Law of Conservation and Mass

Question 1

1

Answer 1

In a chemical reaction, the total mass of the products is always the same as the total mass of the reactants.

1. Word Equation
   - Hydrogen +Oxygen -> water
   -> the series means yields reacts to produce
2. Skeleton Equation
   - H2+O2->H2O
3. Balanced Chemical Equation
   - 2H2(g)+O2(g)->2H2O(g)

Question 2

Ammonia NH3(g) is produced from a reaction of nitrogen gas and hydrogen gas. Write a balanced equation for this chemical reaction

Answer 2

Word Equation
- Nitrogen + hydrogen —> ammonia

Skeletal Equation
- N2 + H2 —> NH3

Balanced Equation
- N2(g) + 3H2(g) —> 2NH3(g)

Question 3

Types of Chemical Reactions

Answer 3

1. Synthesis Reaction
   Compound is made from simpler materials

C(s) + O2(g) —> CO2(g)
Na(s) + Cl2(g) —>

A + B —> AB

2. **Decomposition **
   A compound is broken down into simpler compounds, or am the way down to the elements that make it.

AB —> A + B

3. **Combustion **
   A compound containing carbon and hydrogen (and sometimes oxygen) combined with oxygen gas to produce carbon dioxide and water.

CxHy(O2) + O2 —> CO2 + H2O

4. Single Replacement Reaction
   One element that starts out by itself replaces another element in a compound, kicking it out.

A + BC —> B + AC

5. Double Replacement Reaction
   The positive and negative ions in two compounds switch places.

AB + CD —> AD + BC