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anygoal [31]
2 years ago
11

What is the most important thing you need to remember for physical change?

Chemistry
1 answer:
Verizon [17]2 years ago
5 0
The most important thing you need to know about physical change, is that a physical change does not change the identity, or chemical make up of an object or substance. For example, if you were to have an orange, and you painted it blue, it is still an orange, whereas if you burned the orange, it is no longer an orange. It would be soot/ash. 
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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
2 years ago
What is the mass spectrom​
NARA [144]

Answer:

Here's your Answer

Explanation:

the mass spectrum is the graphical representation of the ion abundance versus the mass to charge of the ions separated in mass spectrometer

7 0
3 years ago
This family (ethane, propane, butane, etc) of materials is likely to have what set of properties?
Ilya [14]

This family (ethane, propane, butane, etc) of materials is likely to have following set of properties.

  • The alkanes are non- polar solvents.
  • The alkanes are immiscible in water but freely miscible in other non-polar solvent .
  • The alkanes are consisting of weak dipole dipole bonds can not breaks the strong hydrogen bond.
  • The alkanes having only carbon (C) and hydrogen (H) atom which is bonded by a single bonds only.
  • The alkanes posses weak force of attraction that is weak van der waals force of attraction.

The ethane, propane, butane, belong to alkanes family.The alkanes are also considers as saturated hudrocarbons. Ethane is found in gaseous stae Ethane is the second alkane followed by propane followed by butane.

learn about butane

brainly.com/question/14818671

#SPJ4

7 0
2 years ago
How many elements and atoms are in marble
DochEvi [55]

Answer:

Explanation:

Scientists know that there are 6x1023 molecules in a mole - so we have about 0.5x1023 molecules in our marble…and since every silicon dioxide molecule has one atom of silicon and two of oxygen, we have a grand total of 1.5x1023 atoms. That's 150,000,000,000,000,000,000,000 atoms

7 0
2 years ago
Which statement is true about the patterns shown on the electromagnetic spectrum?
Rudiy27
A. As wavelength increases, radiant energy and frequency increase.
5 0
2 years ago
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