Answer:
Density of the solid=
Explanation:
We are given that
Mass of sample of metal=4.369 g
Volume in the flask, V=126.4 ml
Mass of water, flask, and metal=268.5 g
Mass of flask=139.3 g
Density of water=1.000 g/mL
We have to find the density of the solid.
Mass of water=268.5-4.369-139.3=124.831 g
Volume of water=
Volume of water=
Volume of solid=126.4 ml-124.831 mL
=1.569mL
Now,
Density of the solid=
=
1mL=1 cubic cm
Therefore,
Density of the solid=
It shows that gold (all) atoms are made of mostly empty space. The alpha particles go right through because they hit nothing in the atoms which showed Rutherford that atoms are mostly empty space.
The notation is actually written in this way (shown in the attached picture). The X is the symbol of the element. So, for potassium, the symbol is K. The A represents the mass number of the isotope. In this case, that would be equal to 39. The Z represents the atomic number of potassium, which is 19. Therefore, the symbol for the isotope is:
³⁹₁₉K
Answer:
Explanation:
We are given that
Diffusion coefficient,
Thickness of membrane,
Area,
Concentration differences,
We have to find the flow rate of sodium ions.
Flow rate,
Using the formula
The answer is C because it's the only that pertains to climate change. The other answers are more about local economy.