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3 years ago

List two disadvantages of using synthetic dyes

Chemistry

2 answers:

balu736 [363]3 years ago

6 0

• Synthetic fibres are nonbiodegradable .

• Synthetic fibres melt and burn easily.

exis [7]3 years ago

3 0

Synthetic Dyes have mercury, lead, chromium and more chemicals. Exposure to this can be toxic and have severe effects on the human body!

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• 1. An object has a mass of 570g and a volume of 2280ml. Calculate its<br> density. 250 kg/m3

Dima020 [189]

Answer:

Density=mass/volume

= 570/2280

=0.25g/ml

7 0

3 years ago

What mineral mostly form through chemical precipitation?

zzz [600]

The mineral that is found is Sedimentary Rocks

5 0

3 years ago

The ideal gas heat capacity of nitrogen varies with temperature. It is given by:

hammer [34]

Answer:

A) 1059 J/mol

B) 17,920 J/mol

Explanation:

Given that:

Cp = 29.42 - (2.170*10^-3 ) T + (0.0582*10^-5 ) T2 + (1.305*10^-8 ) T3 – (0.823*10^-11) T4

R (constant) = 8.314

We know that:

$C_p=C_v+R$

We can determine $C_v$ from above if we make $C_v$ the subject of the formula as:

$C_v$ $=C_p-R$

$C_V = 29.42-(2.7*10^{-3})T+(5.82*10^{-7})T2-(1.305*10^{-8})T3-(8.23*10^{-12})T4-8.314$

$C_V = 21.106-(2.7*10^{-3})T+(5.82*10^{-7})T2-(1.305*10^{-8})T3-(8.23*10^{-12})T4$

A).

The formula for calculating change in internal energy is given as:

$dU=C_vdT$

If we integrate above data into the equation; it implies that:

$U2-U1=\int\limits^{500}_{450}(21.106-(2.7*10^{-3})T+(5.82*10^{-7})T2-(1.305*10^{-8})T3-(8.23*10^{-12})T4\,) du$

$U2-U1=\int\limits^{500}_{450}(21.106-(2.7*10^{-3})T/1+(5.82*10^{-7})T2/2-(1.305*10^{-8})T3/3-(8.23*10^{-12})T4/4\,)$

$U2-U1= 1059J/mol$

Hence, the internal energy that must be added to nitrogen in order to increase its temperature from 450 to 500 K = 1059 J/mol.

B).

If we repeat part A for an initial temperature of 273 K and final temperature of 1073 K.

then T = 273 K & T2 = 1073 K

∴

$U2-U1=\int\limits^{500}_{450}(21.106-(2.7*10^{-3})T/1+(5.82*10^{-7})T2/2-(1.305*10^{-8})T3/3-(8.23*10^{-12})T4/4\,)$

$U2-U1=\int\limits^{500}_{450}(21.106-(2.7*10^{-3})273/1+(5.82*10^{-7})1073/2-(1.305*10^{-8})T3/3-(8.23*10^{-12})T4/4\,)$

$U2-U1= 17,920 J/mol$

3 0

3 years ago

Classify the following as an element, compound, homogeneous mixture, or heterogeneous

Archy [21]

The answer is D. Heterogeneous mixture

3 0

3 years ago

Is anyone online 2 help,Sodium is a reactive metal.Why nd don't spam brainlest and thx is waiting answer it ❤️

morpeh [17]

It is because sodium is one of the most reactive metals.

There is a reaction would take place between magnesium and sodium chloride.

The chemical reaction between these two metals is given below.

It is Mg + 2NaCl >> MgCl2. + 2Na.

The symbol of this chemical element is Na.

It has the atomic number of eleven

Hope this helps *smiles*

6 0

3 years ago

List two disadvantages of using synthetic dyes​

List two disadvantages of using synthetic dyes