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MrMuchimi
4 years ago
9

What elements are in the phone screen ?

Chemistry
1 answer:
gavmur [86]4 years ago
4 0

Answer:

I believe it would be these elements...

Explanation:

1. Aluminum

2. Silicon

3. Potassium

(I may be wrong, but I double checked)

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Name the center of circles s
Mekhanik [1.2K]

Answer: point equidistant

Explanation:

4 0
3 years ago
Read 2 more answers
The equation that describes the change in temperature of a solvent due to a solute is AT6 = i xKb x molality. How much salt woul
dedylja [7]

4.9 moles of salt are required to be added to 1 kg water to change the boiling temperature

by 5°C.

<h3>What is the moles of Salt required to change the temperature of water by 5°C?</h3>

Based on the given equation, the molality of the solution is calculated as follows:

  • Molality = change in temperature/ Kb × I

Change in temperature = 5 °C

Kb = 0.51

i = 2

Molality = 5/0.51 × 2 = 4.9 molal

Also, Molality = moles/kg of water

Moles of salt = molality × kg of water

Moles of salt = 4.9 × 1 = 4.9 moles.

Therefore, 4.9 moles of salt are required to be added to 1 kg water to change the boiling temperature

by 5°C.

Learn more about molality at: brainly.com/question/9149034

#SPJ1

7 0
2 years ago
Hydrates that have a low vapor pressure and remove moisture from air are said to be ___. Question 8 options: effloresce hygrosco
-Dominant- [34]

Answer:

Hygroscopic

Explanation:

An hygroscopic substance is one that absorbs moisture from the atmosphere and becomes wet. Their ability to remove water from air is less than that of deliquescent substances. Most of the solid hygroscopic substances forms pasty substances and not solutions like the deliquescent compounds.

Examples are sodium trioxonitrate(v), copper(ii) oxide e.t.c

Efflorescence compounds gives off their water of crystallization to the atmosphere.

4 0
3 years ago
You have 4 moles of a gas in a 50 L container held at 2 atm pressure. Currently the temperature is 27 ºC. R = 0.0821 L*atm/(mol*
Mariulka [41]
The formula used for determining gas pressure, volume and temperature interaction would be PV=nRT. 

<span>• What is the temperature in Kelvins?
</span>You already right at this part. Kelvin temperature formula from celsius should be:
K= C+273.15= 
<span>K= 27 +273.15 = 300.15 
It is important to remember that the formula in this question is using Kelvin unit at temperature, not Celcius or Fahrenheit.
</span>
<span>• Assuming that everything else remains constant, what will happen to the pressure if the temperature decreases to -15 ºC?
</span>In this case, the temperature is decreased from 27C into -15C and you asked the change in the pressure.
Using PV=nRT formula, you can derive that the temperature will be directly related to pressure. If the temperature decreased, the pressure will be decreased too. 

<span> If you increase the number of moles to 6 moles, increase temperature to 400K and reduce the volume to 25 L, what will the new pressure be?
</span>PV=nRT
P= nRT/V
P= 6 moles* <span>0.0821 L*atm/(mol*K) * 400K/25L= 7.8816 atm</span>
3 0
3 years ago
Select all that apply.
Fantom [35]

Answer:

1 kg=1000g so 2000 g=2kg and 1 liter of water is equal to 1 kg .as a result 2 kg=2l and if consider 1l as 1000 ml we get 2000 ml

the final answer is 2000 g of water equal to 2000 ml

3 0
3 years ago
Read 2 more answers
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