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Pepsi [2]
3 years ago
14

Which of the following is not an example of a chemical change?

Chemistry
1 answer:
kaheart [24]3 years ago
8 0

The answer is A. Melting snow because it is a physical change because you can then trun around and make it snow again

Physical change you can turn it back to the original

Chemical you can not

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Draw the curved arrow mechanism for the formation of an acetal from acidic methanol and 4-methylpentan-2-one in the fewest steps
morpeh [17]

Answer:

See explanation below

Explanation:

This reaction is known as Ketone hydrolisis in acid medium. This involves the formation of an hemi cetal, and then, the acetal. This is often used to convert ketones or aldehydes in ethers.

The first step involves the reaction with the acid. The carbonile reacts with the acid and forms an alcohol there. The next step is the reaction of the alcohol, in this case, the methanol to form the hemi cetal. Then in the third step, we repeat the first step, using acid to turn the OH group into a great leaving group such water. Then the water leaves the molecule, leaving the space wide open in the next step for methanol, and the acetal is formed.

See picture for the curved arrow mechanism

7 0
3 years ago
08.04 MC) An unknown solution has a pH of 7.2. Which of these chemicals is likely to cause the greatest decrease in the pH of th
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Answer:

HNO3

Explanation:

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6 0
3 years ago
The following steps refer to various stages in transmission at a chemical synapse. 1. Neurotransmitter binds with receptors asso
Furkat [3]

Answer:

3,2,5,1,4

Explanation:

A chemical synapse begins when an (3)<em>action potential reaches the axon terminal depolarizing the membrane</em> leading to the opening of the voltage-gated Na+ channels, this Na+ ions will then depolarize the presynaptic membrane, opening the voltage-gated Ca2+ channels. (2)<em>Calcium ions then will initiate a cascade entering the neuron </em>that will lead to the fusion of synaptic vesicles with the presynaptic membrane (5)<em>causing the releasing of neurotransmitters into the synaptic cleft.</em> (1)<em>These neurotransmitter will diffuse across the synaptic place in order to bind to the receptors on the postsynaptic membrane,</em> (4)<em>particulary into the ligand-gated channels, opening them.</em>

I hope you find this information useful and interesting! Good luck!

7 0
3 years ago
The function of the respiratory system is to ________. create oxygen and break down carbon dioxide supply the body with oxygen a
rosijanka [135]

Answer:

Explanation: the function of the respiratory system is to supply the blood with oxygen in order for the blood to deliver oxygen to all parts of the body.

6 0
2 years ago
Process that changes one set of chemicals into another.
dmitriy555 [2]

Answer:

  • Chemical Reactions

Explanation:

  • A process that changes or transforms one set of chemicals into another.

Source:

  • Section 2.4 Chemical Reactions and Enzymes - Quizlet
7 0
2 years ago
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