Thermochemistry Pre-Assessment

Does every collision between reactants result in the formation of products?

• Yes, anytime two reactant particles collide there will be products formed

• Yes, but only under the assumption that the reactants are compatible with each other

• No, because sometimes reactants do not release enough activation energy

• No, because sometimes reactants do not collide with enough force

Tags

NGSS.HS-PS1-5

The minimum amount of energy required to overcome the energy barrier in a chemical reaction is the

• heat of reaction

• KE of the reactants

• activation energy

• enthalpy of the products

What is the ΔH for the reverse reaction?

• +80 kJ/mol and it is endothermic

• -80 kJ/mol and it is exothermic

• +30 kJ/mol and it is endothermic

• -30 kJ/mol and it is exothermic

Tags

NGSS.HS-PS1-4

What is the ΔH for the FORWARD reaction?

• +80 kJ/mol and it is endothermic

• -80 kJ/mol and it is exothermic

• +30 kJ/mol and it is endothermic

• -30 kJ/mol and it is exothermic

Tags

NGSS.HS-PS1-4

What is the activation energy for the forward reaction?

• 100 kJ/mol

• 80 kJ/mol

• 50 kJ/mol

• 30 kJ/mol

Tags

NGSS.HS-PS1-4

What is the heat of reaction (total energy of the products)?

• 20 kJ/mol

• 50 kJ/mol

• 30 kJ/mol

• 80 kJ/mol

Tags

NGSS.HS-PS1-4

What is the total heat content of the reactants?

• 20 kJ/mol

• 50 kJ/mol

• 30 kJ/mol

• 80 kJ/mol

Tags

NGSS.HS-PS1-4

What is the potential energy of the activated complex?

• 20 kJ/mol

• 50 kJ/mol

• 80 kJ/mol

• 100 kJ/mol

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Which of the following changes will cause the rate of reaction to slow down?

• increasing reactant temperature

• addition of a catalyst to reactants

• decreasing reactant concentration

• increasing reactant surface area

Tags

NGSS.HS-PS1-5

Which of the following will have the highest rate of reaction?

• large chunk of zinc in 1.0 M HCl

• zinc powder in 1.0 M HCl

• large chunk of zinc in 1.5 M HCl

• zinc powder in 1.5 M HCl

Tags

NGSS.HS-PS1-5