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murzikaleks [220]
4 years ago
13

How do you separate iron filings toothpicks sand sugar chalk powder small pebbles

Chemistry
1 answer:
Semenov [28]4 years ago
4 0
Following strategy can be used to separate the mixture containing  sand, pebbles, iron fillings , sugar , tooth picks and chalk powder. 

Step 1: HAND PICKING: Herein, the  pebbles and tooth picks can be separated by hand-picking method.
Step 2: MAGNETIC SEPARATION: Herein, iron fillings are separated, as they are attracted towards magnet.
Step 3: Dissolution and Filtration: Water is added to sand, sugar and chalk powder. Sugar will dissolved, but sand and chalk and sand are insoluble in water. 
Step 4: Sedimentation and Decantentation: Sand will settle down in water, hence, can be removed via sedimentation and decantentation. 
Step 5: Filtration: Chalk powder is insoluble in water, hence it can be removed by filtration method.  
Step 6: Crystallization:  Sugar can be separated from solution by crystallization.
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How do you know the ph level of 10^-8
sergiy2304 [10]

pH=6.98

Explanation:

This is a very interesting question because it tests your understanding of what it means to have a dynamic equilibrium going on in solution.

As you know, pure water undergoes self-ionization to form hydronium ions, H3O+, and hydroxide anions, OH−.

2H2O(l]⇌H3O+(aq]+OH−(aq]→ very important!

At room temperature, the value of water's ionization constant, KW, is equal to 10−14. This means that you have

KW=[H3O+]⋅[OH−]=10−14

Since the concentrations of hydronium and hydroxide ions are equal for pure water, you will have

[H3O+]=√10−14=10−7M

The pH of pure water will thus be

pH=−log([H3O+])

pH=−log(10−7)=7

Now, let's assume that you're working with a 1.0-L solution of pure water and you add some 10

5 0
3 years ago
NEED HELP ASAP PLS
densk [106]

Answer:

31.60% phosphorus

Explanation:

To find the percent by mass, you first calculate the total mass and then the mass of phosphorus, and finally divide phosphorus mass by total.

Phosphorus mass: the molar mass of P is 30.97 g/mol, and since there's 1 mole of P, we just have 30.97 g.

Total mass: we add all the molar masses of the components together.

We have 3 moles of H, so we multiply 3 by 1.008 g/mol = 3.024 g H.

We already calculated the mass of phosphorus: 30.97 g P.

We have 4 moles of O, so we multiply 4 by 16.00 g/mol = 64.00 g O.

The total is then the sum: 3.024 + 30.97 + 64.00 = 97.994 g ≈ 97.99 g

Now, to find the percentage, we take 30.97 g P and divide by 97.99:

30.97/97.99 ≈ 0.3160 ⇒ 31.60% P

Thus, the answer is 31.60% phosphorus.

Hope this helps!

5 0
3 years ago
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Oxana [17]

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3 years ago
Lime is added to a lake to neutralize the effects of acid rain. The pH value of the
OverLord2011 [107]

Answer:

The change in concentration of H+ ions is -9.99×10⁻⁵

Explanation:

When pH rises, we talk about neutralization and, there is a decline in proton's concentration.

pH lower than 7 is acid

pH higher than 7 is basic

Protons are neutralized by hydroxides to make water as this:

H₃O⁺   +  OH⁻  ⇄   H₂O

pH = - log [H₃O⁺]

[H₃O⁺] = 10^-pH

In conclussion: [H₃O⁺]₁ = 10⁻⁴ → 1×10⁻⁴

[H₃O⁺]₂ = 10⁻⁷ → 1×10⁻⁷

1×10⁻⁷- 1×10⁻⁴

The change in concentration of H+ ions is -9.99×10⁻⁵

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yaroslaw [1]
Hello I took this test just now and got 100% your correct answer would be C. Hope this helps.
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3 years ago
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