Answer:
Explanation:
<em>Compounds</em> are pure substances formed by two or more different kind of atoms.
For example, H₂O, and CaCO₃ are compounds.
- H₂O can be separated into hydrogen (H₂) and oxygen (O₂) only by a chemical change.
- CaCO₃ can be separated into CaO and CO₂ only by a chemical change.
Elements can not be separated into other substances by a chemical change. The process to change an element into other substance (different element) is a nuclear reaction (transmutation).
Mixtures are not pure substances and can be separated into other substances by physical changes: for example, a brine can be separated into salt and water by evaporation.
The difference of the blood
Explanation:
i think it is exothermic processes
In the Early 1800s, John Dalton stated that matter is tiny particles called atoms that are indivisible. Some materials were only made of one kind of atom called an element. Two atoms of hydrogen combined with one atom of oxygen would form one molecule of water.
Then, in 1897, J.J Thompson proposed that repetitively charged particles inside of the atom were part of every atom. And those were called electrons. They called Thomson's work "Plum Pudding." Sadly, "Plum Pudding" didn't last very long.
Rutherford concluded there was a center of a positive charge within the atom called protons. Atoms contained one proton for each electron.
P.rotons- Positively electric charged
E.lectrons- Negative electricity
N.eutrons- about the same mass as a proton, but with no electric charge.
P.E.N
I hoped this helped :)