Davina Chemistry Exam Questions

Which of the following does NOT affect the rate of a chemical reaction?

• Temperature

• Concentration

• Colour of reactants

• Presence of a catalyst

Which of these increases the rate of a reaction by lowering activation energy?

• Inhibitor

• Catalyst

• Pressure

• Temperature

An increase in surface area of a solid reactant will...

• decrease the rate of reaction

• have no effect

• increase the rate of reaction

• stop the reaction

What happens to the rate of a reaction when temperature is increased?

• It remains the same

• It decreases

• It increases

• It stops

In a gaseous reaction, increasing the pressure will...

• reduce the product yield

• increase the rate

• slow down the reaction

• break chemical bonds

The minimum energy needed for a reaction to occur is called...

• threshold energy

• reaction energy

• kinetic energy

• activation energy

What method is commonly used to measure the rate of gas evolution in reactions?

• Thermometer

• Burette

• Gas syringe

• Beaker

Which factor does not affect the rate of a reaction in a liquid-phase system?

• Pressure

• Catalyst

• Temperature

• Concentration

Which of the following will slow down the rate of a chemical reaction?

• Use of powdered reactants

• Increase in temperature

• Use of a catalyst

• Decrease in concentration

Collision theory states that...

• All collisions result in reactions

• Particles must collide with sufficient energy and correct orientation

• Only molecules in the liquid phase react

• Reactions only occur in open systems