Problem based on collision theory

Question

Question 1: On a potential energy diagram, what is true about activation energy?

• Activation energy is the same for both endothermic and exothermic reactions.
• Activation energy is greater for endothermic reactions.
• Activation energy is greater for exothermic reactions.
• Activation energy is represented by a negative slope.

Question 2: According to the collision theory and model created to explain the collision theory, why does a catalyst cause a reaction to speed up?

• It lowers the activation energy.
• It increases the collisions per minute.
• It increases the average kinetic energy of the particles.
• It increases the kinetic energy and the collisions per minute.

Question 3: If it requires 37.5 mL of a 0. 245 M HBr solution to neutralize 18.0 mL Mg(OH)2, what is the concentration of the Mg(OH) 2 solution?

2 HBr + Mg(OH) 2 Mg(Br)₂ + 2 H₂O

• 0.0120 M
• 0.0255 M
• 0.118 M
• 0.510 M

Question 4: Which of the following chemical reactions is an oxidation-reduction reaction?

• NO + 2H₂ NH₃ + H₂O
• NaNO₃ + LiF LiNO₃ + NaF
• CaSO4 + 2KBr K₂SO₄ + CaBr2
• AgNO₃ + 2HCl AgCl + 2HNO₃

Question 5: Heat from the Earth s core and pressure on the remains of dead plants and animals create which of the following resources?

• biofuel and hydro-electric
• natural gas and coal
• nuclear power and geothermal
• geothermal power and biofuel