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3 years ago

1. A chemical equation is balanced when *

Chemistry

2 answers:

wel3 years ago

7 0

Answer:

If each side of the equation has the same number of atoms of a given element, that element is balanced. If all elements are balanced, the equation is balanced.

lubasha [3.4K]3 years ago

6 0

Answer:1 Answer. A chemical equation is balanced when the number of each kind of atom is the same on both sides of the reaction,,

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Which line of evidence has been traditionally accepted as conclusive proof of evolution? the presumed age of the Earth the fossi

Nataly_w [17]

The most generally accepted form of conclusive evidence for the theory of Evolution is the fossil record.

<h3>What is the theory of Evolution?</h3>

The theory of evolution was proposed by Charles Darwin.
It states that as time passes, organisms evolve to better adapt to their environments.
This is closely related to natural selection, which is considered a driving force of evolution.

<h3>How the fossil record supports this theory</h3>

The fossil record provides essential data to support this claim.
The data comes in the form of the comparison between fossils of two closely related organisms, separated by a matter of generations, that present changes in the genetic code that made them more apt for survival.

Therefore, we can confirm that the most generally accepted form of conclusive evidence for evolution is the presence of fossils that show the genetic correlation between two organisms and the progression of evolution between them.

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3 years ago

Can a compound have more than one carbon-carbon double bond in it?

kiruha [24]

Answer:

yes, a compound can have more than one carbon-carbon double bond

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3 years ago

A buffer solution contains 0.496 M hydrocyanic acid and 0.399 M sodium cyanide . If 0.0461 moles of sodium hydroxide are added t

pochemuha

Answer : The pH of the solution is, 9.63

Explanation : Given,

The dissociation constant for HCN = $pK_a=9.31$

First we have to calculate the moles of HCN and NaCN.

$\text{Moles of HCN}=\text{Concentration of HCN}\times \text{Volume of solution}=0.496M\times 0.225L=0.1116mole$

and,

$\text{Moles of NaCN}=\text{Concentration of NaCN}\times \text{Volume of solution}=0.399M\times 0.225L=0.08978mole$

The balanced chemical reaction is:

$HCN+NaOH\rightarrow NaCN+H_2O$

Initial moles 0.1116 0.0461 0.08978

At eqm. (0.1116-0.0461) 0 (0.08978+0.0461)

0.0655 0.1359

Now we have to calculate the pH of the solution.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

Now put all the given values in this expression, we get:

$pH=9.31+\log (\frac{0.1359}{0.0655})$

$pH=9.63$

Therefore, the pH of the solution is, 9.63

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3 years ago

What are the benefit of understanding physical properties?

klasskru [66]

Physical properties help identifying a substance and how it changes.
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And eventually the substance would not end up forming a new substance.
Look at the picture below to understand more about physical changes.

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4 years ago

Which statement describes carbohydrates?

DedPeter [7]

Answer:

B.)

Explanation:

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4 years ago

Read 2 more answers