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lozanna [386]
3 years ago
8

What happens when the silvered coin is put on the flame

Chemistry
1 answer:
exis [7]3 years ago
4 0

Answer:

On heating the coin in the Bunsen flame, brass is formed by the zinc migrating into the surface layer of the copper. This gives a gold appearance to the coin. Brass is an alloy of copper containing between 18% and 40% of zinc.

Explanation:

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You have a 1.153 g sample of an unknown solid acid, HA, dissolved in enough water to make 20.00 mL of solution. HA reacts with K
Shalnov [3]

Answer:

The concentration of the unknown acid (HA) is 0.434M

The molar mass of HA is 13.3g/mole

Explanation:

DETERMINATION OF MOLARITY OF THE UNKNOWN ACID

CaVa/CbVb = Na/Nb

From the equation of reaction and at equivalence point, Na = Nb = 1

Therefore, CaVa = CbVb

Va (volume of acid solution) = 20mL = 20/1000 = 0.2L

Cb (concentration of KOH) = 0.715M

Vb (volume of KOH) = 12.15mL

Ca (concentration of acid) = CbVb/Va

Ca = 0.715M × 12.15mL/20mL = 0.434M

DETERMINATION OF MOLAR MASS OF HA

Number of moles of acid = concentration of acid × volume of acid solution in liters = 0.434 × 0.2 = 0.0868mole

Molar mass of HA = mass/number of moles = 1.153g/0.0868mole = 13.3g/mole

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4 years ago
A topographical map of a section of Charleston, SC is shown. What feature is located at the dot marked with an X? A) the center
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How does a community look after a volcano erupts
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The ___ vapor pressure at high altitudes causes a liquid to boil at a ____ temperature.
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The _HIGHER__ vapor pressure at high altitudes causes a liquid to boil at a _LOWER___ temperature.

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