Balancing equations and chemical reactions.

The equation below represents an unbalanced chemical reaction. When the equation is balanced, which coefficient should be placed before NaCl?

NaI + Cl₂ → NaCl + I₂

• 2

• 3

• 4

• 5

Which is a correctly balanced chemical equation?

• CuCl₂ + Al → AlCl₃ + 2Cu

• 2CuCl₂ + 3Al → AlCl₃ + 3Cu

• 3CuCl₂ + 2Al → 2AlCl₃ + 3Cu

• 2CuCl₂ + Al → AlCl₃ + 2Cu

The equation below represents a balanced chemical reaction. Which type of chemical reaction is represented?

BaCl₂ + MgSO₄ → BaSO₄ + MgCl₂

• double replacement

• single replacement

• decomposition

• synthesis

What is the coefficient of iron when the following chemical equation is balanced?

Fe + Cl₂ →FeCl₃

• 1

• 2

• 3

• 4

Which of the following is a decomposition reaction?

• 2H₂O → 2H₂ + O₂

• Mg + 2HCl → MgCl₂ + H₂

• 2Cu + O₂ → 2CuO

• HCl + NaOH → NaCl +H₂O

In a chemical reaction, what is the relationship between the total mass of atoms for reactants and the total mass of atoms products?

• They must be equal.

• The mass of the products must be greater.

• The mass of the reactants must be greater.

• There is no general relationship between the two.

What is the general form for a single-replacement reaction?

• AB+ CD → AD + CB

• AB → A + B

• A + B → AB

• A + BC → AC + B

Which of the following best describes the reaction below?

CaO+ H₂O→ Ca(OH)₂

• decomposition

• single replacement

• synthesis

• double replacement

Which of the following best describes the reaction below?

CH₄ + 2O₂ → CO₂ + 2H₂O

• combustion

• decomposition

• single replacement

• double replacement

Which of the following best describes the reaction below?

KBr + AgNO₃ → KNO₃ + AgBr

• synthesis

• decomposition

• double replacement

• single replacement