.
Curated OER
Concentration Practice
In this concentration worksheet, high schoolers find the percent volume of a compound in a solution and the molality of a solution. They determine the percent mass of a compound in a solution and they determine the mole fraction of water...
Curated OER
Ellipses
In this ellipses activity, students calculate the eccentricity of 5 given ellipses and show their calculations. Students then determine the percent deviation for their calculations using the accepted values of eccentricity.
Curated OER
Worksheet 2-2 Stoichiometric Tools
In this stoichiometry worksheet, learners solve a variety of problems including finding empirical and molecular formulas, determining molarities of solutions, determining molecular weights of compounds and calculating the percent mass of...
Curated OER
Hand Lotion Analysis
Students prepare a sample of a commercial hand lotion for analysis by HPLC to determine the percent composition of two common cosmetic preservatives, methylparaben and propylparaben. They perform the analysis and the data is evaluated to...
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