Conservation of Mass

What happens to atoms during a chemical reaction?

• Atoms are created and destroyed during a chemical reaction.

• Atoms are rearranged during a chemical reaction; they do not disappear or change into different atoms.

• Atoms change into different types of atoms during a chemical reaction.

• Atoms remain unchanged and do not interact with each other.

What is a reactant in a chemical reaction?

• A substance that is produced during a chemical reaction.

• A substance that undergoes change during a chemical reaction, appearing on the left side of a chemical equation.

• A catalyst that speeds up the reaction without being consumed.

• A byproduct that is formed after the reaction is complete.

What is an example of a chemical change?

• Rust forming on iron.

• Melting of ice.

• Boiling water.

• Chopping wood.

What is the law of conservation of mass?

• The law states that mass can be created in a chemical reaction.

• The law states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

• The law states that the mass of products is always greater than the mass of reactants.

• The law states that mass can be transformed into energy during a chemical reaction.

What is a chemical equation?

• A symbolic representation of a chemical reaction, showing the reactants and products along with their coefficients.

• A numerical representation of a chemical reaction without any symbols.

• A graphical representation of the physical state of reactants and products.

• A written description of a chemical reaction in everyday language.

Why is it important to understand the conservation of mass in chemistry?

• It helps in predicting the outcomes of chemical reactions and conducting experiments accurately.

• It allows chemists to create new elements from existing ones.

• It is only relevant for physical changes, not chemical reactions.

• It simplifies the process of balancing chemical equations.

What is the significance of balancing chemical equations?

• It allows for the creation of new elements.

• It reflects the conservation of mass and allows for accurate stoichiometric calculations.

• It simplifies the process of chemical reactions.

• It helps in predicting the color of chemical reactions.

How do you balance a chemical equation?

• By changing the subscripts of the compounds involved.

• By adjusting the coefficients of the reactants and products so that the number of atoms of each element is the same on both sides of the equation.

• By adding extra elements to one side of the equation.

• By using a calculator to determine the correct ratios.

What is an example of a balanced chemical equation?

• H2 + O2 → H2O

• 2H2 + O2 → 2H2O

• H2 + O2 → 2H2O2

• 2H2 + O2 → H2O2

What is a product in a chemical reaction?

• A substance that is formed as a result of a chemical reaction, appearing on the right side of a chemical equation.

• A substance that is consumed during a chemical reaction, appearing on the left side of a chemical equation.

• A catalyst that speeds up the chemical reaction without being consumed.

• A mixture of reactants that does not undergo any change during the reaction.