# REVISED Copy of Gizmo Chemical Equations.docx - Name...

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Name: Mikaela CruzaDate: 6/23/2020Student Exploration: Chemical Equations RevisedVocabulary:Avogadro’s number, chemical equation, chemical formula, chemical reaction, coefficient, combination, combustion, conservation of matter, decomposition, double replacement, molar mass, mole, molecular mass, molecule, product, reactant, single replacement, subscriptPrior Knowledge Questions (Do these BEFORE using the Gizmo.)1. A candle is placed on one pan of a balance, and an equal weight is placed on the other pan.What would happen if you lit up the candle and waited for a while?
2. Suppose the candle was placed in a large, sealed jar that allowed it to burn for several minutes before running out of oxygen. The candle and jar are balanced by an equal weight.In this situation, what would happen if you lit up the candle and waited?
Gizmo Warm-upBurning is an example of a chemical reaction. The law of conservation of matterstates that no atoms are created or destroyed in a chemical reaction. Therefore, a balanced chemical equationwill show the same number of each type of atom on each side of the equation.To set up an equation in the Chemical EquationsGizmo™, type the chemical formulasinto thetext boxes of the Gizmo. First, type in “H2+O2” in the Reactantsbox and “H2O” in the Productsbox. This represents the reaction of hydrogen and oxygen gas to form water.1. Check that the Visual display is chosen on each side of the Gizmo, and count the atoms.A. How many hydrogen atoms are on the Reactantsside? 2Productsside? 2B. How many oxygen atoms are on the Reactantsside? 2Productsside? 1
2. Based on what you see, is this equation currently balanced? No.Activity A:Interpreting chemical formulasGet the Gizmo ready:· Erase the chemical formulas in each text box.· Check that the Visualdisplays are selected.Introduction: To balance a chemical equation, you first need to be able to count how many atoms of each element are on each side of the equation. In this activity, you will practice counting the atoms that are represented in chemical formulas.Question: How do we read chemical formulas?1. Observe: Type “H2” into the Reactantsbox and hit Enteron your keyboard. Note that the formula is shown as H2below. The small “2” in H2is a subscriptA. What does the “2” in H2.