Chemistry - Chemical Equations and Balancing

What is the product of hydrogen and oxygen?

• Water (H₂O)

• Hydrogen Peroxide (H₂O₂)

• Ozone (O₃)

• Hydrochloric Acid (HCl)

What is the formula for sodium hydroxide?

• NaOH

• NaH

• Na2O

• NaCl

What is the third step in balancing a chemical equation?

• Check Again to ensure balance.

• Count the number of atoms on each side.

• Write the unbalanced equation.

• Add coefficients to the reactants.

How do you balance a chemical equation?

• By ensuring the number of atoms on both sides is equal.

• By changing the chemical formulas of the reactants.

• By adding more products than reactants.

• By ignoring the law of conservation of mass.

What is the formula for sodium chloride?

• NaCl

• KCl

• CaCl2

• MgCl2

What is the significance of the arrow in a chemical equation?

• It indicates the direction of the reaction.

• It separates reactants from products.

• It shows the temperature of the reaction.

• It represents the catalyst used in the reaction.

What is a common method for balancing complex equations?

• Use algebraic methods or trial and error.

• Only use trial and error without any calculations.

• Ignore the equations and guess the answers.

• Use graphical methods exclusively.

What is an example of a balanced equation?

• C + O₂ → CO₂.

• C + O₂ → 2CO

• 2C + O₂ → CO₂

• C + 2O₂ → CO₂

Balance the equation: HCl + NaOH → NaCl + H₂O

• HCl + NaOH → NaCl + H₂O (Already balanced)

• HCl + NaOH → NaCl + H₂O (Unbalanced)

• 2 HCl + NaOH → 2 NaCl + H₂O

• HCl + 2 NaOH → NaCl + H₂O

Balance the equation: H₂ + O₂ → H₂O

• H₂ + O₂ → H₂O

• 2H₂ + O₂ → H₂O

• 2H₂ + O₂ → 2H₂O

• H₂ + 2O₂ → H₂O