Practice: For each of the real chemical formulas below, calculate how many of each element.Try typing in other subscripts next to the (OH), such as 3, 4, and 5. In general, what happens when a subscript is found outside of parentheses?Ĭ. How many of each type of atom do you see? Ca: _ O: _ H: _ī. Count: Clear the Reactants box, and type in a more complex chemical formula: “Ca(OH)2.”Ī.Try typing in other subscripts next to the H, such as 3, 4, and 5. In general, what do you think a subscript in a chemical formula tells you? _Ĭ. Note that theįormula is shown as H 2 below. Observe: Type “H2” into the Reactants box and hit Enter on your keyboard. Question: How do we read chemical formulas? In this activity, you will practiceĬounting the atoms that are represented in chemical formulas. Introduction: To balance a chemical equation, you first need to be able to count how manyĪtoms of each element are on each side of the equation. Check that the Visual displays are selected. Erase the chemical formulas in each text box. Based on what you see, is this equation currently balanced? _.How many oxygen atoms are on the Reactants side? _ Products side? _ How many hydrogen atoms are on the Reactants side? _ Products side? _ī. Check that the Visual display is chosen on each side of the Gizmo, and count the atoms.Ī.This represents the reaction of hydrogen and oxygen gas to form water. First, type in “H2+O2” in the Reactants box and “H2O” in the To set up an equation in the Chemical Equations Gizmo, type the chemical formulas into the Therefore, a balanced chemicalĮquation will show the same number of each type of atom on each side of the equation. No atoms are created or destroyed in a chemical reaction. The law of conservation of matter states that In this situation, what would happen if you lit up the candle and waited? _īurning is an example of a chemical reaction. The candle and jar are balanced by an equal weight. Suppose the candle was placed in a large, sealed jar that allowed it to burn for several. What would happen if you lit up the candle and waited for a while? _
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