Answer:
C they are moving away from each other
Explanation:
Answer:
E
Explanation:
The question talks of a PHYSICAL model of the sun. An equation, chart, computer program and paragraph are most definitely not physical models.
Answer:
When bonds are formed energy is released.
When bonds are broken energy is required or absorbed.
Explanation:
The energy changes occur during the bonds formation and bonds breaking.
There ere two types of reaction endothermic and exothermic reaction.
Endothermic reactions:
In this type of reaction energy needed to break the bond are higher than the energy released during bond formation.
For example:
C + H₂O → CO + H₂
ΔH = +131 kj/mol
it can be written as,
C + H₂O + 131 kj/mol → CO + H₂
Exothermic reaction:
In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.
For example:
Chemical equation:
C + O₂ → CO₂
ΔH = -393 Kj/mol
it can be written as,
C + O₂ → CO₂ + 393 Kj/mol
Ice melting is a physical change because you are not getting rid of anything, it is simply transforming into another state. The ice is melting because it is heating up and causing the molecules to speed up ans spread out, meaning all of the ice`s properties are still there, just in a different form.
Answer:
A. Physical Change
Answer:
1.8 cm according to the given data.
Explanation: