Gold has a density of 19.32 is this a chemical change or physical change
1 answer:
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Answer:
Zinc metal might be mixed with the copper.
Explanation:
Density is defined as mass of the substance present in the unit volume of the substance.
Density of pure copper = d = 8.94 g/mL =
Mass of the copper penny = M = 2.49 g
Volume of the copper penny = V =
Density of the copper penny = d
Density of pure copper > Density of zinc > Density of penny
The metal mixed with copper is zinc to make a penny . This is so because all the other metal given have higher value of density which will increase the density of the copper penny if they were present.
But here the density of the copper penny is smaller than density of pure copper which means that less denser metal than copper is also added in the penny.
Answer:
The for
formation is
.
Explanation:
Concentration of ferric ion =
Volume of ferric solution = 3.0 mL = 0.003 L
Moles of ferric ion
1 mL = 0.001 L
Concentration of ion =
Volume of ion solution = 3.0 mL = 0.003 L
Moles of ion=
Volume of nitric acid solution = 10 mL = 0.010 L
After mixing all the solution the concentration of ferric ion and ion will change
Total volume of solution = 0.003 L + 0.003 L + 0.010 L = 0.016 L
Initial concentration of ferric ion before reaching equilibrium :
=
Initial concentration of ion before reaching equilibrium :
=
Initially:
0.00375 M 0.000375 M 0
At equilibrium :
(0.00375-x) (0.000375-x) x
Equilibrium concentration of
The expression of equilibrium constant for formation is given by :
The for
formation is
.