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Shalnov [3]
3 years ago
5

What describes a phase change

Chemistry
1 answer:
Finger [1]3 years ago
3 0
A phase change is when matter changes to from one state ( solid, liquid, gas, plasma) to another.
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The molecules in a sample of oxygen gas are in constant motion. What does an increase in temperature indicate about the movement
Basile [38]

Answer:

An increase in temperature indicates that the molecules of gas speed up.


Explanation:


The molecular kinetic theory states that the average kinetic energy of gas particles (molecules) is proportional to the absolute (Kelvin) temperature of the gas, and all gases at the same temperature have the same average kinetic energy.


Therefore, as the temperature increases so the kinetic energy increases.


It is also known that the kinetic energy is proportional to the squared speed of the particles, therefore the higher the kinetic energy the average speed of the molecules:


  • higher temperature → higher kinetic energy → higher average speed
4 0
3 years ago
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For the reaction 2h2+o2>h20, how many grams of water are produced from 70 grams of hydrogen
KonstantinChe [14]

630g

Explanation:

firstly the equation has to be balanced. 2H2+o2>2H2o.

finding the mole of hydrogen?

mole = 70/2 which is equal to 35 mole of hydrogen.

35 mole of hydrogen is equal to the mole of water.

finding the mass of water=?

35=mass/18

mass= 35*18=630g of water

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3 years ago
How many moles of solve (Ag) are equivalent to 68.3g Ag
Zina [86]
Moles Ag = 68.3 g / 107.868 g/mol=0.633
5 0
4 years ago
What is the compound name for the chemical formula FECO3
Zarrin [17]
Iron (ii) carbonate
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3 years ago
Devices that allow you to do work in an easier way.​
IrinaVladis [17]

Answer:

The most notable of these are known as the "six simple machines": the wheel and axle, the lever, the inclined plane, the pulley, the screw, and the wedge, although the latter three are actually just extensions or combinations of the first three.

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