Form 4 Chemistry Chapter 7_Rate of Reaction

What describes a reaction?

• Products react and become reactants.

• Reactants react and become products.

• Reactants and products react and become new reactants.

• Reactants and products react and become new products.

To determine the rate of reaction what should you measure?

• How fast are the products forming.

• How fast are the reactants being consumed.

• How fast is the catalyst working.

Changes occur when a reaction is happening. We can measure these changes and determine the rate of reaction. What are the typical changes during a reaction?

• Formation of precipitate

• Increase in the mass of reactants

• Decrease in the mass of reactants

• Increase in the volume of product (gas)

Sodium hydroxide (NaOH) and hydrochloric acid (HCl) react to produce sodium chloride (NaCl), water (H₂O) and heat. What are the reactants in this reaction?

• Sodium hydroxide (NaOH)

• Hydrochloric acid (HCl)

• Sodium chloride (NaCl)

• Water (H₂O)

• Heat

Sodium hydroxide (NaOH) and hydrochloric acid (HCl) react to produce sodium chloride (NaCl), water (H₂O) and heat. What are the products in this reaction?

• Sodium hydroxide (NaOH)

• Hydrochloric acid (HCl)

• Sodium chloride (NaCl)

• Water (H₂O)

• Heat

A reaction between an acid and a reactive metal released 200 dm³ of hydrogen gas in 5 minute. What is the overall rate of reaction?

• 6.667 dm³/s

• 0.667 dm³/s

• 40 dm³/s

• 0.4 dm³/s

At the second minute of that reaction it was measured to have released 125 dm³ hydrogen gas. What is the rate of reaction for the first 2 minutes?

• 62.5 dm³/s

• 10.4 dm³/s

• 1.04 dm³/s

• 100 dm³/s

Which of these factors would increase rate of a reaction?

• Decreasing the size of the reactants

• Increasing the concentration of reactants

• Increasing temperature

• Presence of catalyst

Siti wants to cook potato stew. She needs the potatoes to cook faster. What can she do?

• Cut the potatoes smaller.

• Cook it at lower temperature,

• Cook it in pressure cooker.

What needs to happen in order for a reaction to occur according to collision theory?

• Reactants must collide with each other

• Reactants must collide at correct orientation

• Reactants must collide with enough energy to reach or surpass activation energy.

• Reactants must all collide simultaneously.