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garik1379 [7]
3 years ago
7

Why would it be difficult to sift the iron fillings from the sand

Chemistry
1 answer:
slamgirl [31]3 years ago
5 0

Explanation:

Sand and iron fillings have the same size of particles.

It would be difficult to use a mesh to separate them. Also, sometimes , the iron filing clings well to the surface of the sand particles.

The best way to separate them is to use a bar magnet. The magnetic properties of the iron fillings will get it attracted to the bar magnet leaving the sand particles behind.

learn more:

Extraction brainly.com/question/5881840

#learnwithBrainly

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A plate moves 200 m in 10,000 years. What is its rate in cm/year?
Varvara68 [4.7K]

Answer:

The answer is

<h2>2 cm/year</h2>

Explanation:

To find the rate in cm/year we must first convert 200 m into cm

1 m = 100 cm

if 1 m = 100 cm

Then 200 m = 200 × 100 = 20 ,000 cm

So the rate is

<h2>\frac{20000}{10000}</h2>

<u>Reduce the fraction with 10,000</u>

We have the final answer as

<h3>2 cm/year</h3>

Hope this helps you

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Consider the solutions, 0.04 m urea [(NH_2)_2C=O)], 0.04 m AgNO_3 and 0.04 m CaCl_2. Which has
kaheart [24]

Answer:

Explanation:

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The Van't Hoff factor shows the number of particles into which the solute dissociates. In organic compounds we use 1, in inorganic compounds we have to think the dissociation. For example in aquous solutions, inorganic salts as AgNO₃ and CaCl₂ dissociate like this:

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AgNO₃ has 2 moles of ions and CaCl₂ has 3 moles.

In urea: i = 1

In  silver nitrate: i = 2

In calcium chloride: i = 3

The i = 3 for  calcium chloride, makes that this salt has the highest osmotic pressure, highest vapor pressure and highest boiling point.

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