Activation energy and Endo /Exo

What is the activation energy?

• The energy of the products
• The energy of the reactants
• The minimum energy needed by the reactants to form the products.
• The energy lost in the reaction

Tags

NGSS.HS-PS1-4

Which letter corresponds to the energy of the products?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Which letter corresponds to the energy of the reactants?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-4

Increase in temperature of the reactants can do one of the following

• Slow collision frequency
• Allow less effective collision between the particles
• Cause particles to lose speed
• Increase collision between the particles thus increasing the rate.

Tags

NGSS.HS-PS1-5

Which factors increase the rate of a reaction.

• increasing temperature
• increasing concentration
• increasing surface area
• all of these

Tags

NGSS.HS-PS1-5

What type of reaction is this?

• Endothermic
• Exothermic

Tags

NGSS.HS-PS1-4

When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?

• The solution at the end is acidic

• The reaction is reversible

• The reaction is exothermic

• The reaction is endothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

• Endothermic

• Decomposition

• Exothermic

• Indothermic

Tags

NGSS.HS-PS1-4

What term is given to a reaction which transfers heat energy to the surroundings?

• Endothermic

• Reversible

• Exothermic

• Exotermic

Tags

NGSS.HS-PS1-4

How does a catalyst work in speeding up a reaction?

• By lowering the activation energy or reaction

• by giving them more energy

• by making them more available

Tags

NGSS.HS-PS1-5