Okay, there are 20 questions, please answer as many as you can.-(By the way this is on Chemical Physical Changes/C and P properties)
1. Describe the ways that burning changes the nature of wood.
2. A substance always has _______ properties, even though they are difficult to observe.
3. Scientists use __________ properties to help them identify and clasify matter.
4. How do you know that baking a cake involves chemical changes?
5. List some signs or clues that show that a change you are observing is a chemical change.
6. Because ______________________ change the identity of the substances involved, they are hard to reverse.
7. How could some chemical changes be reversed? Give and example.
8. During _______ , the composition of a substance does not change.
Identify wheter the following changes are physical changes or chemical changes.
9. Mising vinegar and baking soda
10. Grinding baking soda into a powder.
11. Souring MilkHelp With My Science Homework?
1. once you burn wood, you can't un-burn it
2. properties of matter
3. properties of matter
4. can you un-cook it?
5. it is much more difficult (often impossible) to undo a chemical change
7. Na2CO3 + CaCl2鈫?2NaCl + CaCO3
2NaCl + CaCO3 鈫?Na2CO3 + CaCl2
8. physical change
9. chemical
10. physical
11. chemical
12. physical
13. chemical
14. chemical
15. physical
16. physical
