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Damm [24]
4 years ago
5

A______ is scientific knowledge established through direct observation and remains constant. Scientific knowledge can change whe

n scientists______ .
Chemistry
1 answer:
Firdavs [7]4 years ago
4 0

Answer:hypothesis and conduct experiment

Explanation:

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Boron has an average atomic mass of 10.81. One isotope of boron has a mass of 10.012938 and a relative abundance of 19.80 percen
Georgia [21]
The average atomic mass is calculated by the expression:

Average atomic mass = Σzₓ(Aₓ)

where zₓ is the relative abundance of an isotope and Aₓ is the atomic mass of the isotope. 

We calculate the mass of the isotope as follows:

10.81 = .1980 (10.012938) + .8020 (x)
x = 11.00 -----------> mass of the isotope

8 0
3 years ago
Read 2 more answers
The reaction of 2,2-dimethyl-1-piopanol with HBr is very slow and gives 2-bromo- 2-methyIbutane as the major product. Give a mec
Elza [17]

Answer:

Correct option : "The mechanism results in a carbocation rearrangement in which a methyl shift occurs"

Explanation:

In the first step, 2,2-dimethyl-1-propanol gets protonated.

In the second step, a carbocationic intermediate is produced from removal of H_{2}O.

In the third step, shifting of methyl group occurs to produce more stable carbocationic intermediate.

In the fourth step, Br^{-} attacks the stable carbocation to produce 2-bromo-2-methylbutane.

So, correct option : "The mechanism results in a carbocation rearrangement in which a methyl shift occurs"

Full reaction mechanism has been shown below.

3 0
4 years ago
Define Oxidation number. Find the Oxidation number of Carbon in CO2
pentagon [3]
Look here , good luck

6 0
3 years ago
Burning wood and fossil fuels increases______ in the atmosphere.
harkovskaia [24]

⭐Hey User_____________

⭐Here IS YOUR Answer...!!!

____________________

⭐Environmental Chemistry

↪The combustion reaction as follows ..

↪CH4 + 2O2 ---> CO2 + 2H2O

↪Thus the

↪Burning wood and fossil fuels increases Carbon Dioxide in yhe atmosphere.

8 0
4 years ago
A student needs to prepare 250 mL of a 0.400 M aqueous solution of sucrose, C 12 H 22 O 11 ( aq ) , which is used frequently in
poizon [28]

Answer:

250mL volumetric flask

Explanation:

A beaker is a cylindrical glass or plastic vessel used for holding liquids. Its principal use is not measuring volumes with accuracy

An erlenmeyer flask is used to mixing or stirring solutions, is not used to measure volumes.

A volumetric flask is a glass instrument used in lab that is <em>calibrated to contain a precise volume at a certain temperature. </em>

That means if you want to make a solution with accuracy you must use a <em>250mL volumetric flask</em>.

I hope it hepls!

4 0
4 years ago
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