Tin oxide is heated with hydrogen gas to form tin metal and water vapor. Write the state of the matter immediately following the formula of the substance it describes.
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Use (aq) for species in solution in water. Indicate the states of matter of the reactants and products. Do not add subscripts, because this will change the formulas. Once one element is balanced, proceed to balance another, and another until all elements are balanced.īalance chemical formulas by placing coefficients in front of them. Tip: Start by balancing an element that appears in only one reactant and product. Reactions at equilibrium will have arrows facing both directions.Īpply the Law of Conservation of Mass to get the same number of atoms of every element on each side of the equation. Reactants and products are separated by putting an arrow between them to show the direction of the reaction.
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Products are listed on the righthand side of the equation. There are essentially three steps to the process:Ĭhemical formulas of reactants are listed on the lefthand side of the equation. It takes practice to be able to write balanced equations. The quantities are expressed as grams or moles. The equation identifies the reactants (starting materials) and products (resulting substance), the formulas of the participants, the phases of the participants (solid, liquid, gas), and the amount of each substance.īalancing a chemical equation refers to establishing the mathematical relationship between the quantity of reactants and products.
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In Greek, stoikhein means element and metron means measures, so stoichiometry literally translated means the measure of elements.Ī chemical equation describes what happens in a chemical reaction. Balancing of chemical equation practice: Stoichiometry is a section of chemistry that involves using relationships between reactants and/or products in a chemical reaction to determine desired quantitative data.