5.2 Writing and Balancing Chemical Equations

PRACTICE EXERCISE

Answer the questions below for the following chemical equations:
1. C3H8 (g)+5 O2 (g)→3 CO2 (g)+4 H2O (g) $cap c sub three times cap h sub eight times of g plus five times cap o sub two times of g right arrow three times CO sub two times of g plus four times cap h sub two cap o of g$
2. C4H6 (g)+2 H2 (g)→C4H10 (g) $cap c sub four times cap h sub six times of g plus two times cap h sub two times of g right arrow cap c sub four times cap h sub 10 times of g$
  1. Indicate the physical state (s, l, or g) of each reactant and product.

For example, when nitrogen (N2) $left parenthesis cap n sub two right parenthesis$ and oxygen (O2) $left parenthesis cap o sub two right parenthesis$ are combined with heating, nitrogen monoxide (NO) $left parenthesis NO right parenthesis$ is produced, as illustrated in Figure 5-6. In this chemical reaction, the bond between the nitrogen atoms breaks and the bond between the oxygen atoms breaks, and new bonds are formed between nitrogen and oxygen atoms, creating nitrogen monoxide (NO) $left parenthesis NO right parenthesis$ molecules.