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ArbitrLikvidat [17]
3 years ago
6

State evidence from the bright-line spectra that indicates element A is not present in

Chemistry
1 answer:
Schach [20]3 years ago
4 0
After studying the graph,the evidence from the bright line spectra that indicates element A is not present in the mixture is 11 the lines of A are not present in the mixture 700 nm is missing. 
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Copper was the first metal to be produced from its ore because it is the easiest to smelt, that is, to refine by heating in the
Ganezh [65]

Answer:

57.48%

Explanation:

Calculate the mass of 1 mole of malachite:

MM Cu = 63.55

MM O = 16.00

MM H = 1.01

MM C = 12.01

(Cu_{2}(OH)_{2}CO_{3})

A mole of malachite has:

2 moles of Cu

5 moles of O

2 moles of H

1 mole of C

MW Malachite = 2*MM(CU) + 5*MM(O) + 2*MM(H) + 1 *MM(C)

MW Malachite = 2*63.55 + 5*16.00 + 2*1.01 + 1*12.01

MW Malachite = 221.13

Mass of Cu in a mole of Malachite = 2*MM(CU) = 127.1

Now divide the mass of Cu by the mass of Malachite

%Cu = \frac{127.1}{221.13} =0.5748=57.48%

7 0
4 years ago
what are the reactants in the first word equation above. magnesium+hydrochloric acid ⇒ magnesium chloride + hydrogen
Alex

Answer:

magnesium+ hydrochloric acid is the reactants

Explanation:

the reactants are always in the left and the products are always in the right by

magnesium+hydrochloric acid ⇒ magnesium chloride + hydrogen

by combining magnesium and hydrochloric acid it produces magnesium chloride and hydrogen.

hope this helps..

6 0
3 years ago
How many moles of water are contained in 0.250 mol of cuso4 5h2o?
Mamont248 [21]
1 mol CuSO₄·5H₂O ----------- 5 mol H₂O
0,25 mol CuSO₄·5H₂O ---- Xmol H₂O
X = 5×0,25 = 1,25 mol H₂O
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3 years ago
As gaseous material condensed in the solar nebula, ice formed
Pachacha [2.7K]
Only far from the Sun material condensed in the solar nebula, ice formed
8 0
4 years ago
Determine what product will be produced at the negative electrode for the
inna [77]
D koh because it is
4 0
3 years ago
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