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JulsSmile [24]
3 years ago
13

Why must the line of origin be drawn in pencil instead of pen on the chromatography strip?

Chemistry
1 answer:
Kruka [31]3 years ago
5 0

Answer:

Because if you use pen, your chromatography will separate also the colors of the pen and not just your sample.

Explanation:

The pencil since is carbon as simple element, is solid and is not dissolved in solvents like commonly are used in paper chromatography, it will not interrupt the separation of the compounds in your mixture, otherwise, your results will be confuse because you are not sure if the spots that you observe is due to the ink pen or due to the mixture that you want to separate.

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What is the resistance of a 150 W lightbulb connected to a 24 V voltage source?
Luda [366]

Answer:

3.84 Ω

Explanation:

From the question given above, the following data were obtained:

Electrical power (P) = 150 W

Voltage (V) = 24 V

Resistance (R) =?

P = IV

Recall:

V = IR

Divide both side by R

I = V/R

P = V/R × V

P = V² / R

Where:

P => Electrical power

V => Voltage

I => Current

R => Resistance

With the above formula (i.e P = V²/R), we can calculate resistance as illustrated below:

Electrical power (P) = 150 W

Voltage (V) = 24 V

Resistance (R) =?

P = V²/R

150 = 24² / R

150 = 576 / R

Cross multiply

150 × R = 576

Divide both side by 150

R = 576 / 150

R = 3.84 Ω

Thus, the resistance is 3.84 Ω

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3 years ago
Destruction of mountains can lead to what
Zina [86]

Answer:

liquid magma

Explanation:

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3 years ago
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wlad13 [49]

Answer:

It is true answer. Ozone = O3

7 0
3 years ago
Which mixtures could be separated using filtration? Check all that apply.
cestrela7 [59]

Answer:

smoky air

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Explanation:

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The formulas for elements never contain a subscript true or not true
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