1. chemistry

2. 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

3. 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.

6. 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.

11. for Conceptual Problem 11.2
Problem Solving 11.6 Solve Problem 6 with the help of an interactive guided tutorial.

12. 11.1 Section Quiz.
11.1.

13. 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

14. 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

15. 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

16. END OF SHOW