Answer:
01.02 × 10⁻³g has 3 significant figures.
Explanation:
01.02 × 10⁻³g has 3 significant figures because all non-zero figures are significant, all zeros in between numbers are significant, and all zeros before or after (unless there is a decimal point before) are not significant.
Answer:
The change of state of wax from solid to liquid and liquid to vapors is a physical change.
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.
Chemical:
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
When a candle is burned, the both physical and chemical changes occur.
The solid wax is melted into the liquid and than liquid is evaporated into vapor form. It is a physical change because just the state of mater is changed. When vapors of wax are react with oxygen in air and form carbon dioxide and ash it is a chemical change which can not be reversed.
There are 3500 ms in 3.5 s
Evolution is defined as change in gene frequency
