Chemical Reactions

Which statement does not indicate a reversible reaction?

• Products can be reverted back to reactants

• The equation uses this symbol: →

• Haber process

• Occur in both directions

What happens to a reaction when heat is increased?

• Particles collides with less frequency

• Particles have less kinetic energy

• More particles reach the activation energy

• Rate of successful collision is lesser

What is represented by the letter Y?

• Reactant level

• Activation energy

• Products

• Energy change

Complete the sentence. In a reversible reaction, a high pressure....

• favors the side with higher moles

• increases rate of only forward reaction

• increases rate of only reverse reaction

• increases rate of forward and reverse reaction

What is the effect of a catalyst on a chemical reaction?

• Decreases the activation energy

• Increases the activation energy

• Slows down the reaction rate

• Has no impact on the reaction rate

What is the role of enzymes in biological reactions?

• Decrease reaction rate

• Provide energy for reactions

• Act as catalysts

• Prevent reactions from occurring

Choose the correct conditions for Haber process.

• 450^oC, 200atm, iron as catalyst

• 450^oC, 200kPa, iron as catalyst

• 400^oC, 200atm, iron as catalyst

• 450^oC, 200atm, vanadium (V) oxide as catalyst

What is the effect of increasing the concentration of reactants in a chemical reaction?

• Decreases the reaction rate

• Increases the reaction rate

• Has no impact on the reaction rate

• Changes the activation energy

Anhydrous copper (II) sulphate is added with water. State the colour change that can be observed.

• Blue to white

• Pink to blue

• White to blue

• Blue to pink

State a term suitable for this statement. "A system where no substances goes in or out".

• Open system

• Closed system

• Haber process

• Reversible reaction