Thermochemical Reactions

Determine the H for reaction of this equation: 3C (graphite) + 4 H2(g) --> C3H8(g)

• -683.4 kJ

• -2899.2 kJ

• -1324.7 kJ

• -104.0 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What is the Delta H if you reverse the reaction.

• 86 kJ

• - 86 kJ

• 68 kJ

• -68 kJ

Tags

NGSS.HS-PS1-4

Which of the following statements correctly describes an exothermic reaction?

Tags

NGSS.HS-PS3-4

Which of the following is a characteristic of an energy profile diagram for an exothermic reaction?

• The products are at a higher energy level than the reactants.

• The reactants are at a higher energy level than the products.

• The energy level of the reactants and products is the same.

• The activation energy is zero.

Tags

NGSS.HS-PS1-4

In an endothermic reaction, which of the following occurs?

• Bond making releases more energy than bond breaking.

• Bond breaking absorbs more energy than bond making releases.

• Bond making absorbs more energy than bond breaking releases.

• Bond breaking releases more energy than bond making absorbs.

Tags

NGSS.HS-PS1-4

What is the unit of molar enthalpy change?

• kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-7

What is the enthalpy change for a reaction if the energy required to break bonds is 500 kJ and the energy released in making bonds is 800 kJ?

Tags

NGSS.HS-PS1-4

• It is the energy change per mole of substance.

• It is the energy change per gram of mixture.

• It is the total energy change for the reaction.

• It is the energy change per litre of solution.

Tags

NGSS.HS-PS3-1

In an energy profile diagram, what does the peak of the curve represent?

• The energy of the reactants.

• The energy of the products.

• The activation energy.

• The enthalpy change of the reaction.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1