Balancing Equations Practice

What is a balanced chemical equation?

• A balanced chemical equation has different numbers of atoms on each side of the equation.

• A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved during a chemical reaction.

• A balanced chemical equation only applies to reactions in a closed system.

• A balanced chemical equation shows the speed of a chemical reaction.

What is the purpose of balancing chemical equations?

• To ensure that the law of conservation of mass is upheld and accurately represents the quantities of reactants and products.

• To increase the speed of chemical reactions.

• To determine the temperature at which a reaction occurs.

• To identify the physical states of reactants and products.

What is the balanced form of SnO2 + H2 → Sn + H2O?

• 1 SnO2 + 2 H2 → 1 Sn + 2 H2O.

• 2 SnO2 + 4 H2 → 2 Sn + 4 H2O.

• 1 SnO2 + 1 H2 → 1 Sn + 1 H2O.

• 2 SnO2 + 2 H2 → 2 Sn + 2 H2O.

What is the balanced equation for Fe + H2SO4 → Fe2(SO4)3 + H2?

• 2 Fe + 6 H2SO4 → 1 Fe2(SO4)3 + 3 H2

• 3 Fe + 4 H2SO4 → 1 Fe2(SO4)3 + 2 H2

• 2 Fe + 3 H2SO4 → 1 Fe2(SO4)3 + 2 H2

• Fe + 2 H2SO4 → 1 Fe2(SO4)3 + 1 H2

What is the law of conservation of mass?

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

• The law states that mass cannot be created or destroyed in a chemical reaction; therefore, the mass of reactants must equal the mass of products.

• The law states that mass is only conserved in physical changes, not chemical reactions.

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

How do you balance the equation C2H6 + O2 → H2O + CO2?

• By adjusting the coefficients to ensure the same number of each type of atom on both sides, you find that 2 H2O and 2 CO2 are produced.

• By using 1 C2H6 and 3 O2 to produce 2 H2O and 1 CO2.

• By balancing the hydrogen first, then the carbon, and finally the oxygen, resulting in 1 H2O and 1 CO2.

• By adding coefficients of 2 for C2H6 and O2, resulting in 4 H2O and 2 CO2.

What does it mean if a reaction is exothermic?

• An exothermic reaction absorbs energy from the surroundings.

• An exothermic reaction releases energy, usually in the form of heat, to the surroundings.

• An exothermic reaction occurs only in gases.

• An exothermic reaction requires heat to proceed.

What is the role of water in a chemical reaction?

• Water acts solely as a product in all reactions.

• Water can act as a solvent, a reactant, or a product in chemical reactions, depending on the context.

• Water is only a reactant and never a product.

• Water has no role in chemical reactions.

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 the equation.

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

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

What is the first step in balancing a chemical equation?

• Identify the number of atoms of each element in the reactants and products.

• Write the unbalanced equation for the reaction.

• Add coefficients to the reactants and products.

• Check the final equation for accuracy.