Please help me!! need help with homework due tomorrow?

I have 7 worksheets and these are some of the questions I can't get from them..

please help me with as much as you can

thanks!! :)



1. Explain where the energy to cook food comes from when a gas stove burns natural gas, Ch4 and Oxygen, O2.



2. Predict the products of the decomposition reactions of the following substances:

Mercury Oxide, HgO

Silver Oxidem Ag2O



3. A reaction in which the products contain more chemical energy than the reactants is

a. exothermic

b. electrical

c. endothermic

d. exergonic



4. Which of these represents the release of chemical energy?

a. pouring gasoline into a tank

b. burning charcoal in a grill

c. a toy car running down a ramp

d. warming food in a microwave



5. Which of the following are the products of reactants of a chemical reaction most likely to have in common?

a. atoms

b.molecules

c.physical properties

d. chemical properties



6. Which of the following occurs when gasoline is burned?

a. New elements are formed

b. New atoms are formed

c. New molecules are formed

d.all of the above



7. Explain how you can determine if a chemical reaction represents a single replacement reaction or a double replacement reaction.



8. Explain why charcoal grills or charcoal fires should never be used for heating inside a house. (Hint: Doors and windows are closed when it is cold, so there is little fresh air.)



9. List three possible results of a double-displacement reaction.



10. Compare and Contrast single -displacement and double-displacement reactions based on the number of reactants. Use the terms compounds, atom or element, and ion.Please help me!! need help with homework due tomorrow?
1) The bonds in the gas break releasing heat energy which cooks the food.

3) Endothermic

4) b

5) a

6) c

8) It will burn up the oxygen in the room causing breathing difficulties and possibly suffocation