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Ahat [919]
2 years ago
6

A log burns to ashes in a fireplace what kind of change is this​

Chemistry
2 answers:
FrozenT [24]2 years ago
6 0

Answer:

Chemical Change

Explanation:

Burning of wood is a chemical change as new substances which cannot be changed back [e.g. carbon dioxide] are formed. For example, if wood is burned in a fireplace, there is not wood anymore but ash.

KengaRu [80]2 years ago
3 0

Answer:

A log burning to ashes is a chemical change.

Explanation:

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The molar absorptivity of a tyrosine residue at 280 nm is 2000 M-1cm-1, while for tryptophan it is 5500 M-1cm-1. A protein has b
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Answer:

There are 4 tryptophans in the protein.

Explanation:

According to question,  protein contains one tyrosine residue and say x number of tryptophans.

Concentration of protein solution = 1.0 micromolar = 1.0\times 10^{-6} Molar

Molar absorptivity of a protein solution : \epsilon

\epsilon = \epsilon _{tyro}+\epsilon _{tryp}

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Length of the cuvette = l = 1.0 cm

Absorbance of protein solution at 280 nm = A = 0.024

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Solving for x :

x = 4

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Explanation:

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How many liters of oxygen are required to react completely with 14.8 mol of Al?
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Answer:

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Explanation:

We will need a balanced equation with moles, so let's gather all the information in one place.

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n/mol:        17.4

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n = \text{17.4 mol Al}\times \dfrac{\text{3 mol O}_{2}}{\text{4 mol Al}}= \text{13.05 mol O}_{2}

2. Volume of O₂

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At STP the molar volume of a gas is 22.71 L.

V = \text{13.05 mol}\times \dfrac{\text{22.71 L}}{\text{1 mol }}= \textbf{296 L}

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2 years ago
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