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tester [92]
3 years ago
15

Wofür steht die Abkürzung „PUR“?

Chemistry
1 answer:
Lunna [17]3 years ago
8 0

Explanation:

polyurethane, a polymer

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Passes through the kidneys and the good stuff is kept, and the other stuff is passed through leading to the bladder.  The once the bladder is full enough to send the message to the brain, urine (waste) is eliminated from the body.
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2. Sodium reacts with oxygen to form sodium oxide and has the following balanced chemical equation: 4 Na + O2 --> 2 Na2O. Whe
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True or false? You can follow the progress of a reaction that produces a gas using a sensitive mass
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true

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2 years ago
Write a balanced chemical equation, including physical state symbols, for the decomposition of solid calcium carbonate (CaCO_3)
nadya68 [22]

Answer:

CaCO₃(s) → CaO(s) + CO₂(g)

Explanation:

The decomposition reaction always make two compounds from one.

The products always have simpler chemical structure, originated from a determined compound. This can happens  spontaneously or by a third party.

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2H₂O (l) → 2 H₂ (g) + O₂ (g)

In this case, the calium carbonate decomposes into CaO and CO₂

These two, are the products of the decomposition.

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CaCO₃(s) → CaO(s) + CO₂(g)

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3 years ago
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Sulfuric acid dissolves aluminum metal according to the following reaction:
Fiesta28 [93]

Answer:

m_{H_2SO_4}=81.7gH_2SO_4

m_{H_2}=1.67gH_2

Explanation:

Hello,

Based on the given undergoing chemical reaction is is rewritten below:

2Al (s) + 3H_2SO_4 (aq)\rightarrow  Al _2(SO4)_3 (aq) + 3H_2 (g)

By stoichiometry we find the minimum mass of H2SO4 (in g) as shown below:

m_{H_2SO_4}=15.0gAl*\frac{1molAl}{27gAl}*\frac{3molH_2SO_4}{2molAl}*\frac{98gH_2SO_4}{1molH_2SO_4} \\m_{H_2SO_4}=81.7gH_2SO_4

Moreover, mass of H2 gas (in g) would be produced by the complete reaction of the aluminum block turns out:

m_{H_2}=15.0gAl*\frac{1molAl}{27gAl}*\frac{3molH_2}{2molAl}*\frac{2gH_2}{1molH_2} \\m_{H_2}=1.67gH_2

Best regards.

3 0
3 years ago
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