chemistry

Writing Chemical Equations 11.1 Writing Chemical Equations A skeleton equation is a chemical equation that does not indicate relative amounts of reactants and products. Skeleton equation for rusting: Fe + O2  Fe2O3

Writing Chemical Equations 11.1 Writing Chemical Equations A catalyst is a substance that speeds up the reaction but is not used up in the reaction. Hydrogen peroxide decomposes to form water and oxygen gas. a) Bubbles of oxygen appear slowly as decomposition proceeds. b) With the addition of the catalyst manganese(IV) oxide (MnO2), decomposition speeds up. The white “smoke” is condensed water vapor.

Balancing Chemical Equations 11.1 Balancing Chemical Equations To write a balanced chemical equation: write the skeleton equation use coefficients to balance so that it obeys the law of conservation of mass.

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

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