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SpyIntel [72]
4 years ago
9

What answers below correctly identifies the type of change and explanation for the mixture of calcium carbonate and hydrochlorid

e acid
Chemistry
2 answers:
vodka [1.7K]4 years ago
7 0

The correct answer is chemical change because gas formation was observed, which indicated that the calcium carbonate was transformed into a different substance

NemiM [27]4 years ago
3 0

The type of change is chemical change. This reaction yields compounds with different identities that is carbon dioxide,Calcium chloride and water

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8. At higher temperatures _______.
DanielleElmas [232]

Answer:

B. particles in an object move faster

Explanation:

At higher temperatures, particles in an object moves faster.

Temperature is the degree of hotness or coldness of a body.

  • At higher temperature, the substance is very hot.
  • Temperature is related to the heat energy content of a body
  • As the temperature increases, the average kinetic energy of the particles of system increases more and more.
  • This is in compliance with the kinetic molecular theory of matter.
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3 years ago
The voltage for the following cell is +0.731 V. Find Kb for the organic base RNH2. Use EscE 0.241V.
tino4ka555 [31]

Complete Question

The complete question is shown on the first uploaded image  

Answer:

The  value is   K_b  =   1.89 *10^{-6}

Explanation:

From the question we are told that

   The  voltage of the cell is  V  =  0.731 \  V

Generally K_b is mathematically represented as  

           K_b  =  \frac{K_w }{ K_a }

Where  K_w  is the equilibrium constant for this auto-ionization of water with a value  K_w  =  1.0 *10^{-14}

Generally the E_{cell} is mathematically represented as

       E_{cell} =  V  -  E_{SCE}

=>     E_{cell} =  0.731 - 0.241

=>       E_{cell} =   0.49 V

This  E_{cell} is mathematically represented as

             E_{cell} =  \frac{0.0592}{n} *  log K_a

Where n is the number of moles which in this question is  n = 1

         So  

         0.490 =  \frac{0.0592}{1}  *  log K_a

=>      K_a  =  5.30*10^{-9}

So  

     K_b  =  \frac{ K_w}{ K_a}

=>   K_b  =  \frac{1.0 *10^{-14}}{ 5.30*10^{-9}}

=>    K_b  =   1.89 *10^{-6}

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3 years ago
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irina [24]

Answer:

The correct answer to that question is glaciers, waves, wind.

7 0
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Explain how changing the amount of greenhouse gases in the atmosphere affects the flow of heat out of Earth's atmosphere.
antiseptic1488 [7]

Explanation:

The added greenhouse gases absorb the heat. They then radiate this heat. Some of the heat will head away from the Earth, some of it will be absorbed by another greenhouse gas molecule, and some of it will wind up back at the planet's surface again. With more greenhouse gases, heat will stick around, warming the planet.

8 0
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