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KATRIN_1 [288]
3 years ago
11

Which of the following processes is exothermic?

Chemistry
2 answers:
nikitadnepr [17]3 years ago
5 0

Answer:

d. condensation of water

mr Goodwill [35]3 years ago
4 0

Answer:

I believe the answer is D). condensation of water.

Hope this helps, have a great day/night and stay safe!

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Which one of these is not a pathogen?
TiliK225 [7]
B, plant

A pathogen is a bacterium, virus, or other microorganisms that can cause disease. A plant does cause a disease
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4 years ago
CaCO3(s) ∆→CaO(s) + CO2(g).
sveta [45]

Answer:

74.9%.

Explanation:

Relative atomic mass data from a modern periodic table:

  • Ca: 40.078;
  • C: 12.011;
  • O: 15.999.

What's the <em>theoretical</em> yield of this reaction?

In other words, what's the mass of the CO₂ that should come out of heating 40.1 grams of CaCO₃?

Molar mass of CaCO₃:

M(\text{CaCO}_3) = 40.078 + 12.011 + 3 \times 15.999 = 100.086\;\text{g}\cdot\text{mol}^{-1}.

Number of moles of CaCO₃ available:

\displaystyle n(\text{CaCO}_3) =\frac{m}{M} = \frac{40.1}{100.086} = 0.400655\;\text{mol}.

Look at the chemical equation. The coefficient in front of both CaCO₃ and CO₂ is one. Decomposing every mole of CaCO₃ should produce one mole of CO₂.

n(\text{CO}2) = n(\text{CaCO}_3)= 0.400655\;\text{mol}.

Molar mass of CO₂:

M(\text{CO}_2) = 12.011 + 2\times 15.999 = 44.009\;\text{g}\cdot\text{mol}^{-1}.

Mass of the 0.400655 moles of \text{CO}_2 expected for the 40.1 grams of CaCO₃:

m(\text{CO}_2) = n\cdot M = 0.400655 \times 44.009 = 17.632\;\text{g}.

What's the <em>percentage</em> yield of this reaction?

\displaystyle \textbf{Percentage}\text{ Yield} = \frac{\textbf{Actual}\text{ Yield}}{\textbf{Theoretical}\text{ Yield}}\times 100\%\\\phantom{\textbf{Percentage}\text{ Yield}} = \frac{13.2}{17.632}\times 100\%\\\phantom{\textbf{Percentage}\text{ Yield}} =74.9\%.

7 0
3 years ago
The alternating rising and falling of the sea caused by the gravitational pull of the moon is called?​
Mashcka [7]

Answer: Tides are the regular, alternating rise and fall of sea level caused by the gravitational pull of the moon and sun. The changing of the tide is often rapid and dramatic. On a smaller scale, similar motions occur on large lakes, in the atmosphere, and even within the solid earth.

Explanation: can I please have brainliest?

8 0
3 years ago
Read 2 more answers
Which of the following best describes alternating current? ________
ZanzabumX [31]
I think the correct answer is b
4 0
3 years ago
Read 2 more answers
the solubilities of ammonia, carbon dioxide and oxygen in water at a constant temperature and pressure are in the ratio 27000:35
Paraphin [41]

As the intermolecular forces get weaker, the amount dissolved decreases. Ammonia can form hydrogen bonds with water thus allowing it to be more soluble. CO2 and O2 can only react through London forces, but since CO2 has a higher molecular mass, more electrons, it will have a larger in magnitude temporary dipole moment. This results in the CO2 being more soluble in water than O2.

The overall trend in solubility is NH3>CO2>O2

3 0
4 years ago
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