In the nucleus there are two main subatomic particles: The protons and the neutrons. The number of protons in the nucleus determines the element the atom is: 1 proton = hydrogen , 99 protons = Einsteinium , 6 protons = carbon etc.
The number of neutrons in the nucleus varies from atom to atom, even atoms of the same element. This causes the mass of the nucleus to vary slightly and can effect properties such as stability or type of nuclear decay. Atoms of the same element with different masses are called isotopes. They differ by the number of neutrons with the proton in te nucleus:
1 proton + 0 neutrons = 1 particle in the nucleus = hydrogen
1 proton + 1 neutron = 2 particles in the nucleus = deuterium
1 proton + 2 neutrons = 3 particles in the nucleus = tritium
Hope this helps
pOH = -log(OH^(-)] = -log[9.50 × 10^(-9)] = 8.02
I believe the statement given above is true. When solid mercury (ii) nitrate is being heated, a decomposition reaction happens. The solid would decompose into 3 different substances - solid mercury (ii) oxide, gaseous nitrogen dioxide, and oxygen. The balanced chemical reaction would be written as:
2Hg(NO3)2 = 2HgO + 4NO2 +O2
<span>Decomposition reaction is a type of reaction
where it involves a single compound breaking down into two or more products.
These reactions often requires an energy source thus it is an endothermic
reaction. This is evident for this reaction since we supplied heat to the reactant for the reaction to proceed.</span>
Answer:
491.4 g
Explanation:
This a stoichiometry question, let me repeat the reaction equation here;
2 Na + Cl2 --> 2 NaCl
The balanced reaction equation must serve as a guide in solving any problem on stoichiometry.
From the balanced reaction equation;
1 mole of chlorine gas yields 2 moles of sodium chloride
Therefore, 4.2 moles of chlorine gas yields 4.2 ×2/1 = 8.4 moles of sodium chloride.
Molar mass of sodium chloride= 23 + 35.5= 58.5 gmol-1
Mass of sodium chloride formed= number of moles × molar mass
Mass of sodium chloride formed= 8.4 × 58.5= 491.4 g