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3 years ago

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Chemistry

2 answers:

ziro4ka [17]3 years ago

5 0

Answer:

They have different levels of activity in the ribosomes.

SVEN [57.7K]3 years ago

4 0

Answer: B. Mitosis produces two genetically identical daughter cells but meiosis produces four genetically different daughter cells.

Explanation:

Mitosis is the equational division in which two identical daughter cells are formed.

Mitosis does not involve crossing over of the homologous chromosomes.

It occurs in four steps which are:

Prophase

Metaphase

Anaphase

Telophase

Meiosis is reductional division in which four different daughter cells are formed.

It proceed through two cycles i.e meiosis I and meiosis II

Meiosis I contains:

Prophase I which contains:

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In the manufacturing of computer chips, cylinders of silicon are cut into thin wafers that have a mass of

german

Answer:

0.0714 mole

Explanation:

Data obtained from the question include:

Mass of Si = 2g.

The number of mole of silicon can be obtained as follow:

Molar mass of Si = 28g/mol

Mass of Si = 2g

Number of mole Si =..?

Number of mole = Mass /Molar Mass

Number of mole of Si = 2/28

Number of mole of Si = 0.0714 mole

Therefore, the number of mole of silicon in the computer chip is 0.0714 mole

3 0

4 years ago

Dissolving 5.28 g of an impure sample of calcium carbonate in hydrochloric acid produced 1.14 l of carbon dioxide at 20.0 Â°c an

kvv77 [185]

Answer:

Percentage by mass of calcium carbonate in the sample is 93.58%.

Explanation:

Assumptions:

calcium carbonate was dissolved completely and the amount of carbon dioxide released was proportional to the amount of calcium carbonate.
the sample did not contain any other compound that released or reacted with carbon dioxide.

$PV = nRT$

$n = \frac{PV}{RT}$

$P = 791 mmHg = \frac{791 mmHg}{760 mmHg} x 1 atm = 1.040789 atm.$

$R = 8.314 \frac{J}{K*mol} = 0.082 \frac{L*atm}{K*mol}$

$T = 20^{0}C + 273^{0} C = 293 K$

$n = \frac{1.040789 atm * 1.14 L}{0.082 \frac{L * atm}{K * mol} * 293 K }$

$n = 0.0493839 mol.$

given the equation of the reaction:

$CaCO_{3} + 2HCL = CaCl_{2} + CO_{2} + H_{2}O$

from assumption:

amount carbon dioxide = amount of calcium carbonate

$n(CaCO_{3} ) = n(CO_{2} )$

reacting mass ( m ) = Molar Mass ( M ) * Amount ( n )

$m(CaCO_{3} ) = n(CaCO_{3} ) * M(CaCO_{3} )$

m = 0.04938397 $mol$ * 100 $\frac{g}{mol}$ = 4.93839 $g$

percentage by mass of CaC $O_{3}$ = $\frac{mass of pure }{mass of impure}*100 = \frac{4.93839g}{5.28g}*100 = 93.5802%$ .

8 0

3 years ago

What trend in ionization do you see going up and down?

xxTIMURxx [149]

Depending if you were going up, you would be seeing an increase in relative ionization energies in a particular group on the periodic table, and vice versa, if you go down the group, an decrease in the relative ionization energies.

5 0

3 years ago

A sample of gas (24.2 g) initially at 4.00 atm was compressed from 8.00 l to 2.00 l at constant temperature. after the compressi

FinnZ [79.3K]

Answer: 16 atm
Explanation:
P1V1 = P2V2
P2 = P1V1/V2
=4 atm x 8.00 L/2.00L = 16 atm

5 0

3 years ago

The wastewater solution from a factory containing high levels of salts needs to be diluted before it can be released into the en

Vesna [10]

Answer:

3.5 atm

Explanation:

As stated in the question pressure is required to counteract the natural tendency for water to dilute the more concentrated solution. The difference in concentrations will give us the answer using the osmotic pressure equation.

π = ( n/v) RT where n/v is the molarity (mol/L), R is the gas constant and T is the temperature.

The difference in osmotic pressure of the solutions is:

Δπ = Δ c RT where c is the difference in molar concentrations.

pressure required = Δπ = (0.190 - 0.048) M x 0.821 Latm/Kmol x 298 K

= 3.47 atm

3 0

3 years ago