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4 years ago

Which metal reacts quickly with cold water only when it is finely powdered?

Chemistry

2 answers:

scoundrel [369]4 years ago

7 0

Most likely it is magnesium

Andre45 [30]4 years ago

3 0

Magnesium is the metal that reacts quickly with water only when it is finely powdered.

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Which of the following statements concerning the sample size of an experiment is not accurate?

Ilya [14]

A I believe. :)))))))))

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3 years ago

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What would you need to do to calculate the molality of 0.2 kg of NaCl in 3 kg

enot [183]

Answer:

D. Convert the 0.2 kg of NaCl to moles of NaCl

Explanation:

The molality equation looks like this:

Molality = moles of solute / mass (kg) of solvent

In this case, the solute is NaCl and the solution is water. So, if you have been given NaCl in kg, you need to convert it to grams and then to moles in order to plug it into the equation.

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2 years ago

4. The solubility of acetanilide in hot water is 5.5 g / 100 mL at 100oC and its solubility in cold water is 0.53 g / 100 mL at

Triss [41]

Answer:

89,4%

Explanation:

If you have a solutio of 2,5g of acetanilide in 50mL of water and you warm this solution to 100°C you will dissolve all acetanilide because the maximum solubility in 50mL will be:

5,5g / 100mL → 2,75g / 50mL.

Then, if you cold the water to 0°C the solubility in 50mL will be:

0,53g / 100mL → 0,265g / 50mL.

That means you will precipitate:

2,5g - 0,265g = 2,235g of acetanilide

The theoretical percent recovery will be:

2,2365g / 2,5g ×100 = 89,4%

I hope it helps!

7 0

3 years ago

Please help me figure this out! God bless you <3

statuscvo [17]

South ????????????????????????

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3 years ago

An electron in the n=6 level of the hydrogen atom relaxes to a lower energy level, emitting light of ?=93.8nm. find the principa

Rama09 [41]

We can find the principal level or lower level using Rydberg's formula:

1/w = R(1/L² - 1/U²)

where:

w is the wavelength (93.8 nm),

L is the lower energy level (unknown)

U the upper energy level (n= 6)

R is Rydberg's constant (10,967,758 waves per meter)

Substituing known values into the equation:
1/(9.38 * 10^-8 m.) = 10,967,758(1/L² - 1-36)

Using the solver function of the calculator to get for L:

L = 0.999 
so L = 1.
The lower level is 1 (the ground state).

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4 years ago

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