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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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a 125g bar of aluminum at 22 degrees celsius. determine the final temperature of the aluminum, if the amount of energy applied i

____ [38]

Answer : The final temperature of the aluminum is, $155.9^oC$

Explanation :

Formula used :

$q=m\times c\times (T_{final}-T_{initial})$

where,

q = heat = 3600 cal = 15062.4 J (1 cal = 4.184 J)

m = mass of aluminum = 125 g

c = specific heat of aluminum = $0.90J/g^oC$

$T_{final}$ = final temperature = ?

$T_{initial}$ = initial temperature = $22^oC$

Now put all the given values in the above formula, we get:

$15062.4J=125g\times 0.90J/g^oC\times (T_{final}-22)^oC$

$T_{final}=155.9^oC$

Thus, the final temperature of the aluminum is, $155.9^oC$

7 0

3 years ago

A tank containing both HF and HBr gases developed a leak. The ratio of the rate of effusion of HF to the rate of effusion of HBr

exis [7]

Answer:

E. 0.497

Explanation:

Graham's law of diffusion or effusion states that the rate of diffusion or effusion is inversely proportional to the square root of the molecular mass.

k=r√m

1=HF, 2=HBr

Molar mass of HF=20. Molar mass of HBr=80.91

r1√20=r2√80.91

r1/r2=4.472/8.994

r1/r2=0.497

r1√m1=r2√m2

4 0

3 years ago

Read 2 more answers

Discuss a use for evaporation.

Anton [14]

1. Rain which is good for agriculture. 2. When one is sweating, the sweat evaporates and cools one down. Please mark as brainliest answer.

8 0

3 years ago

The combustion of toluene has a δerxn of −3.91 × 103kj/mol. when 1.55 g of toluene (c7h8) undergoes combustion in a bomb calorim

maw [93]

Answer: The heat capacity of the bomb calorimeter is $2.84 kJ/g^oC$ .

Explanation:

$\Delta H_{reaction}=-3.91\times 10^3 kJ/mol=-3.91\times 10^6 J/mol(1kJ=1000J)$

Given mass of toluene = 1.55 g

Number of moles of Toluene:

$=\frac{\text{Given mass of toluene}}{\text{Molecular mass of toluene}}=\frac{1.55}{92.14 g/mol}=0.0168 moles$

Energy required by 0.0168 moles of toluene= $\Delta H_{reaction}\times 0.0168 moles=-3.91\times 10^6 J/mol\times 0.0168 mol=-0.065688\times 10^6 J$

Since heat released on combustion of 0.0168 moles toluene, this heat will get absorbed by the bomb calorimeter ,then (Q) will be:

$Q=0.065688\times 10^6 J$

$\Delta T= 37.92^oC-23.02^oC=14.9^oC$

$Q=mc\Delta T=0.065688\times 10^6 J=1.55 g\times c \times (14.9^oC)$

$c=2.84\times 10^3 J/g^oC=2.84 kJ/g^oC$

The heat capacity of the bomb calorimeter is $2.84 kJ/g^oC$ .

8 0

3 years ago

Why radicals are highly reactive?

kvasek [131]

Explanation:

Radicals are so reactive because they require so much energy to form.

7 0

3 years ago

List two disadvantages of using synthetic dyes​

List two disadvantages of using synthetic dyes