Answer:
Option D
Explanation:
Rutherford deduced that the atomic nucleus was positively charged because the alpha particles that he fired at the metal foils were positively charged, and like charges repel. Alpha particles consist of two protons and two neutrons, so they are positively charged. In Rutherford's experiments most of the alpha particles passed straight through the foil without being deflected. However, occasionally the alpha particles were deflected in their paths, and rarely the alpha particles were deflected backward at a 180 degree angle.
Since like charges repel, Rutherford concluded that the cause of the deflections of the positively charged alpha particles had to be something within the atom that was also positively charged. Rutherford concluded from his metal foil experiments that most of an atom is empty space with a tiny, dense, positively charged nucleus at the center that contains most of the mass of the atom.
To find average atomic mass, multiply each isotope's atomic mass with its relative abundance and add it all up.
15.012*0.1423 + 16.988*0.3348 + 19.177*0.5229 = 17.851 (5 s.f.)
Reactivity of metals depends on the tendency to lose electrons. ... As we move down the group, the tendency to gain electrons decreases because as the atomic size increases, the effective nuclear charge decreases.
Answer:
The hydronium ion concentration of the substance is 0,01 M.
Explanation:
The pH indicates the acidity or basicity of a substance. PH values between 0 and less than 7 indicate acidic solutions, 7 neutral and greater than 7 to 14 basic. It is calculated as
pH = -log (H 30+), and in this case we solve to calculate (H30 +):
(H30 +) = antilog -pH= antilog -2
<em>(H30+)=0,01 M</em>
Hey there :)
The highest solubility of a solute will be when it has the greatest quantity in g when dissolved in 100 g of water. So the solute that is most soluble in water, will have a higher g/100 g water.
1:
a: 0°C - Sucrose will be the solute that is most soluble in water.
b: 80 °C - Also Sucrose will be the most soluble in water.
2:
Yes, as we can see in the graph, sucrose, potassium nitrate, ammonium sulfate and sodium chloride have different solubilities between them and at different temperatures. For example, solubility at 0 °C:
sucrose: 180 g / 100 g of water
potassium nitrate: ~10 g/ 100 g of water
ammonium sulfate: 80 g/100 g water
sodium chloride: 30 g/ 100 g of water
