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son4ous [18]
2 years ago
14

Explain briefly how you would obtain crystals of sodium chloride from a mixture of sodium chloride ,lead[ii]oxide and iron filin

gs
Chemistry
1 answer:
Arisa [49]2 years ago
6 0

Answer:

See explanation

Explanation:

All the substances in the mixture; sodium chloride ,lead II oxide and iron filings are solids.

The first step is to use a magnet to separate the iron fillings which is a magnetizable material.

The remaining part of the mixture is now dissolved in water. Lead II oxide is insoluble in water while sodium chloride is very soluble in water hence a filtrate and a residue are obtained.

The residue is lead II oxide which can be dried to recover the solid. The filtrate contains sodium chloride which is recovered by evaporating the solution to dryness.

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If a 12-volt battery produces a current of 20 amps, what is the resistance?
mixas84 [53]

Answer:

0.6 Ω

Explanation:

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

Voltage (V) = 12 V

Current (I) = 20 A

Resistance (R) =?

From Ohm's law,

V = IR

Where:

V => is the voltage

I => is the current

R => R is the resistance

With the above formula, we can obtain the resistance as follow:

Voltage (V) = 12 V

Current (I) = 20 A

Resistance (R) =?

V = IR

12 = 20 × R

Divide both side by 20

R = 12 / 20

R = 0.6 Ω

Thus the resistance is 0.6 Ω

4 0
3 years ago
True or false: You must make observations and conduct research prior to creating a hypothesis.
bekas [8.4K]

Answer:

true

Explanation:

...................

8 0
3 years ago
B) A company president would like to offer a 4.00 L cylinder containing 500 g of chlorine in the new catalog. The cylinders you
Yuri [45]

Answer:

43.1atm is the pressure using gas law and 27.2atm using Van der Waals Law.

Explanation:

Ideal gas law is:

PV = nRT

<em>Where P is pressure in atm</em>

<em>V is volume = 4.00L</em>

<em>n are moles of the gas (For chlorine Molar Mass: 70.90g/mol):</em>

<em>500g * (1mol / 70.90g) = 7.052 moles</em>

<em>R is gas constant = 0.082atmL/molK</em>

<em>T is absolute temperature = 25°C + 273 = 298K</em>

To solve the pressure, P:

P = nRT/V

P = 7.052mol*0.082atmL/molK*298K / 4.00L

P = 43.1atm is the pressure using gas law.

Van der Waals equation is:

P + a(\frac{n}{V})^2 * (V-nb) = nRT

<em>Where a is 6.58L²atm*mol⁻²</em>

<em>b = 0.056Lmol⁻²</em>

Solving for pressure:

P + a(\frac{n}{V})^2 = \frac{nRT}{(V-nb)}

P  = \frac{nRT}{(V-nb)}-a(\frac{n}{V})^2

P  = \frac{7.052mol*0.082atmL/molK*298K}{(4.00L-7.052mol*0.056L*mol)}-6.58L^2mol^{-2}(\frac{7.052mol}{4.00L})^2

P = 172.323 / 3.6051 - 20.4866

P = 27.2atm using Van der Waals Law

8 0
2 years ago
What is a low point wave called
Anit [1.1K]

The lowest point of a wave is called trough.


3 0
3 years ago
Read 2 more answers
From your instructor, obtain a handout showing one possible arrangement of the element cards. Identify each of the elements on t
Ugo [173]

Answer: Chemical Elements List with atomic number and chemical symbol

Explanation:

I attached a Word document with the chemical elements list for easier use.

Notice that the elements are order by atomic number.

Download docx
8 0
3 years ago
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