Your answer is B(I'm not very much sure about this one), C, and D.
I hope very much that I am correct, hope this helps you.
~Onyx~
Answer:
I think it's a or c let me look at it one more time hold on!!
Answer:
Explanation:
Physical Change:
The changes that occur only due to change in shape or form but their chemical or internal composition remain unchanged.
These changes were reversible.
They have same chemical property.
These changes can be observed with naked eye.
Example
:
Water converting to Ice
Water converting to gas
In this water molecule remain the same only they rearrange themselves that change its state of mater not composition
Chemical changes:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
These changes are irreversible
These changes occur due to chemical reactions
These may not be observed with naked eye
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO₂ and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg
The reaction of Hydrogen and oxygen:
H₂ (g) + O₂ (g) -------------------------------------> 2H₂O (l)
Zero, the Krebs Cycle converts them all to CO2 which is released.
Answer:
It is important because it separates the area that the process is happening from its surroundings, and it's easy to measure and make observations by doing that.
Explanation:
The system is the part of the universe that is separated for study. It has a frontier, which is the limitation of it, and the external area is the surroundings.
In the system the chemical and physical process is happening: reactions are taking place, gas is expanding, heat is being absorbed or lost, etc.
So, to understand the process that is happening, it's necessary to define the system under study because the measurements, analyze, and observation will be easily done.
