Posted on February 8, 2010.
Will you check my answers? Say whether the following statements are physical or chemical reactions. P = C Chemical Physics
The erosion of a bed of water-P
carve a marble statue-p
melting ice-cream p
a cake-c
a flash flash-c
cooking waffles-c
mothballs disappear with time-c
a red mark appears after a bee sting-c
leaves change color-c
sanding a piece of wood-p
firework, c
Melt the chocolate-p
vinegar mixed with baking soda-c
a match-c
photosynthesis in plants-p
a drop of hydrochloric acid on marble produces carbon dioxide gas-c
Sodium hydroxide dissolves in water-p
hyrdrochloric acid reacts with sodium hydroxide to produce a salt, water and heat c
a pellet of sodium is cut into two-p
Water is heated and changed to steam-p
Potassium chlorate decomposes into potassium chloride and oxygen gas-c
iron rust-c
Melting ice-p
acid on the limestone produces carbon dioxide gas-c
milk sours-p
Wood rots-p
I really wish I could, because I really enjoyed your good use of Y! In doing your homework first, then he announces for the correction. It is so refreshing to see a student does not cheat!
Unfortunately, I'm not quite sure of my knowledge of using on each. I know you've got the far right.
+++++++++++++++ aaaaaaaaaaaaaaaaaaaaaaaaa all right ...
Excellent! Very good you all right! you are very intelligent! keep the good work!
I think you can double-check this:
mothballs disappear with time-c
[I'm fairly certain that naphthalene is volatile. Meaning, they evaporate at room temperature. Sublimation.]
photosynthesis in plants-p
[Photosynthesis is a chemical process]
milk sours-p
[This is caused by a bacterium or adding an] acid
Wood rots-p
[Caused by fungi and other organisms]
Oh, and I agree. Checking your work rather than asking for answers? Very cool:]
