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3 years ago

Which of the following is the best indication that a chemical change has taken place?

Chemistry

2 answers:

kupik [55]3 years ago

4 0

Answer:

Explanation:

It is C because the change is inversible, that means that it is a chemical change.

Ugo [173]3 years ago

3 0

C the change is reversible I think

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Draw the structure of the bromohydrin formed when (Z)-3-hexene reacts with Br2/H2O. Use the wedge/hash bond tools to indicate st

Ipatiy [6.2K]

Answer:

(3R,4R)-4-bromohexan-3-ol

Explanation:

In this case, we have reaction called halohydrin formation. This is a markovnikov reaction with anti configuration. Therefore the halogen in this case "Br" and the "OH" must have different configurations. Additionally, in this molecule both carbons have the same substitution, so the "OH" can go in any carbon.

Finally, in the product we will have chiral carbons, so we have to find the absolute configuration for each carbon. On carbon 3 we will have an "R" configuration on carbon 4 we will have also an "R" configuration. (See figure 1)

I hope it helps!

5 0

3 years ago

Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in

igor_vitrenko [27]

Explanation:

Oxidizing agents are defined as the agents which oxidize other substance and itself gets reduced. These agents undergoes reduction reactions.

Reducing agents are defined as the agents which reduces the other substance and itself gets oxidized. These agents undergoes reduction reactions.

When oxidizing agent-A get reduced it changes green to colorless.

$A+e^-\rightarrow A^-$

When oxidizing agent-B get reduced it changes yellow to colorless.

$B+e^-\rightarrow B^-$

When oxidizing agent-C get reduced it changes red to colorless.

$C+e^-\rightarrow C^-$

1) When we added solution C that oxidizing agent-C in solution containing $B^-$ ions changes from red to yellow:

$C+B^-\rightarrow C^-+B(yellow)$

So, in this C is oxidizing $B^-$ ion into B which yellow in color.

C is reduced and $B^-$ ions is oxidized.

Here, $B^-$ are oxidized by C which means that C a better oxidizing agent than B.

2) When a solution of C is mixed with one containing A- ions, the color remains red.

$C+A^-\rightarrow$ no reaction

As we had observed that no color change was seen on adding substance C to the solution with $A^-$ ions which indicates that C was unable to oxidize $A^-$ ions. Hence, not a better oxidizing agent than A

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3 years ago

What type of change occurs when rust on a nail a. chemical change b. physical change

Korvikt [17]

Answer:

Chemical change

Explanation:

The rusting of iron/a nail is a chemical change

Iron (Fe) and Oxygen (O) combine to create the compound Iron Oxide (Fe2O3), which is rust.

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3 years ago

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yawa3891 [41]

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3 years ago

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Sergio [31]

Answer:

yuh

Explanation:

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3 years ago