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 :)
The answer to this item is TRUE. This can be explained through the Graham's law. This law states that the rate at which gases diffuse is inversely proportional to the square root of their densities which is also related to their molecular masses.
The law for universal gravitation is
F=G(m1m2/d^2)
Answer:
2HNO3 + Ca(OH)2 → 2H2O + Ca(NO3)2
Explanation:
HNO3 + Ca(OH)2 → ?
This is an acid-base reaction. It is also a double displacement reaction, in which the positive ions change partners.
Thus, H pairs with OH and Ca pairs with NO3.
HNO3 + Ca(OH)2 → HOH + Ca(NO3)2
HOH is our old friend, H2O (water) so, after balancing atoms, the equation becomes:
2HNO3 + Ca(OH)2 → 2H2O + Ca(NO3)2