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4 years ago

Why is vigorous trituration required to prepare emulsions?

1 answer:

4 0

This is done to dilute a very potent drug powder. An aliquot of the mixture contained the desired quantity of the substance at a certain amount to maintain the accuracy of the active component of the emulsion. Emulsions are mixture of two liquids that are immiscble. Fine dispersion of minute droplets can be observed in one liquid when this happens. Emulsions are part of general class with 2 phase system called colloids.

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calculate the amount of time required to rise the temperature of 0.50 liter of water from 0.0 c to 10.0 c if the energy is suppl

Ivanshal [37]

Answer:

The amount of time required to rise the temperature of 0.50 liter of water from 0.0 c to 10.0 c is 19 seconds

Explanation:

1100 J/s is the energy supplied so, we have to set, the energy to that ΔT, which is 10°C (10°-0°)

Q = m . C. ΔT

Q = 500g . 4,186J/g°C . 10°C

Remember the water density is 1g/mL, so if we have 0,5 L, we should get the convertion to g. (1ml = 1x10*-3 L)

1x10*-3 L ____ 1 g

0,5 L _____ (0,5 L . 1 g)/ 1x10*-3 L = 500g

4,186J/g°C, this value is known as specific heat of water. It is a known value.

Q = 500g . 4,186J/g°C . 10°C = 20930 J

Now the final rule of three:

1100 J supplies at _____ 1 second

20930 J supplies at _____ (20930 J . 1 s) / 1100 J =19,02 s

8 0

3 years ago

What shape has the largest area to perimeter ratio.

antiseptic1488 [7]

Circle-Thus a circle has the largest area of any closed figure with a given perimeter

8 0

3 years ago

An antacid tablet was dissolved in water and 10mL of 0.16M HCl was added. After the acid had reacted with the tablet it required

Mnenie [13.5K]

Answer:

0.0008 mole of HCl

Explanation:

From the balanced equation between HCl and NaOH:

$HCl + NaOH --> NaCl + H_2O$

1 mole of acid requires 1 mole of base for neutralization.

mole = molarity x volume

mole of NaOH = 0.02 x 0.04 = 0.0008 mole

mole HCl = 0.16 x 0.01 = 0.0016 mole

Since 1 mole of NaOH requires 1 mole of HCl for neutralization, it means that 0.0008 mole of NaOH will require 0.0008 mole of HCl. The remaining mole of HCl must have been neutralized by the antiacid:

0.0016 - 0.0008 = 0.0008 mole.

Therefore, 0.0008 mole of HCl must have been neutralized by the antiacid.

7 0

4 years ago

Of the following, which is the most concentrated solution?

jeka94

B 1.2g/mL just look at a graph and pin point those answers

8 0

4 years ago

Read 2 more answers

Which element, if combined with chlorine, will have the greatest attraction for the chlorine electrons? N P As

motikmotik

The Nitrogen (N) will have the greatest attraction for the chlorine electrons.

Answer: A) N

Explanation

The tendency or the ability to attract electrons is termed as electronegativity.

The electronegativity tend to increase from left to right in the periods and bottom to top in the groups of the periodic table. So it is known that the halogen group consists of the most electronegative elements.

Though chlorine has high electronegativity of 3.16, the electrons of chlorine can be attracted by other electronegative elements provided that their electronegativity should be in the range of the electronegativity of Cl.

So among the elements given, Nitrogen (N) has an electronegativity of 3.04, Phosphor (P) has an electronegativity of 2.19 and Arsenide electronegativity is 2.18.

Thus it can be seen that the electronegativity is maximum for Nitrogen among the three elements so it should have the greatest tendency to attract Cl electrons.

5 0

3 years ago