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irinina [24]
3 years ago
12

Question 6 / 20

Chemistry
2 answers:
JulsSmile [24]3 years ago
8 0

Answer:

A. The mass of a system does not change during a chemical reaction

Explanation:

Correct Answer

astraxan [27]3 years ago
5 0

Answer:

i gussss D is the answer may be

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What are the good and bad effects of bacteria​
sergiy2304 [10]

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they are bacteria

Explanation:

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3 years ago
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A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.11 g/mL, 1.8
ehidna [41]

Answer:

D. her results are neither precise, nor accurate

Explanation:

Reason being that: First, she obtained four different result for an experiment ( obviously it's supposed to be one value for the different procedure or atleast very close range) sugar solution and all four values were far apart.

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3 years ago
The hydroboration of an alkene occurs in ___________ which places the boron of the borane on the ___________ carbon of the doubl
Nana76 [90]

Answer: The hydroboration of an alkene occurs in TWO CONCERTED STEP which places the boron of the borane on the LESS SUBSTITUTED carbon of the double bond. The oxidizing agent then acts as a nucleophile, attacking the electrophilic BORON and resulting in the placement of a hydroxyl group on the attached carbon. Thus, the major product of the hydroboration oxidation reaction DOES NOT follow Markovnikov's rule.

Explanation:

Hydroboration is defined as the process which allows boron to attain the octet structure. This involves a two steps pathway which leads to the production of alcohol.

--> The first step: this involves the initiation of the addittion of borane to the alkene and this proceeds as a concerted reaction because bond breaking and bond formation occurs at the same time.

--> The second step: this involves the addition of boron which DOES NOT follow Markovnikov's rule( that is, Anti Markovnikov addition of Boron). This is so because the boron adds to the less substituted carbon of the alkene, which then places the hydrogen on the more substituted carbon.

Note: The Markovnikov rule in organic chemistry states that in alkene addition reactions, the electron-rich component of the reagent adds to the carbon atom with fewer hydrogen atoms bonded to it, while the electron-deficient component adds to the carbon atom with more hydrogen atoms bonded to it.

8 0
3 years ago
Please help!! The answer that shows work and does not send link will get brainiest!
Elden [556K]

Answer:

5 mol H₂. this is the answer bro all the best for your test/exam

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Which of the following results in the release of nuclear energy?
galina1969 [7]

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The breaking of nuclear bonds

Explanation:

The energy that comes from the breaking of nuclear bonds is what is called nuclear energy

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