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10.1 Describing Chemical Reactions • On May 6, 1937, the huge airship Hindenburg erupted into a fireball. Within a short time, 210,000 cubic meters of hydrogen had burned and the airship was destroyed. The chemical reaction that occurred is “hydrogen combines with oxygen to produce water.” You will learn to represent this chemical reaction by a chemical equation.
11.1 Writing Chemical Equations • Writing Chemical Equations • How do you write a word equation?
11.1 Writing Chemical Equations • Word Equations • Reactant + Reactant Product + Product
11.1 Writing Chemical Equations • Methane + Oxygen Carbon dioxide + Water
11.1 Writing Chemical Equations • iron + oxygen iron(III) oxide
11.1 Writing Chemical Equations • Hydrogen Peroxide Water and Oxygen
11.1 Writing Chemical Equations • Chemical Equations • A chemical equation is a representation of a chemical reaction.
11.1 Writing Chemical Equations • How do you write a skeleton equation?
11.1 Writing Chemical Equations • Write the formulas of the reactants to the left of the yields sign (arrow) and the formulas of the products to the right.
11.1 Writing Chemical Equations • A skeleton equation is a chemical equation that does not indicate the relative amounts of the reactants and products. • Here is the equation for rusting: • Fe + O2 Fe2O3
11.1 Writing Chemical Equations • A catalyst is a substance that speeds up the reaction but is not used up in the reaction. • Without Catalyst With Catalyst
11.1 Writing Chemical Equations
Writing Chemical Equations • Animation 12 • Relate chemical symbols and formulas to the information they communicate.
for Conceptual Problem 11.1 Problem Solving 11.2 Solve Problem 2 with the help of an interactive guided tutorial.
11.1 Balancing Chemical Equations • Balancing Chemical Equations • What are the steps in writing a balanced chemical equation?
11.1 Balancing Chemical Equations • To write a balanced chemical equation, first write the skeleton equation. Then use coefficients to balance the equation so that it obeys the law of conservation of mass.
11.1 Balancing Chemical Equations • This is a balanced equation for making a bicycle. The numbers are called coefficients—small whole numbers that are placed in front of the formulas in an equation in order to balance it.
11.1 Balancing Chemical Equations • A chemical reaction is also described by a balanced equation in which each side of the equation has the same number of atoms of each element and mass is conserved.
Balancing Chemical Equations • Simulation 11 • Sharpen your skills by balancing chemical equations.
for Conceptual Problem 11.2 Problem Solving 11.4 Solve Problem 4 with the help of an interactive guided tutorial.
for Conceptual Problem 11.2 Problem Solving 11.6 Solve Problem 6 with the help of an interactive guided tutorial.
11.1 Section Quiz. • 11.1.
11.1 Section Quiz. • 1. Propane gas reacts with oxygen to produce water vapor and carbon dioxide. Choose the correct word equation for this reaction. • propane + carbon dioxide water + oxygen • propane + oxygen + water carbon dioxide • propane + oxygen + water + carbon dioxide • propane + oxygen water + carbon dioxide
11.1 Section Quiz. • 2. Which of the following is a skeleton equation? • H2 + CO CH3OH • 2H2 + CO CH3OH • 2H2 + CO2 CH3OH • hydrogen + carbon monoxide methanol
11.1 Section Quiz. • 3. What coefficient for H2SO4 is required to balance the following equation? • Ca3(PO4)2 + ____ H2SO4 3CaSO4 + 2H3PO4 • 1 • 2 • 3 • 4
