Answer:
Sun light comes from the sun which is a part of our solar system
and it look different because the earth is spinning so the angle will can and that will determine if the sun rays will get light or darker
Answer:
It is called Ionization Energy.
Answer:
2 option
Explanation:
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- it breaks down food into tiny pieces.
- There is heat in our stomach to help the stomach break food into tiny pieces.
- The waste goes down and the fat is kept as energy and the stomach keeps the nutrition.
a) The complete balanced
chemical equation is:
Zn(s) + H2SO4(aq)
--------> ZnSO4(aq) + H2 (g)
<span>b) First we find the amount zinc that has reacted based
on the given H2 produced.</span>
From stoichiometry 1 moles
of Zn is needed for every 1 moles of H2 produced, therefore:
moles(Zn) = moles(H2)
where moles is the ratio
of mass and molar mass (MM)
mass(Zn) / MM(Zn) = mass(H2) / MM(H2)
mass(Zn) = [mass(H2) / MM(H2)] * MM(Zn)
mass(Zn) = [(0.0764 g)/(2 g/mol)] * 65.38 g/mol
mass(Zn) = 2.49 g
So we got 2.49 g pure zinc in the sample so
the purity of zinc is therefore:
purity = (2.49 / 3.86) * 100 % = 64.50 %
<span>c) In part (b) what we need to assume is that in the
impurities in the sample do not react with sulfuric acid to produce hydrogen.
So that the hydrogen is only from the reaction of Zn and sulphuric acid.</span>
