Fun with Chemical Reactions

What is a chemical reaction?

• A chemical reaction is a process where substances (reactants) are transformed into different substances (products) through the rearrangement of atoms.

• A chemical reaction is a process that only occurs in living organisms.

• A chemical reaction is the mixing of two substances without any change.

• A chemical reaction is when substances are combined to form a mixture.

Can you name one example of a chemical reaction?

• Combustion of methane (CH4 + O2 -> CO2 + H2O)

• Photosynthesis of plants

• Rusting of iron

• Dissolving sugar in water

What do we call the substances we start with in a chemical reaction?

• Reactants

• Solvents

• Catalysts

• Products

What do we call the new substances formed in a chemical reaction?

• Products

• Solvents

• Catalysts

• Reagents

Is burning wood a chemical reaction?

• Burning wood does not involve any new substances.

• Burning wood is a physical change.

• Burning wood produces only heat and light.

• Yes, burning wood is a chemical reaction.

What happens to the molecules during a chemical reaction?

• The molecules disappear completely.

• The molecules combine to form larger molecules without changing.

• The molecules remain unchanged throughout the reaction.

• The molecules rearrange to form new substances.

What is the purpose of a chemical equation?

• To represent a chemical reaction and the relationship between reactants and products.

• To provide safety instructions for handling chemicals.

• To list the ingredients of a chemical compound.

• To describe the physical properties of substances.

Can you identify a chemical change from a physical change?

• Yes, a chemical change can be identified from a physical change.

• Physical changes are always reversible, while chemical changes are not.

• Chemical changes do not involve the formation of new substances.

• A chemical change cannot be identified from a physical change.

What is the law of conservation of mass?

• Mass is lost during physical changes.

• Mass is only relevant in biological processes.

• Mass is conserved in chemical reactions; it cannot be created or destroyed.

• Mass can be created in chemical reactions.

Why is it important to balance a chemical equation?

• To simplify the equation for easier reading.

• To change the products of the reaction.

• To increase the speed of the reaction.

• It is important to balance a chemical equation to ensure the conservation of mass and to provide accurate stoichiometric ratios.