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Marat540 [252]
3 years ago
9

How do the particles in matter change when a substance becomes hotter, cools down, or changes state

Chemistry
1 answer:
Archy [21]3 years ago
7 0
Colder- moves slower
warmer- moves faster
changes state:
    solid to gas- warmer
    gas to solid- colder
    something like that
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A sample of Freon-12 (CF2Cl2) occupies 2.842 x 101 L at 331 K and 2.525 x 102 kPa. Find its volume (in L) at standard temperatur
Angelina_Jolie [31]
We have to first find the number of moles of Freon-12 in the sample using the ideal gas law equation
PV = nRT
n = \frac{PV}{RT}
since the number of moles at both conditions given and at stp we can write the following formula 
\frac{P1V1}{RT1} =  \frac{P2V2}{RT2}
where parameters for the given conditions are on the left side and parameters for STP conditions are on the right side of the equation
where P1 - pressure - 252.5 kPa
V1 - volume - 28.42 x 10⁻³ m³ 
R - universal gas constant 
T1 - 331 K

STP conditions 
P2 - 101 325 Pa
T2 - 273 K

substituting these values in the equation 

\frac{252 500Pa*28.42*10 ^{-3}m^{3}  }{R*331K} =  \frac{101325 Pa*V}{R*273 K}

V = 58.41 L
Volume at STP is 58.41 L
3 0
3 years ago
How many grams of copper Cu, 63.54 g/mol are in 3.42 moles copper
DIA [1.3K]
Answer:
              Mass  =  217.30 g

Solution:

Mass and moles are related to each other as,

                                  Moles  =  Mass / M.mass  ---- (1)

Where;
            Moles  =  3.42

            M.Mass  =  63.54 g.mol⁻¹

Solving eq. 1 for Mass,

                                  Mass  =  Moles × M.mass
Putting Values,
                                  Mass  =  3.42 mol × 63.54 g.mol⁻¹

                                  Mass  =  217.30 g
7 0
3 years ago
An alkane with the formula C6H14 can be prepared by hydrogenation of either of two precursor alkenes having the formula C6H12. W
EleoNora [17]
            
             H  H H H H H
              |   |   |   |   |   |
         H-C-C-C-C-C-C-H  
              |   |   |   |   |   | 
             H  H H H H H
This is the structural formula for C6H14. Every carbon atom in the molecule must be surrounded by four bonds. Hope this answers your question. 



8 0
3 years ago
Please help... will give brainiest
Dvinal [7]

Answer:

The answer will be :

In year 1869

Russian scientist named Dmitri Mendeleev

Chart called Mendeeleves periodic table

increasing atomic masses

physical and chemical properties.

Hope this Helps

Best of luck !!

7 0
2 years ago
The ionization constant (Ka) of HF is 6.7 X 10 ^-4. Which of the following is true in a 0.1 M solution of this acid?
spin [16.1K]
The ionization equation is:

HF ⇄ H(+) + F(-)

The ionization constant is Ka = [H(+)] * [H(-)] / [HF]

=> [H(+)] * [F(-)] = Ka * [HF]

Given that Ka < 1

[H(+)] * [F(-)] < [HF]

Which is [HF] >  [H(+)] * [F(-)] the option a. fo the list of choices.
8 0
3 years ago
Read 2 more answers
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