In a common experiment in the general chemistry laboratory, magnesium metal. The mole in chemical reactions introductory chemistry 1st. Determine the mole ratios from a balanced chemical equation. On the second day they conduct the lab, and on the third day they write and critique their lab report. In chapter 4 chemical reactions and equations, section 4. In this article, we will discuss how to use mole ratios to calculate the amount of reactants needed for a reaction. The ratios of the coefficients of the balanced reaction represent the ratios of particles or. Lots and lots and lots of practice problems with mole ratios. How would the following modifications of the experimental procedure used in this experiment affect the mass of the precipitate collected.
This video is part of the flinn scientific best practices for. The objectives of this laboratory are to experimentally determine the mole to mole ratios between the underlined reactants and products in the following two double displacement gas forming reactions. Oct 16, 2019 mole ratios stoichiometry problems can be characterized by two things. Write balanced equations for the two reactions you will perform in this lab. Chemical arithmetic stoichiometry is the study of the numerical relationships in chemical formulas and reactions. State how many mole ratios can be written for a chemical reaction involving three substances. Stoichiometric coefficients in a balanced equation indicate molar ratios in that reaction. Mole ratios, chemical reactions, stoichiometry, law of conservation of mass, mole calculations outcomes. Eleventh grade lesson stoichiometry experimental design.
We assume that reactions are stoichiometric react in whole number ratios quantitative all reactants are used up spontaneous fast lesson 1. The ratio used to compare the number of moles of two substances in a chemical reaction. As such, chemical equations also give us equivalences. The mole ratio may be determined by examining the coefficients in front of formulas in a balanced chemical equation. You can use the relationships between coefficients to derive conversion factors called mole ratios.
Mole ratios are used as conversion factors between products and reactants in many chemistry problems. Stoichiometry expresses the quantitative relationship between reactants and products in a chemical equation. Decomposition of baking soda inquiry lab and stoichiometry calculations to determine the balanced chemical equation for decomposition of baking soda. Mole ratios and reaction stoichiometry objectives and background. In this experiment, baking soda nahco3 reacts with hydrochloric acid hcl to. Grams to moles virtual lab this video presents a virtual lab based on the chemical reaction of acetic acid and sodium bicarbonate. Use your masses of sodium bicarbonatecarbonate reactants weighed out in lab as the starting point and the mole ratios from the balanced equations for these calculations. Calculate your percent yield of sodium chloride product. Although the balanced equation does not tell us anything about the mechanism of the reaction how the atoms come together and how bonds are formed or broken, it does give us information on the stoichiometry of the reaction.
Mass conservation in chemical reactions pages 357358 10. In chemistry, quantities of reactants and products of a chemical reaction are calculated in moles. I begin by interpreting one of the balanced chemical equations from the do now. Use the balanced equation to construct conversion factors in terms of moles. Lab investigation 5 what is the optimum mole ratio for a reaction. Stoichiometry allows us to predict certain values, such as the percent yield of a product or the molar mass of a gas. I note that mole ratios are a ratio comparison between substances in a balanced equation, and i explain how to use mole ratios to determine how many moles of product you can make or how many mole of reactant you need to make a certain amount of product. Indicate whether the mass would be greater than unchanged, or less. Use mole ratios for the balanced chemical equation to calculate the quantity of one substance in a reaction given the quantity of another substance in the reaction given moles, particles, mass, or volume and ending with moles, particles, mass, or volume determine when to use mole conversion vs. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Access free flinn chemtopic labs chemical reactions answer key. Product features videos micro rocket lab students compete to find the most efficient hydrogenoxygen mole ratio. Indicate whether the mass would be greater than unchanged, or less than that obtained.
Target mole lab video pdf target stoichiometry lab video pdf synthesis of manganeseii chloride video pdf limiting and excess reactants micro rocket lab video pdf bottles and caps an analogy to stoichiometry video pdf fuel cell football video pdf stoichiometry in combustion reactions carbide cannon video pdf stoichiometry in combustion of. An investigation of mole ratios and limiting reactants guiding question what is the optimum mole ratio for the formation of co 2 from the reaction of sodium bicarbonate and acetic acid. Using masstomass stoichiometry, calculate the theoretical yield of nacl for reaction a. Calculate stoichiometric quantities from balanced chemical equations using units of moles, mass, representative particles, and volumes of gases at stp. Kinetics of a reaction lab video about the mole ratios copper and silver nitrate lab kit stoichiometrywhat a strange and scary word. I then explain that we are going to learn how to use mole ratios. Stoichiometry chemical reactions and stoichiometry. When some of the chemical formulas are not known, an experiment must be conducted to help determine the mole ratios. In this lesson students learn how to design an experiment in which they can evaluate how closely an experiment. In doing the launch lab, were you surprised when the purple color of. Stoichiometry is the study of chemical quantities consumed or produced in a chemical reaction.
Pdf stem activities in determining stoichiometric mole. Unit 6d mole ratio lab investigation georgia public broadcasting. Moletomole ratios and calculations of a chemical equation. Mole ratio of an unknown warning this kit contains chemicals that teachers manual may be harmful if misused. In a balanced chemical equation symbols and formulas represent all reactants and. Stoichiometry is simply just a chemists mathematical way of following a recipe, or a balanced equation.
Did you know that everything is made out of chemicals. At the microscale, this reaction is mixing 2 molecules of water with 1 molecule of oxygen to produce 2 molecules of hydrogen peroxide. Stoichiometry problems can be characterized by two things. Learners use the coefficients in a balanced equation to develop the mole ratios of reactants and products involved in the reaction. Your goal in this lab is to experimentally verify the moletomole ratios between a certain reactant and. This chemistry video tutorial provides a basic introduction into stoichiometry. Mole ratios are the first part of any stoichiometric problem. In actuality, one rarely uses full moles when working in the lab. Jan, 2019 a mole ratio is the ratio between the amounts in moles of any two compounds involved in a chemical reaction. Write a balanced equation for the reaction that took place in the experiment. We represent reactions in a shorthand notation called a balanced chemical equation. Knowing the mole ratios in a balanced chemical equation is essential to solving stoichiometry problems. Using a balanced chemical equation to calculate amounts of reactants and products is called stoichiometry.
Use your initial mass of sodium bicarbonate reactant as a starting point, along with the relevant mole ratio from the balanced equation to perform this calculation. Mole to mole ratios and calculations of a chemical. Mole ratios in chemical equations by debbie mcclinton dr. It contains mole to mole conversions, grams to grams and mole to gram dimensional. Target mole lab video pdf target stoichiometry lab video pdf synthesis of manganeseii chloride video pdf limiting and excess reactants micro rocket lab video pdf bottles and caps an analogy to stoichiometry video pdf fuel cell football video pdf stoichiometry in combustion reactions carbide cannon video pdf. Stoichiometry basic introduction, mole to mole, grams to grams, mole ratio practice problems this chemistry. Determining the stoichiometry of chemical reactions. Stoichiometry is the study of quantitative relationships. Allow students to choose either models, illustrations, or verbal explanations as a. The balanced equation gives you the ratios of moles that each reactant and product are present in the reaction.
The given and the unknown may both be reactants, both be products, or one may be a reactant while the other is a product. Mole ratios you have read that the coefficients in a chemical equa. Use mole ratios to calculate moles of desired chemical. In the first day students design their lab, which includes solving a stoichiometry problem.
Lab investigation 5 what is the optimum mole ratio for a. This is the first step in learning stoichiometry, for using a chemical equation to get. The numbers that fit into this ratio are pulled directly out of the. Concepts stoichiometry balanced chemical equation mole ratio limiting reactant percent yield single replacement reaction. Stoichiometry basic introduction, mole to mole, grams to grams, mole ratio practice problems this chemistry video tutorial provides a basic introduction into stoichiometry. Mole ratios stoichiometry problems can be characterized by two things. Stem activities in determining stoichiometric mole ratios for secondaryschool chemistry teaching article pdf available in journal of chemical education 966 april 2019 with 474 reads.
Chemical reactions form the core of the study of chemistry. Students solve simple problems by inspection and by setting up a simple ratio. Were you surprised when, in doing the discovery lab, you saw the purple color of potassium permanganate disappear as you added sodium hydrogen sulfite. Calculate moles of one substance from moles of another substance using a balanced chemical equation. Students will take notes using the mole ratio notes organizer. Moles and mole ratios learning objectives to understand the concept of mole and calculate percent yield to understand the role mole ratios play in a chemical reaction a mole is a unit that specifies a quantity of 6.
Decomposition of baking soda inquiry lab and stoichiometry calculations to determine the. Stoichiometry is the study of the quantitative relationships in substances and their reactions. Stoichiometry relates molar ratios between reactants and products in a chemical equation. Use your masses of sodium bicarbonatecarbonate reactants weighed out in lab as the starting point and the mole ratios from. The mole ratio is important because it allows chemists to determine how many moles of a product will be produced from a specific number of moles of a reactant or. Theoretical yield what the balanced equation tells should be. Please read individual bottle warnings to ensure that all items are handled safely and appropriately. Download file pdf 11 chemical reactions answer key pearson hall grams, mole ratio practice problems this chemistry video tutorial provides a basic introduction into stoichiometry. The reaction of hydrochloric acid hcl with sodium bicarbonate and sodium carbonate produces the same. Stoichiometry basic introduction, mole to mole, grams to. Reaction stoichiometry is based on the balanced chemical equation for any given reaction.
Chemical reactions are characterized by the rearrangement. You will use stoichiometry of your lab data to determine the moles of. One mole of elemental nitrogen reacts with three moles of elemental hydrogen to produce two moles of ammonia. Your goal in this lab is to experimentally verify the mole to mole ratios between a certain reactant and a certain product in both reactions. Percent yields calculate the theoretical yield of nacl for both reactions a and b via standard masstomass stoichiometry.
The mole in chemical reactions introductory chemistry. Moles lab activities strand molar relationships topic investigating stoichiometry primary sol ch. Mole ratios are used as conversion factors between products and reactants in stoichiometry calculations. Construct mole ratios from balanced chemical equations and apply these ratios in stoichiometric calculations.
This would be considered a theoretical approach to the problem. The mole in chemical reactions learning objectives. This editable powerpoint and notes package introduces students to the basic concept of stoichiometry ratios in chemical reactions and looks specifically at mole ratios. The ratios of these coefficients represent the mole ratios that govern the disappearance of reactants and appearance of products. It is a super technicalsounding word that simply means using ratios from the balanced equation. In reaction a, the balancing coefficients indicate that there is a 1.
This lab will illustrate the actual mole and mass relationship among reactants and. Clean the glassware and dispose of the leftover chemicals as directed by your teacher. The amounts you use can be converted into moles and then the mole ratios from the balanced equation can be used. The easiest way to obtain the mole to mole ratios would be to simply balance the chemical equations for these reactions. Grams a x 1 mole a x y mole b x g b gram b g a x mole a 1 mole b.
Categorize the ways in which a balanced chemical equation can be interpreted. Mole ratios are derived from the coefficients of a balanced chemical equation. One mole of methane molecules and 2 moles of oxygen molecules react to yield 1. Students come to understand that the products of a chemical reaction can be related to the reactants by virtue of mole ratios, because chemical reactions must adhere to the law of conservation of mass.