4 years ago

Differentiate between the various qualities of reagents which are ordinary ,analar and industrial quality reagent

1 answer:

4 0

The difference between ordinary, analar and industrial reagents is the in the purity. Ordinary reagents are those whose purity meets the standard. Analar reagents are used in chemical analysis and they are of high purity but with known contaminants which again illustrates their use in chemical analyses.Finally the industrial reagents are not pure enough and they are used for industrial purposes as well for commercial use.

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A new penny has a mass of 2.49 grams and occupies 0.349 cm cubed. If pure copper has a density of 8.96 g/cm cubed, is the new pe

lys-0071 [83]

Answer: The new penny is not pure copper

Explanation:

Density $\rho$ is defined as a relation between the mass $m$ and the volume $V$ :

$\rho=\frac{m}{V}$

Now, we are told the density of pure copper is:

$\rho_{copper}=8.96 g/cm^{3}$

And we are given the mass and volume of the new penny, with which we can calculate its density:

$\rho_{penny}=\frac{m_{penny}}{V_{penny}}=\frac{2.49 g}{0.349 cm^{3}}$

$\rho_{penny}=7.13 g/cm^{3}$ As we can see the density of this penny is not equal to the density of pure copper, hence the new penny is not pure copper.