The study sought to find out difficulties encountered by high school chemistry students when solving stoichiometric problems and how these could be overcome by using a problem-solving approach. 485 participants drawn from 8 highs schools in a local education district in Zimbabwe participated in the study.
A validated stoichiometry achievement test was used to collect data at pre-test and post-test stages.
In other words, stoichiometry is the practice of using a chemical reaction equation to predict the results of the reaction. Of course, that means that we need to start with a chemical reaction.
When we look at the two sides of the reaction, we have to make sure that the number of atoms of each element on each side is the same because of the principle of conservation of mass. In this section of the AP Chemistry Crash Course, we’ll start by looking at the basic concepts of stoichiometry, and then we’ll cover five applications for stoichiometry on the AP Chemistry exam.
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Fw-300 .qstn-title #ya-trending-questions-show-more, #ya-related-questions-show-more #ya-trending-questions-more, #ya-related-questions-more /* DMROS */ .For glucose, the molecular weight is 180.158 grams per mole.We can now use this to convert from grams of glucose to moles of glucose by multiplying by one mole of glucose per 180.158 grams of glucose.This balanced equation tells us a lot about how this reaction works. This one is another very important application of stoichiometry for the AP Chemistry exam.The core concept we can take away from it is that one molecule of methane combines with two molecules of diatomic oxygen to form one molecule of carbon dioxide and two molecules of water, or correspondingly, that one mole of methane combines with two moles of diatomic oxygen to form one mole of carbon dioxide and two moles of water. A note about nomenclature: saying reagent makes me feel like a mysterious alchemist, but I’m going to favor reactant because I think it’s a little bit clearer. Stoichiometry allows us to work in solution by giving us the concept of solution concentration, or molarity.Molarity is a unit that is often abbreviated as capital M.It is defined as the moles of a substance contained in one liter of solution.For instance, if a solution has a concentration of 1.20 M Na Cl, this means that there are 1.20 moles of Na Cl per liter of solution.First, let’s talk about the basic concepts of stoichiometry.First of all, we have to start with a balanced reaction. I add up the number of atoms of each element on the left side: one carbon, four hydrogens, and two oxygens. First, we look at the left side and see that we need four hydrogens.