ScienCe HELP pleasE...?

Question

1.What is the type of matter change where you cannot determine original substances, and new substances are formed?

2.What is the type of matter change in which matter stays the same and no new substances are formed?

3.What is anything that takes up space and has mass?

4.What is the type of chemical reaction in which heat is absorbed?

5.What is the type of chemical reaction in which heat is given off?

Answer 1

1) combustion

2) any physical change like melting, boiling, freezing

3) matter

4) Endothermic reactions ∆H > 0

5) Exothermic reactions ∆H < 0

Answer 2

1. in case , where milk changes into curds. here curds cannot be recovered as milk. it is irreversible reaction.
2. when ice melts, it changes into water. Here there is no change of matter but there is change of state of matter.
3. Matter such as chair, table etc take space to occupy and has mass.
4. in anomolous expansion of water, when salt is added to it, heat energy is absorbed from water n ice melts.
5. when hydrogen gas n oxygen are cmbined to give water, heat is given off.

Answer 3

Victoria,

It would be easier if you looked in the book. People on YA will give you wrong answers just to make you look like a retard

Answer 4

4. ENDOTHERMIC

5. EXOTHERMIC

Answer 5

not sure