Answer:
A is a physical change due to a change of state, but B is a chemical change because new molecules are formed.
Explanation:
Physical Change
The changes that occur only due to change in shape or physical properties 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 vapors condenses.
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 change:
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 decomposition of water into Hydrogen and oxygen:
2H₂O → 2H₂ + O₂
Answer: C. A is a physical change due to a change of state, but B is a chemical change because new molecules are formed.
Which statement is true about the two changes?
A. Both are chemical changes because new substances are formed.
B. Both are physical changes because only the physical state of the substances change.
C. A is a physical change due to a change of state, but B is a chemical change because new molecules are formed.
D. A is a chemical change due to a change of state, but B is a physical change because new molecules are formed.
Explanation:
I just took the test and the correct answer is C.!
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