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3 years ago

2. Can the "facts” of science change over time? If so, how

Chemistry

2 answers:

crimeas [40]3 years ago

6 0

Answer:

Yes

Explanation:

Some scientific facts are still under investigation of why it is true or not;i.e, science made us to believe that human evolution first started in the Sahara of East Africa which we don't know if it's true or not, but that's what the scientists said. And as of present days the new generations of scientists are still trying to testify if the facts are true, so it might change once their researches proved another facts differ from what we were taught.

Aleks [24]3 years ago

3 0

Definitely, the more you research into something the more information on it you’ll get, they could very well realize that with the new information their old faces were incorrect

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What is the answer? show proof I will report you if you answer for the points

IceJOKER [234]

Answer:

Explanation:

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3 years ago

A certain hydrocarbon has a molecular formula of C9H16. Which of the following is not a structural possibility for this hydrocar

snow_tiger [21]

Answer: Option (d) is the correct answer.

Explanation:

It is given that molecular formula is $C_{9}H_{16}$ . Now, we will calculate the degree of unsaturation as follows.

Degree of unsaturation = $C_{n} - \frac{\text{monovalent}}{2} + \frac{\text{trivalent}}{2} + 1$

= $9 - \frac{16}{2} + 1$

= 9 - 8 + 1

= 2

As the degree of unsaturation comes out to be 2. It means that this compound will contain one ring and one double bond.

Yes, this compound could be an alkyne as for alkyne D.B.E = 2.

But this compound cannot be a cycloalkane because for a cycloalkane D.B.E = 1 which is due to the ring only.

Thus, we can conclude that it is a cycloalkane is not a structural possibility for this hydrocarbon.

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3 years ago

what is the concentration in ppm of a solution which is prepared by dissolving in 15mg of nacl in 200ml water

bezimeni [28]

Answer:

Explanation:

In weight/volume (w/v) terms,

1 ppm = 1g m-3 = 1 mg L-1 = 1 μg mL-1

200 mL = 0.2 L

15 / 0.2 mg L-1 =75 ppm

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3 years ago

In a solution of a carbonated beverage the water is what? Solute, saturated, solvent or precipitate

Scilla [17]

Https://us-static.z-dn.net/files/d49/33d4ec86853ef95e6f6c14242c663be4.png

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Luda [366]

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If the distance between atoms is higher, lesser will be attraction between electrons and protons of atoms, smaller distance means stronger atoms attraction.

</span>

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3 years ago