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:
5.119 *10^25
Explanation:
1 mole = 6.022 * 10^23

the moles cancel out so you get
85 * (6.022*10^23)
Plug that into the calculator so you get:
5.119 *10^25
There can be three definitions of a base: Arrhenius base, Lewis base or Bronsted-Lowry base. Isoquinoline acts specifically as a Bronsted-Lowry base, which is a proton acceptor. Also, it acts as an Arrhenius base because it produces OH- ions after the reaction. The net ionic equation is:
<span><em>C</em></span><em>₉</em><span><em>H</em></span><em>₇</em><span><em>N (aq) + H</em></span><em>₂</em><span><em>O ---> C</em></span><em>₉</em><span><em>H</em></span><em>₇</em><span><em>NH</em></span><em>⁺</em><span><em> (aq) + OH</em></span><em>⁻</em><span><em> (aq)</em></span>
Where's the amount of oxygen? You need oxygen and iron to make FeO
Answer:
He realized that an element is defined by its number of protons. ... When Moseley arranged the elements in the periodic table by their number of protons rather than their atomic weights, the flaws in the periodic table that had been making scientists uncomfortable for decades simply disappeared.
Explanation:
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