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horrorfan [7]
3 years ago
5

Write a molecular equation for the gas-evolution reaction that occurs when you mix aqueous hydroiodic acid and aqueous sodium su

lfite.
Chemistry
1 answer:
Leona [35]3 years ago
6 0
First, we construct the reaction equation:

Na₂SO₃ + 2HCl → 2NaCl + SO₂ + H₂O

H₂SO₃ is formed as an intermediate but decomposes to water and SO₂ gas.
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A _________________ is developed through the scientific method, and it can be modified or improved upon. It may be represented b
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I think that the best phrase to fit into the blank is a "scientific theory".

A scientific theory is developed through experiments which use the scientific method, and a theory can be improved if additional data is available or if people provide suggestions which make the theory fit the data better. 
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3 years ago
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The molar heat of fusion for water is 6.01 kJ/mol. How much energy must be added to a 75.0-g block of ice at 0°C to change it to
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I believe it is <span>25.04 kJ</span>
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3 years ago
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Need help with cemester​
sladkih [1.3K]

Answer:

See explanation

Explanation:

20 = B

21 = C

22 = D

23 = B

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3 years ago
Calcium oxide (CaO), an important ingredient in cement, is produced by decomposing calcium carbonate (CaCO3) at high temperature
alisha [4.7K]

Answer:

0.0018 mol/min is the average rate of carbon dioxide gas production in moles per minute during the 10 minutes.

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Pressure of carbon dioxide gas = P = 0.25 atm

Volume of carbon dioxide gas = V = 5.0 L

Moles of carbon dioxide gas = n

Temperature of the carbon dioxide gas,T = 550°C = 550+273 K = 823 K

Using an ideal gas equation :

PV=nRT

n=\frac{PV}{RT}=\frac{0.25 atm\times 5.0 L}{0.0821 atm L/mol K\times 823 K}

n = 0.018 mol

In 10 minutes pressure of carbon dioxide gas reached to 0.25 atm

Average rate of production of moles of carbon dioxide gas per minute in duration of 10 minutes:

=\frac{0.018 mol}{10 min}=0.0018 mol/min

0.0018 mol/min is the average rate of carbon dioxide gas production in moles per minute during the 10 minutes.

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After 1911, most scientists accepted the theory that the nucleus of an atom was very dense and very small and had a positive cha
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I believe it is D

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since Rutherford's explanation, when he made it in 1911, was that scattering was caused by a hard, dense court to centre of the Adam, which is the nucleus and he used Alpha particles to observe the scattered backwards from a gold foil

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