Exploring Chemical Reactions

What are the four main types of chemical reactions?

• Photolysis

• Synthesis, Decomposition, Single Replacement, Double Replacement

• Redox

• Neutralization

• Combustion

Define a synthesis reaction and provide an example.

• The decomposition of water: 2H₂O → 2H₂ + O₂.

• The combustion of methane: CH₄ + 2O₂ → CO₂ + 2H₂O.

• The reaction of sodium and chlorine: 2Na + Cl₂ → 2NaCl.

• An example of a synthesis reaction is the formation of water: 2H₂ + O₂ → 2H₂O.

How do you balance the equation H2 + O2 → H2O?

• 2 H2 + O2 → 2 H2O

• H2 + O2 → 2 H2O

• 2 H2 + 2 O2 → 2 H2O

• H2 + O2 → H2O

What is the general form of a decomposition reaction?

• A + B -> C

• AB + C -> A + B + C

• AB -> A + B

• A + B -> AB

What is produced when an acid reacts with a base?

• Carbon dioxide and water

• Ammonia and salt

• Water and salt

• Hydrogen and oxygen

Explain the difference between strong and weak acids.

• Weak acids do not conduct electricity in solution.

• Strong acids are always more corrosive than weak acids.

• Strong acids fully dissociate in solution; weak acids partially dissociate.

• Strong acids have a higher pH than weak acids.

Write the balanced equation for the combustion of methane.

• CH4 + 3 O2 -> 2 CO2 + 2 H2O

• CH4 + 2 O2 -> CO2 + 2 H2O

• C2H6 + O2 -> 2 CO2 + 3 H2O

• CH4 + O2 -> CO + H2O

What type of reaction is represented by the equation 2Na + Cl2 → 2NaCl?

• Synthesis reaction

• Single replacement reaction

• Decomposition reaction

• Double replacement reaction

Describe the process of neutralization in acid-base reactions.

• Neutralization is the reaction between an acid and a base to produce water and a salt.

• Neutralization occurs when a base reacts with another base to form a liquid.

• Neutralization is the process of evaporating acids to form gases.

• Neutralization involves mixing two acids to create a stronger acid.

What are the products of the combustion of hydrocarbons?

• Hydrogen and sulfur

• Carbon dioxide and water, with possible carbon monoxide and soot in incomplete combustion.

• Methane and ethane

• Oxygen and nitrogen