Chemical Reactions Quiz

What is a chemical reaction?

• A process that does not involve any compounds

• A process that forms new compounds

• A process that only changes the state of matter

• A process that involves only physical changes

Which of the following is an example of a combination reaction?

• HCl + NaOH → NaCl + H₂O

• Na + Cl₂ → 2NaCl

• Zn + 2HCl → ZnCl₂ + H₂

• 2H₂O → 2H₂ + O₂

In a decomposition reaction, what happens to the compound?

• It remains unchanged

• It exchanges elements with another compound

• It breaks down into its base elements

• It combines with another compound

What type of reaction is represented by the equation AB + C → A + BC?

• Single Displacement Reaction

• Decomposition Reaction

• Double Displacement Reaction

• Combination Reaction

Which of the following is a characteristic of combustion reactions?

• They only occur in the absence of oxygen

• They break down compounds

• They involve the exchange of elements

• They produce heat and light

What is the product of the reaction HCl + NaOH?

• NaCl and O₂

• HCl and Na

• H₂ and Cl₂

• NaCl and H₂O

Which of the following best describes polymerization?

• A simple exchange of elements

• A reaction that breaks down compounds

• A process involving radicals to form plastics

• A reaction that produces heat and light

What is the general form of a combination reaction?

• AB → A + B

• A + B → AB

• AB + C → A + BC

• AB + CD → AD + BC

What is the role of reactants in a chemical equation?

• They are the products formed

• They are the catalysts used

• They are the starting materials

• They are the byproducts

How many atoms are there in 22 moles of Hydrogen (H)?

• 22 mol x (6.023x10²³ atoms / mol)

• 22 moles / (6.023x10²³ atoms / mol)

• 22 moles + (6.023x10²³ atoms / mol)

• 22 moles - (6.023x10²³ atoms / mol)