Question

Which of the following are chemical changes:
-Burning a chemistry book
-Carving a turkey
-Pounding a block of aluminum into foil
-Baking a turkey

Answer 1

i think just burning is chemical change?

Answer 2

A turkey baking is a chemical change too. Can see helpful diagram at website yes?

http://www.ric.edu/faculty/ptiskus/chemical/

Answer 3

Burning a chemistry book.

Answer 4

A chemical change occurs when one or more of the substances are changed into another substance through a chemical reaction. There are four clues that alert you to the presence of a chemical reaction:
-Color changes
-Energy absorbed or released
-Odor is emitted
-Bubbling occurs
A chemical change does not occur when only the form, shape, or physical state (solid, liquid, gas) of a substance changes.
Thus,
-Burning a chemistry book (A chemical change occurs. A combustion reaction is occurs that is transforming the paper into ash. Energy is released from the burning of the book. The paper turns black.)
-Carving a turkey (No chemical change occurs. The turkey being sliced is only changing in shape.)
-Pounding a block of aluminum into foil. (No chemical change occurs. The block of aluminum being pounded is only changing in shape.)
-Baking a turkey (A chemical change occurs. The turkey is chemically transformed by the heat. Its color changes and the meat absorbs energy)

Answer 5

Thank you! That explains it so much better to me! I can actually understand that! Thank you again!

Answer 6

You are very welcome. My pleasure. ;)