Endothermic and Exothermic Processes

Endothermic and Exothermic Processes

Introduction to the energy unit

Multiple Choice

Energy that transfers from one substance to another until the temperatures are equal is called...

• free energy

• temperature

• entropy

• heat

Multiple Choice

Which of the following describes the heat transfer when you hold an ice cube in your hand?

• from the cold ice cube to your warm hand

• the cold ice cube makes your hand cold

• from your warm hand to the cold ice cube

• no heat transfer occurs

Multiple Choice

Water molecules have the greatest kinetic energy in

________________

• ice at 0 °C.

• liquid ater at 373 K.

• liquid water at 98 °C

• steam at 150 °C.

Multiple Choice

A hot marble is dropped into a container of cool water. Which of the following statements most accurately describes the molecular motion of molecules?

• Both the marble molecules and the water molecules will slow down until they eventually come to rest.

• The marble molecules will slow down while the water molecules speed up until they reach reach the same average kinetic energy.

• The marble molecules will speed up while the water molecules will slow down until they reach nearly identical speeds.

• Both the marble molecules and the water molecules will speed up until they reach nearly identical speeds.

Multiple Choice

The SI unit of heat and energy is the __________.

• calorie

• Becquerel

• joule

• watt

Multiple Choice

What unit do you use to measure heat?

• J/Kg ºC

• Kg

• ºC

• J

Multiple Choice

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

• The final temperature is lower than the original temperature.

• The reaction is reversible

• The reaction is exothermic

• The reaction is endothermic

Multiple Choice

Do reactants in an endothermic reaction have a higher or lower energy than the products? 

• Higher
• Lower

Multiple Choice

In an endothermic reaction, heat is ...

• taken in or absorbed
• given out or released 

Multiple Choice

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

Multiple Choice

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

• Endothermic

• Exothermic

Multiple Choice

C₆ H₁₂ 0₆ + 6O₂ ⟶ 6CO₂ + 6H₂0 + energy

• endothermic reaction

• exothermic reaction