Single displacement and combustion reactions are ALWAYS redox.
Answer:
4 moles of Na are needed.
I think D, not sure though!
Answer:
Explanation:
Mass percent is defined as the mass of an element divided by the sum of masses of all the elements multiplied by 100. It is generally used to define the concentration. It does not depend on concentration.
It is given as;
Mass percent = (mass of an element / Total mass of the compound ) × 100
Mass of compound (alloy) = 78.2 g copper + 103.5 g zinc +2.8 g lead = 184.5 g
(a) Cu
Mass of Cu = 78.2
Mass percent = (78.2 / 184.5) * 100 = 42.38%
(a) Zn
Mass of Zn = 103.5
Mass percent = (103.5 / 184.5) * 100 = 56.10%
(c) Pb
Mass of Pb = 2.8
Mass percent = (2.8 / 184.5) * 100 = 1.52%
OK so some examples of a colloid would be whipped cream, milk, butter, colored glass, muddy water things like that
