#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?

AElectrothermic/ 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?

AOxidative/ b.Displacement/c.Reduction/ d.Endothermic