Chemical Equations for 10th Class

What is the process of balancing a chemical equation?

• Balancing a chemical equation requires changing the state of matter of the compounds

• Balancing a chemical equation involves adjusting the coefficients of the compounds to ensure the same number of atoms of each element on both sides of the equation.

• Balancing a chemical equation involves changing the chemical formula of the compounds

• Balancing a chemical equation means adding or removing elements from the compounds

Provide an example of a balanced chemical equation.

• 2H₂ + O₂ -> 2H₂O

• H2 + O2 -> H2O

• 2H2O -> 2H2 + O2

• 2H2 + O2 -> H2O

What are the different types of chemical reactions?

• Addition, subtraction, multiplication, division

• Oxidation, reduction, neutralization

• Solid, liquid, gas

• Synthesis, decomposition, single displacement, double displacement, combustion

Explain what a redox reaction is.

• A redox reaction involves the absorption of light

• A redox reaction involves the release of energy

• A redox reaction involves the transfer of electrons between two species.

• A redox reaction involves the formation of a new compound

Give an example of a redox reaction.

• Iron + Oxygen → Iron oxide

• Zinc + Sulfuric acid → Zinc sulfate + Hydrogen gas

• Sodium chloride + Water → Sodium hydroxide + Chlorine gas

• Copper oxide + Carbon → Copper + Carbon dioxide

Define combustion reactions.

• Biological reactions involving a fuel and an oxidant resulting in light and heat release.

• Chemical reactions involving a solid and a liquid resulting in light release.

• Chemical reactions involving a fuel and an oxidant resulting in heat and light release.

• Physical reactions involving a fuel and an oxidant resulting in heat and sound release.

What are the products of a combustion reaction involving hydrocarbons?

• Carbon dioxide and water

• Carbon monoxide and nitrogen oxides

• Nitrogen and sulfur dioxide

• Methane and oxygen

How can you identify a combustion reaction?

• Identify a combustion reaction by the absence of oxygen

• Identify a combustion reaction by looking for the presence of a fuel (hydrocarbon), oxygen, and the production of carbon dioxide and water as products.

• Identify a combustion reaction by the production of nitrogen gas

• Identify a combustion reaction by the presence of a catalyst

Balance the following chemical equation: C3H8 + O2 -> CO2 + H2O

• C3H8 + 6O2 -> 3CO2 + 4H2O

• C3H8 + 4O2 -> 3CO2 + 4H2O

• C3H8 + O2 -> 2CO2 + 2H2O

• C3H8 + 5O2 -> 3CO2 + 4H2O

Identify the type of reaction: 2H2 + O2 -> 2H2O

• Decomposition reaction

• Combustion reaction

• Single displacement reaction

• Synthesis reaction