Thermochemistry

ΔH value in an endothermic reaction is a positive number.

• True
• False

Are the products or reactants of this reaction storing more energy in their chemical bonds?

• Both storing the same

• No way to tell

• Products

• Reactants

What type of reaction is this?

• Exothermic

• Endothermic

• Energy Producing

• No way to tell

What kind of equation is this: 2KI + MgCl₂ + 200KJ ----> 2KCl + MgI₂

• Endothermic

• Exothermic

How can you tell this reaction is exothermic: MgO + CaS ----> CaO + MgS + 200 KJ

• Energy is written on the products side

• Energy is being released

• Less energy is stored on product side

• All of these tell me

Why does a higher temperature increase the rate of a reaction?

• it increases both the frequency and energy of particle collisions
• it only increases the frequency of particle collisions
• it only increases the energy of particle collisions
• it reduces the activation energy of the reaction

What is collision theory?

• Molecules must collide in the correct orientation with enough energy to bond.

• Molecules need enough energy to collide and react.

• Atoms constantly collide and react.

• The minimum energy needed for atoms to react

____ reactions usually feel cold.

• endothermic

• exothermic

What type of reaction occurs in a hand warmer

• exothermic
• endothermic

In cellular respiration, the products of the reaction are glucose, oxygen gas, and ATP (energy). Would cellular respiration be considered endo- or exothermic?

• endothermic

• exothermic