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3 years ago

Helppp mee plz guysss

Chemistry

2 answers:

svp [43]3 years ago

7 0

Answer:

11 and a half

Explanation:

well it luks to be

Vesnalui [34]3 years ago

3 0

Answer:

11.5 cm

Explanation:

jsosne92he9dbw9wns9wne9dbe8d

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How many grams of material is lost in the aqueous phase if two extractions are carried out on 100 mL of a 5% (m/v) aqueous solut

san4es73 [151]

Answer:

4.94g of material

Explanation:

Partition coefficient (Kp) of a substance is defined as the ratio between concentration of organic solution and aqueous solution, that is:

Kp = 8 = Concentration in Ethyl acetate / Concentration in water

100mL of a 5% solution contains 5g of material in 100mL of water. Thus:

8 = X / 100mL / (5g-X) / 100mL

Where X is the amount of material in grams that comes to the organic phase.

8 = X / 100mL / (5g-X) / 100mL

8 = 100X / (500-100X)

4000 - 800X = 100X

4000 = 900X

4.44g = X

Thus, in the first extraction you will lost 4.44g of material from the aqueous phase.

And will remain 5g-4.44g = 0.56g.

In the second extraction:

8 = X / 100mL / (0.56g-X) / 100mL

8 = 100X / (56-100X)

448 - 800X = 100X

448 = 900X

0.50g = X

In the second extraction, you will extract 0.50g of material

Thus, after the two extraction you will lost:

4.44g + 0.50g = 4.94g of material

6 0

2 years ago

Which is associated with a fission reaction? *

podryga [215]

Answer: Radioactive waste

Explanation:

The nuclear fission reaction consists of heavy atomic particles or heavy nucleus, like plutonium and uranium and in radioactive heavy metals. In the fission reaction the nucleus get split into equal masses of particles. This process is associated with release of large amount of energy. The fission of radioactive waste can cause deadly mutations in living beings.

6 0

3 years ago

Write three characteristics of mandleef's periodic table?

Slav-nsk [51]

Answer:

The periodic table is composed of seven horizontal rows or periods and is numbered between 1 and 7. There is a regular gradation in the properties of elements in the horizontal rows(periods) from left to right. The periodic table is composed of eight vertical columns or groups. They are numbered between 1 to 8.

Explanation:

6 0

2 years ago

2KClO3(s) => 2KCl(s) + 3O2(g) is there an increase or decrease of entropy?

ValentinkaMS [17]

Answer:

Entropy increases

Explanation:

Entropy (S) is a measure of the degree of disorder. For a given substance - say water - across phases the following is true ...

S(ice) < S(water) << S(steam)

For a chemical process, entropy changes can be related to increasing or decreasing molar volumes of gas from reactant side of equation to product side of equation. That is ...

if molar volumes of gas increase, then entropy increases, and

if molar volumes of gas decrease, then entropy decreases.

For the reaction 2KClO₃(s) => 2KCl(s) + 3O₂(g)

molar volumes of gas => 0Vm* 0Vm 3Vm

*molar volumes (Vm) apply only to gas phase substances. Solids and liquids do not have molar volume.

Since the reaction produces 3 molar volumes of O₂(g) product vs 0 molar volumes of reactant, then the reaction is showing an increase in molar volumes of gas phase substances and its entropy is therefore increasing.

3 0

3 years ago

Fill in the blanks below using vocabulary terms-reactants, products, limiting reactant, excess reactant.

slamgirl [31]

Answer:

The vocabulary terms are in the correct order.

Explanation:

The substances that undergo chang are called reactants. They are what create the products. Reactants are on the left side of the equation while the products are on the right side of the equation. The new substances are called products. In other words, what is produced? The products are produced. The reactant that will be used up first is called a limiting reactant. Why? Because it is what limits the reaction. It determines how much products can be made. The reactant that is left over then, is called the excess reactant. That is what is left in excess and does not determine how much product is made.

7 0

3 years ago