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Alex777 [14]
3 years ago
6

A note about crystallization or its definition?

Chemistry
2 answers:
Natasha_Volkova [10]3 years ago
6 0

the crystallization is a separation technique that is used to separation a solid that has dissolved in a liquid and made a solution
Mashutka [201]3 years ago
4 0
Crystallization is: A chemical of solid - liquid separation technique, in which mass transfers a solute from the liquid solution to a pure solid crystalline phase occurs. In chemical engineering crystallization occurs in a crystallizer.

Hope I helped!

- Debbie
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The following information is to be used for the next 2 questions. In order to analyze for Mg and Ca, a 24-hour urine sample was
Ainat [17]

Answer:

Explanation:

From the given information:

The concentration of metal ions are:

[Ca^{2+}]= \dfrac{0.003474 \ M \times 20.49 \ mL}{10.0 \ mL}

[Ca^{2+}]=0.007118 \ M

[Mg^2+] = \dfrac{0.003474 \ M\times (26.23  - 20.49 )mL}{10.0 \ mL}

=0.001994 \ M

Mass of Ca²⁺ in 2.00 L urine sample is:

= 2.00 L \times 0.001994 \dfrac{mol}{L} \times \dfrac{40.08 \ g}{1 \ mol}

= 0.1598 g

Mass of Ca²⁺ = 159.0 mg

Mass of Mg²⁺ in 2.00 L urine sample is:

= 2.00 L \times 0.007118 \dfrac{mol}{L} \times \dfrac{24.31 \ g}{1 \ mol}

= 0.3461 g

Mass of Mg²⁺ = 346.1 mg

5 0
3 years ago
The smallest unit of a compound is called a ___________.
Oxana [17]
<span>The smallest unit of a compound is called a molecule. The correct option among all the options that are given in the question is the second option or the penultimate option or option "B". The other choices are incorrrect and can be negated. I hope that this is the answer that has actually come to your desired help.</span>
5 0
3 years ago
An element that has 2 core electrons and 3 valence electrons
gavmur [86]

Answer:

Boron

Explanation:

You can find this by looking at the number of protons in Boron, 5.

Then calculate how many electrons you are given, in this case the 2 core plus the 3 valence equal 5 total electrons

Neutral elements have the same number of protons and electrons, so your answer would be the element with 5 electrons, Boron.

You can also know this by using electron configuration. Since you kow there are 5 electrons then you can use EC to find out where your element is. In this case it is: 1s2 2s2 2p1

6 0
2 years ago
How many of the following postulates of Dalton's atomic theory are still scientifically accepted? I. All atoms of the same eleme
Neko [114]
<h2>The required "options are (II), (III), and (IV)".</h2>

Explanation:

Postulates of Dalton's atomic theory which are scientifically accepted are:

  • Atoms are indestructible.
  • Compounds are combinations of different atoms.
  • A chemical reaction changes the way atoms are grouped together.

Postulates of Dalton's atomic theory which are not accepted scientifically are:

  • All atoms of the same elements are identical.

            The theory states that the atoms of the same element are identical in every aspect but it is now scientifically proved that the same element should differ in their mass which is known as isotopes.

5 0
3 years ago
Suppose you needed a 0.0250 M sodium thiosulfate solution to conduct 6 titrations. Explain how you would make up this solution u
AysviL [449]

Explanation:

According to the law of dilution,

       M_{1}V_{1} = M_{2}V_{2}

The given data is as follows.

   M_{1} = 0.4782,     V_{1} = ?

    M_{2} = 0.025 ,    V_{2} = 250 mL

Hence, we will calculate the value of V_{1} as follows.

              V_{1} = \frac{M_{2} \times V_{2}}{M_{1}}

                          = \frac{0.025 \times 250}{0.4782}

                          = 13.07

Thus, we can conclude that we need 13.07 mL 0.4782 M sodium thiosulfate solution using pipette.

4 0
3 years ago
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