CHM1025C Module One: Sample Exam Homework

Part D: Chemical/Physical/Nuclear Change 5 points

State whether each of the following is a physical change, a chemical change, or a nuclear change:

 

__________________1. Electricity decomposes water.

 

 

__________________ 2. Methanol dissolves in gasoline

 

 

__________________ 3. Dry ice pellets disappear

 

 

__________________ 4. Iron oxidizes to rust

 

 

__________________ 5. Bromine vaporizes into a reddish-brown gas

 

 

__________________ 6. Uranium-235 splits into two small elements when bombarded

with neutrons in an atomic bomb.

 

___________________7. Copper conducts heat

 

 

___________________8. Baking soda fizzes in vinegar

 

 

___________________9. Grinding sugar crystals into a powder

 

 

__________________10. Sodium reacts with chlorine gas

 

 

__________________11. Adding air to a tire

 

 

__________________12. Slicing an orange into wedges

 

 

__________________13. Hydrogen atoms fuse into helium atoms in a hydrogen bomb

 

 

__________________14. Dry ice(Solid Carbon dioxide) vaporizes into a gas at room

temperature and sea level pressure

 

__________________15. Natural Gas burs with a blue flame