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sweet-ann [11.9K]
3 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]3 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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Elena held a rock weighing 1 N in her hand. The rock has no velocity. <br> KE________?
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KE = 0

<h3>Further explanation  </h3>

Energy is the ability to do work  

Energy because its motion is expressed as Kinetic energy (KE) which can be formulated as:  

\large{\boxed{\bold{KE=\frac{1}{2}mv^2}}}

So for two objects that have the same speed, the greater the mass of the object, the greater the kinetic energy  

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Answer the following question attached!!
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A sample of an unknown gas takes 371 s to diffuse through a porous plug at a given temperature.
blsea [12.9K]

Answer:

125.84 g/mol is the molar mass of the unknown gas.

Explanation:

Let the volume of the gases effusing out be V.

Effusion rate of the unknown gas = R=\frac{V}{371 s}

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Molar mass of unknown gas = m

Mass of nitrogen gas = 28 g/mol

Graham's law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:

\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}

\frac{R}{r}=\sqrt{\frac{28 g/mol}{M}}

\frac{\frac{V}{371 s}}{\frac{V}{175s}}=\sqrt{\frac{28 g/mol}{M}}

\frac{175 s}{371 s}=\sqrt{\frac{28 g/mol}{M}}

M=\frac{28 g/mol\times 371\times 371}{175\times 175}=125.84 g/mol

125.84 g/mol is the molar mass of the unknown gas.

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