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musickatia [10]
3 years ago
10

If a student performs an exothermic reaction in a calorimeter, how does the calculated value of ΔH (Hcalc) differ from the actua

l value (Hactual) if the heat exchanged with the calorimeter is not taken into account?
Chemistry
1 answer:
devlian [24]3 years ago
7 0

Answer:

The actual ∆H would be greater than the calculated value of ∆H with no calorimeter.

Explanation:

The amount of heat changed during this process at a fixed pressure is termed Enthalpy

enthalpy change ∆H = ∆E + P∆V

∆E = internal energy change

P = fixed pressure

∆V = change in volume

When energy is absorbed during reaction, it is called endothermic reaction.

Endothermic reaction carried out in the calorimeter and enthalpy change for the reaction. Since we have that

q(surrounding) = q(solution)+q(calorimeter)

Therefore, q(calorimeter) > 0(endothermic).

The actual ∆H would be greater than the calculated value of ∆H with no calorimeter.

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What happens when Aluminium metal is added to copper sulphate solution
AlexFokin [52]

Answer:

The colour of the solution will change from blue to transparent and copper will be observed as a layer on the Aluminium piece.

Explanation:

The colour of the solution will change from blue to transparent and copper will be observed as a layer on the Aluminium piece.

8 0
3 years ago
3. What determines that an element is a metal?
Bingel [31]

Answer:

if it forms from positive ions and has types of metallic bonds

Explanation:

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3 years ago
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Planck's constant, h, is 6.626 x 10-34 Js. The speed of light in a vacuum, c, is 3.00 x 108 m/s. Calculate the energy of ultravi
igomit [66]

Given the Planck's constant and the speed of light, the energy of the ultraviolet light with a frequency of 9.58×10¹⁴ Hz is 6.35×10¯¹⁹ J (Option C)

<h3>Data obtained from the question </h3>
  • Planck's constant (h) = 6.626×10¯³⁴ Js
  • Speed of light (v) = 3×10⁸ m/s
  • Frequency (f) = 9.58×10¹⁴ Hz
  • Energy (E) =?

<h3>How to determine the energy </h3>

The energy of the ultraviolet light can be obtained as follow:

E = hf

E = 6.626×10¯³⁴ × 9.58×10¹⁴

E = 6.35×10¯¹⁹ J

Learn more about energy:

brainly.com/question/10703928

8 0
2 years ago
What chemical changes occur during photosynthesis
Yakvenalex [24]

Answer:

Water and carbon dioxide combine to form glucose and oxygen.

I hope this helped :)

7 0
3 years ago
Read 2 more answers
1930. kg to lb ( need 4 sig fig)
anzhelika [568]

<u>Answer:</u> The correct answer is 4256 lb

<u>Explanation:</u>

We are given:

A numerical value of 1930 kilo grams

To convert this into pounds, we use the conversion factor:

1 kg = 2.205 lb

Converting the given value into pounds, we get:

\Rightarrow 1930kg\times \frac{2.205lb}{1kg}=4256lb

Hence, the correct answer is 4256 lb

5 0
4 years ago
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