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3 years ago

Identify the electronegative element in each of the molecules:

1 answer:

6 0

Electronegativity means how strongly an atom can attract electrons. The more positive charge an atom has, the better it attracts the negatively charged electrons. However, distance is a factor too, so if the nucleus (where the protons are) starts becoming too large, the strength of the positive charge isn't as large as it would otherwise be.

Basically this means that fluorine is the most electronegative element since it has the most positive charge for its relative size. Elements closer to fluorine have higher electronegativities than elements further from it on the periodic table.

so in other words F is most electro, bc it attracts more electrons to its atom making other atoms Positive

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How is ozone produced?

zubka84 [21]

The answer is A. the solar ultraviolet ray breaks the molecule apart

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3 years ago

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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

3 years ago

Some students performed a titration between 20.0 mL of 0.5 M hydrochloric acid and 1.0 M potassium hydroxide solution. The stude

RideAnS [48]

Answer:

OPTION C) All hydrogen ions and all hydroxide ions have reacted to produce water, and so neither ion remains free in solution.

Explanation:

The PH reading on the left axis of the graph shows a value of 7.

A value of 7 on the PH scale implies that equal number of hydrogen ions completely reacted with hydroxyl ions to produce water i.e there is no excess of hydrogen and hydroxyl ion remaining in solution.

For values greater than 7, a basic solution is formed and it signifies the presence of excess hydroxyl ion. If the value is less than 7, there is more hydrogen ions in the solution formed and it is said to be acidic.

At point 7, the hydrogen and hydroxyl ions are equal and completely neutralize out one another.

Note: The acid solution would require a base volume of 20mL to be completely neutralized according to the plot. If it is less, the PH shifts to the left and the solution becomes acidic. If it more, the solution becomes basic and the PH shifts rightwards.

7 0

3 years ago

Read 2 more answers

A 20 kg curling stone is sliding in a positive direction at 4 m/s. A second curling stone is sliding at the same speed but in th

solniwko [45]

Answer:

The kinetic energy of the two stones is 320 J

Explanation:

Kinetic energy is the energy that a body possesses due to its movement. So it is the capacity or work that allows an object to go from being at rest, or still, to moving at a certain speed.

In other words, the kinetic energy of an object is that which is produced due to its motion and depends on its mass and velocity as follows:

$Ec=\frac{1}{2} *m*v^{2}$

where the kinetic energy Ec is measured in joules (J), the mass m is measured in kilograms (kg) and the velocity v in meters/second (m/s).

In this case you know that a 20 kg curling stone is sliding in a positive direction at 4 m/s. So:

m= 20 kg
v= 4 m/s

Replacing you have:

$Ec_{1} =\frac{1}{2} *20 kg*(4\frac{m}{s}) ^{2}$

Ec₁= 160 J

A second curling stone slides at the same speed but in the opposite direction. So:

m= 20 kg
v= - 4 m/s

Replacing you have:

$Ec_{2} =\frac{1}{2} *20 kg*(-4\frac{m}{s}) ^{2}$

Ec₂= 160 J

The kinetic energy of the two stones is calculated as:

Ec= Ec₁ + Ec₂

Ec= 160 J + 160 J

Ec= 320 J

The kinetic energy of the two stones is 320 J

7 0

3 years ago

How do starch and ATP store and supply energy?

riadik2000 [5.3K]

Answer:

molecules store energy

Explanation:

Hope This Helps! ^^

5 0

3 years ago