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Anna [14]
2 years ago
8

In an experiment, equal amounts of water and soil were first heated and then left to cool. The graph shows the change in tempera

ture for each with time.
A graph with the title Change in Temperature is shown. The y axis title is Temperature in degree C and the x axis title is Time in seconds. An inverted U shaped curve labeled A is plotted. A flatter curved line labeled B is also shown plotted on the graph.

Which statement about the curves A and B is true?

Curve A represents how soil takes longer to heat and longer to cool.
Curve B represents how water takes longer to heat and longer to cool.
Curve A represents water as it heats rapidly and cools slowly.
Curve B represents soil as it heats slowly and cools rapidly.

If you don't understand, here's the image.

Chemistry
2 answers:
poizon [28]2 years ago
5 0

Answer:

ITS A

Explanation:

im taking same quiz lol and its correct <3 have a nice day UwU

AveGali [126]2 years ago
3 0

Answer: A

Explanation:

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Electrochemistry - Equilibrium
Ipatiy [6.2K]

Answer:

Explanation:

The relation between equilibrium constant and Ecell is given below .

E⁰cell = (RT / nF ) lnK  , F is faraday constant T is 273 + 25 = 298 K

E⁰cell  =  1.46 - 1.21 = .25 V

n = 2

Putting the values

.25 = (8.314 x 298  lnK) / (2 x 96485 )

lnK = 19.47

K = 2.85 x 10⁸

2 )

Change in free energy Δ G

Δ G ⁰ = nE⁰ F

n = 4

E⁰ = .4 + .83 = 1.23 V

Δ G ⁰= 4 x 1.23 x 96485

= 474706 J / mol

3 )

E⁰cell = (RT / nF ) lnK

n = 2

1.78 = 8.314 x 298  lnK / 2 x 96485

lnK = 138.638

K = 1.62 x 10⁶⁰

8 0
3 years ago
What are two reasons why scientists use the metric system
omeli [17]
The metric system is used because it is based on the number 10. Ten is easy to use for mathematical operations and conversions.

It is also easy to use for scientific notation when you are referring to powers of ten. There are extremely large and extremely small numbers in science. Thus, scientific notation allows for accurate abbreviated ways to symbolize these numbers. For instance, if I were to say 1,000, in scientific notation it would be 1 x 10 ^3. If I was to say 1,000,000, I would scientifically write 1 x 10 ^6.  

4 0
3 years ago
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Explain using the particle theory why objects generally expand when heated and contract when cooled?
seraphim [82]
When heated, particles vibrate faster, thus increasing the distance between one another. The distance between these particles results in changes of state. Therefore, increased molecular motion results in expansion of an object. This works vice versa for cooling. As the vibrations slow down, the particles become closer together. This results in contraction.
4 0
3 years ago
What acid occurs naturally in the body and performs important regulatory functions
gtnhenbr [62]

Answer: carbonic acid

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If a mixture of gases contained 78% nitrogen at a pressure of and 22% carbon dioxide at , what is the total pressure of the syst
Naddika [18.5K]
The pressures given are the partical pressures of the two gases.

The law of Dalton or of the partial pressures states that the total pressure of a mixture of gases is equal to the sum of the pressures of all the gases.

So, in this case:

Total pressure = pressure of nitrogen + pressure of carbon dioxyde.

Of course both terms must be in the same units.

i have found that the pressures for this problem are:

Pressure of nitrogen = 984 torr

Pressure of carbon dioxyde = 345 torr

Total pressure = 984 torr + 345 torr = 1329 torr.

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