5.3 PSci Notes

Multiple Choice

The initial energy required to start a combustion reaction (or any reaction type!) is called "_______"

• Potential Energy

• Kinetic Energy

• Chemical Potential Energy

• Activation Energy

Multiple Choice

All combustion reactions are 

• endothermic

• exothermic

• neutral

• fast

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

• 200 kJ of energy is released in the products side

• 200 kJ of energy is created from mass at the end

• The atoms balance out on both sides of the equation

Multiple Choice

What kind of reaction is this?

2 KI + MgCl₂ + 200KJ ----> 2 KCl + MgI₂

• Endothermic

• Exothermic

Multiple Choice

If a chemical reaction is EXOTHERMIC, the temperature would....

• Stay the same

• Increase

• Decrease

Multiple Choice

Which is NOT an example of chemical change?

• production of gas.

• change in color.

• change in size.

• transfer of energy.