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sweet-ann [11.9K]
2 years ago
7

Determine the method to separate a mixture of ground glass and salt in order to have a pile of ground glass and another pile of

salt.
write a step by step procedure that would accomplish this task. note any safety concerns in your procedures
Chemistry
1 answer:
Serga [27]2 years ago
3 0
1 Water is added to the mixture of ground glass and salt to dissolve the salt content

2 The mixture is then filtered leaving the grounded glass particles in the sieve

3 The salt is then evaporated leaving the salt crystals
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A gas with a volume of 250 mL at a temperature of 293K is heated to 324K. What is the new volume of the gas?
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Answer:

The new volume of the gas is 276.45 mL.

Explanation:

Charles's law indicates that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases, and as the temperature decreases, the volume of the gas decreases.

Charles's law is a law that mathematically says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:

\frac{V}{T} =k

Analyzing an initial state 1 and a final state 2, it is satisfied:

\frac{V1}{T1} =\frac{V2}{T2}

In this case:

  • V1= 250 mL
  • T1= 293 K
  • V2= ?
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Replacing:

\frac{250 mL}{293 K} =\frac{V2}{324 K}

Solving:

V2=324 K*\frac{250 mL}{293 K}

V2= 276.45 mL

<em><u>The new volume of the gas is 276.45 mL.</u></em>

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How many grams of nickel (+2) are required to replace all of the silver when 15.55 grams of AgNO3 are present?
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2AgNO3 + Ni2+  = Ni(NO3)2 + 2Ag<span>+</span>

From the reaction, it can be seen that AgNO3 and Ni2+ has following amount of substance relationshep:

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From the relationshep we can determinate requred moles of Ni2+:

n(AgNO3)=m/M= 15.5/169.87=0.09 moles

So, n (Ni)=n(AgNO3)/2=0.045 moles

Finaly needed mass of Ni2+ is:

m(Ni2+)=nxM=0,045x58.7=2.64g

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Explanation:

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