Chemical Equations and Reactions

What is a chemical equation?

• A chemical equation is a mathematical equation that describes the relationship between reactants and products.

• A chemical equation is a symbolic representation of a chemical reaction.

• A chemical equation is a diagram that shows the structure of a molecule.

• A chemical equation is a measurement of the amount of a substance in a given volume.

Why is it important to balance chemical equations?

• To make the equation look more balanced.

• To confuse students.

• To waste time in chemistry class.

• To obey the law of conservation of mass.

Balance the following equation: H2 + O2 -> H2O

• H2O2 -> H2 + O2

• H2O -> H2 + O2

• 2H2 + O2 -> 2H2O

• H2 + O2 -> H2O

What are the different types of chemical reactions?

• synthesis, decomposition, single displacement, double displacement, combustion, and redox

• acid-base, precipitation, substitution, addition, elimination, and isomerization

• neutralization, hydrolysis, substitution, addition, elimination, and polymerization

• oxidation, reduction, hydrolysis, condensation, polymerization, and isomerization

Classify the following reaction: 2Na + Cl2 -> 2NaCl

• Combination reaction

• Double replacement reaction

• Single replacement reaction

• Decomposition reaction

What is the law of conservation of mass?

• Mass is always conserved in a chemical reaction.

• Mass cannot be created or destroyed in a chemical reaction.

• Mass can be created or destroyed in a chemical reaction.

• The law of conservation of mass only applies to physical changes.

Balance the equation: Fe + O2 -> Fe2O3

• Fe + O2 -> Fe3O2

• Fe + O2 -> FeO2

• Fe2 + O2 -> Fe2O3

• 2Fe + O2 -> Fe2O3

What is a synthesis reaction?

• A synthesis reaction is a type of chemical reaction where a complex substance breaks down into two or more simpler substances.

• A synthesis reaction is a type of chemical reaction where two or more simple substances combine to form a more complex substance.

• A synthesis reaction is a type of chemical reaction where two or more complex substances combine to form a simpler substance.

• A synthesis reaction is a type of chemical reaction where two or more simple substances break down into a more complex substance.

Classify the reaction: CH4 + 2O2 -> CO2 + 2H2O

• Combustion reaction

• Synthesis reaction

• Decomposition reaction

• Neutralization reaction

What is a decomposition reaction?

• A decomposition reaction is a type of chemical reaction where a compound releases energy in the form of heat and light.

• A decomposition reaction is a type of chemical reaction where a compound undergoes a phase change from solid to liquid.

• A decomposition reaction is a type of chemical reaction where a compound breaks down into simpler substances or elements.

• A decomposition reaction is a type of chemical reaction where a compound combines with another compound to form a more complex substance.