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love history [14]
3 years ago
11

PLEASE HELPP Tell me everything you know about "balancing the equation" for science

Chemistry
1 answer:
Free_Kalibri [48]3 years ago
3 0
Watch melissa maribel explains it amazingly on her yt channel
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I need help completing this flowchart on separating a mixture of sand, sodium chloride, and acetanilide
kolezko [41]

The key to most "how do I separate." questions is solubility.

The trick is to add a liquid that will only dissolve one substance but not another.

Let's say you had a beaker full of sand, table salt (NaCl), and acetanilide. Is there anything you can add that would only dissolve one of these three substances?

Yes, there is! Acetanilide like most organic compounds, isn't soluble in water. But salt is soluble in water. So to the mixture, I would add water, and then pass the water through a filter. The filter paper will "catch" the sand and acetanilide, but the table salt will remain dissolved in the water. If you then let that water evaporate (either via boiling or under vacuum), you will recover your salt.

So now, how to do you separate the sand from the acetanilide? Sand isn't really soluble in anything, but acetanilide is soluble in organic solvents, such as ethanol. So to the mixture of sand and acetanilide, add ethanol, and pass it through a filter. The sand will once again get stuck in the filter paper, and your acetanilide will be dissolved in ethanol. Remove the ethanol (via vacuum, or rotovap) and you will be left with acetanilide.

6 0
3 years ago
If 18.0 g of CO2 is produced in the reaction of C2H2 with O2 to form CO2 and
Tanya [424]

Answer:

3.68 g

Explanation:

n_{CO2} = 18 ÷ 44 = 0.4

2C2H2 + 5O2 → 4CO2 + 2H2O

   2       :    5      :    4      :    2  

                             0.409                 (moles)

⇒ n_{H2O} = 0.409 × 2 ÷ 4 = 0.2045 moles

⇒ m_{H2O} = 0.2045 × 18 = 3.68 grams

5 0
3 years ago
Which of the following is the most reasonable explanation for a drop in temperature of gas?
ozzi

Answer: The correct answer is option B.

Explanation:

Average kinetic energy of the gas molecule is given by relation:

E_K=\frac{3}{2}\frac{R}{N_A}\times T

N_A = Avogadro Number

T = Temperature of the gas in Kelvins.

R = Universal gas constant

E_K\propto T

With increase in temperature the kinetic energy of the gas molecule increases and vice-versa.

So, according to the question the explanation for a drop in temperature of the gas is decrease in average kinetic energy of the gas molecules.

Hence, the correct answer is option B.

3 0
3 years ago
Read 2 more answers
What kind of wave can humans see
Sidana [21]

The human retina can only detect incident light that falls in waves 400 to 720 nanometers long, so we can't see microwave or ultraviolet wavelengths. This also applies to infrared lights which has wavelengths longer than visible and shorter than microwaves, thus it is invisible to the human eye.

3 0
3 years ago
How many moles are in 2.34 × 1023 F atoms?<br> Answer in units of mol.
exis [7]
No there is no moles
4 0
3 years ago
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