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Sonbull [250]
3 years ago
11

The surface tension of water is 7.28 ✕ 10−2 J/m2 at 20°C. Predict whether the surface tension of heptane would be higher or lowe

r than that of water at the same temperature. Explain your answer.

Chemistry
1 answer:
stira [4]3 years ago
3 0

Answer:

Lower  

Explanation:

Surface tension occurs because molecules at the surface do not have molecules above them, so they cohere more strongly to their neighbours.

The stronger cohesive forces make it more difficult to move an object through the surface than when it is beneath the surface.

The attractive forces in water are strong because of hydrogen bonding.

A hexane molecule is nonpolar, so the only attractions are the weak London dispersion forces.

The cohesive forces at the surface are much lower than those in water, so the surface tension of hexane is lower than that of water at the sane temperature.

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Depending upon the tip of a dropper pipet there are approximately 20 drops per milliliter of water. the experimental procedure p
Murrr4er [49]

Answer : The volume range in milliliters for the solution is 0.25 - 0.5 mL

Explanation :

We have been given that there are approximately 20 drops per milliliter of water

This information can be used as a conversion factor as \frac{1mL}{20 drops}

We are using 5-10 drops of the solution.

Let us calculate milliliters in 5 drops.

5 drops \times\frac{1 mL}{20 drops} = 0.25 mL

Similarly, 10 drops would contain

10 drops \times\frac{1 mL}{20 drops} = 0.5 mL solution.

Therefore the volume range in milliliters for the solution is 0.25 - 0.5 mL

8 0
3 years ago
Which number represents an acidic pH, 4 or 9? _______
AVprozaik [17]
The calculation of pH is based on the activity (aH) of hydrogen ions (H+) dissolved in solution. Specifically, the pH range of numbers is based on a logarithmic scale:

pH=-log (aH)

Log functions are used to rescale very large numbers (or very small numbers) into values much closer to 1. This is often done to deal with more reasonable
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The lower the number on the pH scale, the greater the concentration of hydrogen ions and the greater the material's acidity. The higher the number assigned on the pH scale, the greater the concentration of hydroxide ions and the more basic, or alkaline, the material.

The answer is 4.
8 0
3 years ago
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Drain cleaner has a pH of about 14. How can it be classified, based on its pH? A. It is a very strong base. B. It is close to ne
Anton [14]
<h3>Answer:</h3>

A. It is a very strong base.

<h3>Explanation:</h3>

To answer the question we need to ask ourselves several questions

What is pH?

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How is pH measured?

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What does pH tell about a solution?

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Answer:

C is for carbon and O is for oxygen

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