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klasskru [66]
3 years ago
10

Which of the following techniques is most appropriate for the recovery of solid KNO3 from an aqueous solution of KNO3?

Chemistry
1 answer:
Oxana [17]3 years ago
3 0

Answer: option E. Evaporation to dryness

Explanation:

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Another name for light is
Karo-lina-s [1.5K]

Answer:

Another name for light is ¨Electromagnetic Radiation, luminous energy, and/or radiant energy.¨

Explanation:

Light is the electromagnetic radiation that´s capable of causing a visual sensation and has wavelengths from about 380 to about 780 nanometres. Electromagnetic radiation includes Radio Waves, Microwaves <u>(used in microwaves)</u>, Infrared Radiation <u>(heat)</u>, Visible Light <u>(the colors we see)</u>, Ultraviolet <u>(the UV radiation that causes sunburns)</u>, X-Rays <u>(used in medical X-Rays)</u>, and Gamma Rays <u>(which can be used to treat cancer)</u>. Light waves are transverse waves because they only travel east or west, but their crests and troughs face north and south (if desplayed on a coordinate grid). They wouldn´t be longitudinal waves because these waves don´t have vertical crests and troughs.

I hope this helps!

6 0
2 years ago
Name a property of liquids that they do not share with solids.​
neonofarm [45]
They flow and can take the shape of their container
5 0
3 years ago
Read 2 more answers
when a substance goes through a chemical change, it forms a new substance that has different physical and chemical properties
Westkost [7]
True. The thing about chemical changes is that it is not easily reversible and new substances having different chemical properties are formed. For example; burning of wood to ashes.
5 0
3 years ago
The standard cell potential (E°) of a voltaic cell constructed using the cell reaction below is 0.76 V: Zn (s) + 2H+ (aq) → Zn2+
barxatty [35]

Answer:

[H⁺] = 1.30X10⁻⁴ M

Explanation:

the problem will be solved by using Nernst's equation, which is :

E_{cell}=E^{0}_{cell}- \frac{0.0592}{n}logQ

In the given equation

n = 2

Q = =\frac{[Zn^{+2}][p_{H2}]}{[H^{+}]^{2}}

Putting values

0.53= 0.76 - \frac{0.0592}{n}log(\frac{1X1}{[H^{+}]^{2}})

on calculating

[H⁺] = 1.30X10⁻⁴ M

6 0
4 years ago
A sample of hydrogen gas was collected over water at 36°C and 855 mm Hg. The volume of the container was 6.50 L. Calculate the m
iren [92.7K]

Answer:

The amount of hydrogen gas collected will be 0.5468 g

Explanation:

We are given:

Vapor pressure of water = 44.6 torr = 44.6 mm Hg

Total vapor pressure = 855 mm Hg

Vapor pressure of hydrogen gas = Total vapor pressure - Vapor pressure of water = (855 - 44.6) mmHg = 810.4 mmHg

To calculate the amount of hydrogen gas collected, we use the equation given by ideal gas which follows:

PV=nRT

where,

P = pressure of the gas = 810.4 mmHg

V = Volume of the gas = 6.50 L

T = Temperature of the gas = 36^oC=[36+273]K=309K

R = Gas constant = 62.3637\text{ L.mmHg }mol^{-1}K^{-1}

n = number of moles of hydrogen gas = ?

Putting values in above equation, we get:

810.4mmHg\times 6.50L=n\times 62.3637\text{ L.mmHg }mol^{-1}K^{-1}\times 309K\\\\n=\frac{810.4\times 6.50}{62.3637\times 309}=0.2734\ mol

To calculate the mass from given number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Moles of hydrogen gas = 0.2734 moles

Molar mass of hydrogen gas = 2 g/mol

Putting values in above equation, we get:

0.2734mol=\frac{\text{Mass of hydrogen gas}}{2g/mol}\\\\\text{Mass of hydrogen gas}=(0.2734mol\times 2g/mol)=0.5468g

<u>Hence, the amount of hydrogen gas collected will be 0.5468 g</u>

7 0
3 years ago
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