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2 years ago

A scientist would most likely need to update her model when it

Chemistry

2 answers:

NeTakaya2 years ago

7 0

Answer:

When the model no more supports the latest results.

Explanation:

Model is the term used for the demonstration of a system or an idea, a process of an object that has an application in illustrating and demonstrating a phenomenon. The central models are used by the scientists for both in research and in communicating an explanation. The models are used by the scientists to offer the way on how to illustrate data in order to demonstrate it as a hypothesis. However, scientists are required to update their models when it no longer supports the present results.

Marizza181 [45]2 years ago

5 0

A scientist would most likely need to update her model when it no longer supports the latest results.

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Which combination of reagents used in the indicated order with benzene will give m-nitropropylbenzene? a. 1) CH3CH2CH2Cl/AlCl3,

VladimirAG [237]

Answer:

1) HNO3/H2SO4, 2) CH3CH2CH2Cl/AlCl3

Explanation:

Benzene is a stable aromatic compound hence it undergoes substitution rather than addition reaction.

When benzene undergoes substitution reaction, the substituent introduced into the ring determines the position of the incoming electrophile.

If I want to synthesize m-nitropropylbenzene, I will first carry out the nitration of benzene using HNO3/H2SO4 since the -nitro group is a meta director. This is now followed by Friedel Craft's alkykation using CH3CH2CH2Cl/AlCl3.

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2 years ago

What most likely led to a change in the widely accepted theory of evolution? new experiments involving genes and evolution exper

ss7ja [257]

Incomplete question. Full question reads;

Darwin developed the theory of evolution to explain why there are so many different kinds of living things. He could easily observe that offspring of any animals were slightly different from their parents and that this could allow for big changes over thousands of years. He did not know that genes caused the differences. Genes are now very important in the modern theory of evolution.

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Answer:

new experiments involving genes and evolution

Explanation:

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Hence, new experiments involving genes and evolution has led to a change (disagreements and few agreements) in the widely accepted theory of evolution.

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2 years ago

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harkovskaia [24]

Answer:

Yes. Example: Sulfur hexafluoride (SF₆) molecule

Explanation:

According to the octet rule, elements tend to form chemical bonds in order to have 8 electrons in their valence shell and gain the stable s²p⁶ electronic configuration.

However, this rule is generally followed by main group elements only.

Exception: SF₆ molecule

In this molecule, six fluorine atoms are attached to the central sulfur atom by single covalent bonds.

Each fluorine atom has 8 electrons in their valence shells. Thus, it follows the octet rule.

Whereas, there are 12 electrons around the central sulfur atom in the SF₆ molecule. Therefore, sulfur does not follow the octet rule.

Therefore, the SF₆ molecule is known as a hypervalent molecule or expanded-valence molecule.

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Setler79 [48]

Hot liquid rock comes in contact with Earth´s cold crust

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3 years ago

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