Answer:
Explanation:
So chemical changes require a change on a molecular level that cannot be reversed because they form some new substance. Souring milk is not something you can reverse, and the process of it souring produces new molecules.
Answer:
C.Hydrogen
Explanation:
The hydrogen atom contains 1 proton and 1 electron, but no neutrons.
Answer : The O-O bond in
will be longer than the O-O bond in
.
Explanation :
In the
, the two oxygen atoms are bonded by the single bond and in
, the two oxygen atoms are bonded by the double bond.
As we know, the bond strength of double bond is greater than the single bond.
And the relation between the bond strength and bond length is,

That means the higher the strength, the shorter will be the bond length.
Hence, the bond length of single bond will be longer than the double bond.
The structure of given molecule is shown below.
8miles in 2 hours. Let's find how many she did on average in one hour.
8/2 = 4miles per hour.