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3 years ago

HELP ME AND PLZ ANSWERED THIS ALL RIGHT PLZ

Chemistry

1 answer:

Sunny_sXe [5.5K]3 years ago

7 0

<h2>Question no 1:</h2><h2>Answer:</h2>

The correct answer is option A which is Sarah is correct because genetic diversity occurs over a long period of time.

<h3>Explanation:</h3>

Genetic diversity is a large number of allelic combinations for a trait in specie in a population.
Genetic diversity is caused due to mutations or random breeding in a specie.
It is good for the adaptation of specie in an environment, due to diverse in genotypes and phenotype of a trait.

<h2>Question number 2:</h2><h2>Answer:</h2>

The correct answer is option B which is the species will adapt to the changes.

<h3>Explanation:</h3>

Adaptation to an environment means changing your body in such a way to reduce the harmful affects of changing the environment on the body.
For example, the long and thick fur of sheeps in a snowy area will protect them from cold.
If the environment changes, the first thing a specie do is an adaptation to that change in the environment.

<h2>Question 3.</h2><h2>Answer:</h2>

The correct answer is option D which is, "The spines of a cactus protect it from animals".

<h3>Explanation:</h3>

Adaptation to an environment means changing your body in such a way to reduce the harmful affects of changing the environment on the body.
For example, the long and thick fur of sheeps in a snowy area will protect them from cold.
So the plant of cactus was in danger due to animals. So the start growing spines in response to animals.
Hence the correct answer is option D.

<h2>Question 4.</h2><h2>Answer:</h2>

The correct answer is option B which is, "Marie's plant will lean toward the sun so that it can get the most sunlight".

<h3>Explanation:</h3>

The plant will lean towards the sun light by the mechanism of phototropism.
Phototropism is the mechanism of growth of the plant in a specific direction in the response of light.
There are two types of phototropism.
One is a positive phototropism in which plant grows towards the light.
The other is negative phototropism in which plant grows away from the light.
In this question,the plant will do positive tropism.

<h2>Question no. 5</h2><h2>Answer:</h2>

The correct answer is option B which is, "The dodo bird could not adapt quickly to the challenges of the environment".

<h3>Explanation:</h3>

Adaptation to an environment means changing your body in such a way to reduce the harmful affects of changing the environment on the body.
For example, the long and thick fur of sheeps in a snowy area will protect them from cold.
So the dodo could not adopt to the environment. For the positive adaption of survival, they should be afraid of sailors but the would not afraid of a sailor.
Due to which they went extinct.

Remaining questions are in attached document.

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An aqueous solution of ethanol, CH3CH2OH, has a concentration of 5.82 mol/L and has a density of 0.957 g/mL. What are the mass p

Ahat [919]

Answer:

1. Mass percent of ethanol = 28.02 %.

2. Mole fraction of ethanol = 0.13.

Explanation:

1. To find the mass percent we need to use the following equation:

$\%_{m/m} = \frac{m_{e}}{m_{s}} \times 100$

Where:

$m_{e}$ is the mass of ethanol

$m_{s}$ is the mass of the solution

We need to calculate the mass of ethanol and the mass of the solution:

$d = \frac{m_{s}}{V}$

Where:

d: is the density of the solution = 0.957 g/mL

V: is the volume = 1 L

$m_{s} = d*V = 0.957 \frac{g}{mL}*\frac{1000 mL}{1 L}*1 L = 957 g$

Now, from the concentration we can find the mass of ethanol:

$C = \frac{n_{e}}{V} = \frac{m_{e}}{M_{e}*V}$

Where:

$M_{e}$ : is the molar mass of ethanol = 46.07 g/mol

$n_{e}$ : is the number of moles of ethanol = m/M

$m_{e} = C*M*V = 5.82 \frac{mol}{L}*46.07 \frac{g}{mol}*1 L = 268.13 g$

Finally, the mass percent of ethanol is:

$\%_{m/m} = \frac{268.13 g}{957 g} \times 100 = 28.02 \%$

2. The mole fraction of ethanol is given by:

$\chi_{e} = \frac{n_{e}}{n_{s}}$

The number of moles of ethanol is:

$n_{e} = \frac{m_{e}}{M_{e}} = \frac{268.13 g}{46.07 g/mol} = 5.82 moles$

And the moles of the solution is:

$n_{s} = n_{e} + n_{w}$

Where w is for water

$n_{s} = n_{e} + \frac{m_{w}}{M_{w}}$

$n_{s} = n_{e} + \frac{m_{s} - m_{e}}{M_{w}}$

$n_{s} = 5.82 moles + \frac{957 g - 268.13 g}{18 g/mol} = 44.09 moles$

Hence, the mole fraction of ethanol is:

$\chi_{e} =\frac{5.82 moles}{44.09 moles}=0.13$

I hope it helps you!

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