#1. We inhale oxygen and exhale carbon dioxide as a result of a ______ change in our bodies.
a.physical/ b. chemical


#2. Please select the best answer from the choices provided

A Which of the following is an example of a chemical change?
a.ice melting/b. pounding gold into a coin/ c.milk souring/d.a puddle of water evaporating


#3. Please select the best answer from the choices provided
Which of the following is an example of a physical change?
a.dissolving salt in water./ b. cooking an egg./c.burning wood into charcoal./d.rusting iron.


#4. What kind of chemical change involves breaking down substances using electricity?
a. Electrothermic/ b.Electrolysis /c.Exothermic /d. Electrodecomp


#5. Which of the following is an example of a chemical change?

a.ice melting/ b.milk souring/ c.pounding gold into a coin/ d.a puddle of water evaporating

#6. Which of the following is an example of a physical change?
a.dissolving salt in water./b.burning wood into charcoal./c.cooking an egg./d.rusting iron.


#7. What kind of chemical change involves breaking down substances using electricity?
a.Electrothermic/ b.Exothermic/c.Electrolysis/ d.Electrodecomp

#8. What chemical change occurs when a more reactive substance replaces a less reactive substance in a compound?
a. Oxidative/ b.Displacement/c.Reduction/ d.Endothermic