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dusya [7]
3 years ago
14

Quick little question :)

Chemistry
1 answer:
blondinia [14]3 years ago
6 0

Answer:

Nine isomers  

Step-by-step explanation:

There are nine isomers of heptane.

The chain lengths vary from four to nine carbon atoms.

The number of substituents on the main chain, their locations on the chain, and their identities are different in each isomer.

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What evidence supports a scientist's conclusion that fossil B is older than fossil A? (4 points)
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Answer:

Choice B, as time goes on the surface level rises and stuff buried underground gets further and further below surface level.

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Which of the following reactions is spontaneous?
AveGali [126]
Answer is: <span>lumps os sugar dissolving in water.
Sugar has very good solubility in water and it dissolves readily, which is </span><span>example of a physical change.
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3 years ago
Density of water is 1 g/ml. If a piece of wood with a density of 5 g/ml is
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The piece of wood will sink

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6 0
2 years ago
Given the equation Ca + H2O --&gt; Ca(OH)2 + H2 how many grams of calcium will react completely with 10.0 grams of water? *
Yuki888 [10]

Answer: 11.0 g of calcium will react with 10.0 grams of water.

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To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

moles of H_2O

\text{Number of moles}=\frac{10.0g}{18g/mol}=0.55moles

The balanced chemical equation is:

Ca+2H_2O\rightarrow Ca(OH)_2+H_2

According to stoichiometry :

2 moles of H_2O require = 1 mole of Ca

Thus 0.55 moles of H_2O require=\frac{1}{2}\times 0.55=0.275moles  of Ca  

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Thus 11.0 g of calcium will react with 10.0 grams of water.

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