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3 years ago

5. Rosalind Franklin was a key figure in the discovery of the structure of DNA, yet she

Chemistry

1 answer:

andreev551 [17]3 years ago

3 0

Answer:

Explanation:

Search for "Rosalind Franklin: DNA's unsung hero - Cláudio L. Guerra" which basically summarizes what Rosalind did and how we was snubbed from receiving the noble prize even though she had vast and critical evidence to highlight the structure of DNA. You can look for more sources but I can tell you a quick recap:

Rosalind Franklin was born in an era where women scientists or workers were very uncommon and they were even discriminated and looked down upon. After her phD., she was working to find the structure of DNA and soon she was able to form an x-ray image of it. However, her lab colleague took the picture and showed it to other scientists (Watson and Crick) without the knowledge or permission of Rosalind. Here Rosalind was working on analyzing her data and on other part of world Watson and Crick were doing the same. Based on Watson and Crick's analysis, they came up with the correct structure of DNA and soon Rosalind got done as well. Both submitted their paper to journal, however, the journal placed Watson and Crick paper before Rosalind (making it look like Rosalind just confirmed what Watson and Crick proposed). This made it look like Watson and Crick were geniuses behind DNA structure whereas, in reality, it was Rosalind. She would have received Nobel Prize but she died of Cancer and Nobel prizes are not awarded to dead people.

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Which of the following is the primary force that shapes the earths landscape

lutik1710 [3]

Running water. Streams, lakes, rivers, ponds, oceans- all affect the Earth's landscape.

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3 years ago

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What does the number 18.9984 represent in the image?

Yanka [14]

The element symbol in chemistry comprises atomic number and mass number.

Atomic number is written on the top of element and mass number is written at the bottom.

For eg:

If Y is an element that is having atomic number a and mass number x. Then its denotion will be:

ᵃYₓ.

So here ⁹F₁₈.₉₉

Here 18.99 will denote mass number while 9 will denote atomic number.

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3 years ago

Let's assume you were given 2.0 g benzil, 2.2 g dibenzyl ketone, 50 mL 95% ethanol and 0.3 g potassium hydroxide to synthesize t

almond37 [142]

Answer:

the % yield is 82%

Explanation:

Given the data in the question,

we know that;

Molar mass of benzil is 210.23 g·mol−1

Molar mass of dibenzyl ketone is 210.27 g·mol−1

Molar mass of tetraphenylcyclopentadienone is 384.5 g·mol−1

Now,

2.0 g benzil = 2 g / 210.23 g·mol−1 = 0.0095 mole

2.2 g dibenzyl ketone = 2.2 / 210.27 = 0.0105 mole

3.0 g of tetraphenylcyclopentadienone = 3 / 384.5 = 0.0078 mole

Now, the limiting reagent is benzil. 0.0095 mole can reacts wiyh 0.0095 mole of dibenzyl ketone

percentage yield = ( 0.0078 mole / 0.0095 mole ) × 100%

= 0.82 × 100%

= 82%

Therefore, the % yield is 82%

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3 years ago

Which of the following processes have a ?S > 0?

Ne4ueva [31]

Answer: Cesium chloride dissolves in pure water has $\Delta S$ > 0.

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

$\Delta S$ is positive when randomness increases and $\Delta S$ is negative when randomness decreases.

a) $2HCl(g)\rightarrow H_2(g)+Cl_2(l)$

As 2 moles of gas are converting to 1 mole of gas and 1 mole of liquid, the randomness decreases and hence $\Delta S$ is negative.

b) $2NH_3(g)+CO_2(g)\rightarrow NH_2CONH_2(aq)+H_2O(l)$

As gas molecules are converting into aqueous and liquid form, the randomness decreases and hence $\Delta S$ is negative.

c) lithium fluoride forms from its elements: $2Li+F_2\rightarrow 2LiF$

As elements are combining to form a compound, the randomness decreases and hence $\Delta S$ is negative.

d) Cesium chloride dissolves in pure water : $CaCl_2(s)\rightarrow Ca^{2+}(aq)+2Cl^-(aq)$

As compound is dissociating into ions, the randomness increases and hence $\Delta S$ is positive.

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3 years ago

An aqueous solution contains the amino acid glycine (NH2CH2COOH). Assuming that the acid does not ionize in water, calculate the

zmey [24]

Answer:

Molality for this solution is 0.98 mol/kg

Explanation:

ΔT = Kf . m . i

Freezing point depression, here

ΔT = Freezing point of pure solvent - Freezing point of solution

i = Van't Hoff factor.

This solute, the amino acid glycine does not ionize, so the i in this case is 1

Let's replace the data given

0° - (-1.83°C) = 1.86 °C/m . m . 1

1.83°C = 1.86 °C/m . m . 1

1.83°C / 1.86 m/°C = 0.98 m

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3 years ago