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Travka [436]
3 years ago
7

Why organic compounds recrystallized when produced​

Chemistry
1 answer:
vazorg [7]3 years ago
6 0

Answer:

An impure compound is dissolved (the impurities must also be soluble in the solvent), to prepare a highly concentrated solution at a high temperature. ... The impure substance will crystallize in a purer form because the impurities won't crystallize yet, therefore leaving the impurities behind in the solution

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you can work a total of no more than 20 hours per week at you two jobs. Baby-sitting pays $5 per hour,and your job as a cashier
Dovator [93]
Where x represents the number of hours working as a babysitter and y represents the number of hours working as a cashier...

5x + 6y <u><</u> 90
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3 years ago
Which of these best matches a planet in the solar system with its characteristic?
Lera25 [3.4K]

Uranus. Its axis is tilted to almost 90 degrees.

6 0
3 years ago
Read 2 more answers
A group of students removed the plastic insulation around a wire. They wrapped the uninsulated wire around a steel rivet 50 time
maksim [4K]

Answer:

d. add another d-cell to the circuit

Explanation:

To make the electromagnet pick something, the student should add another d-cell to the circuit.

Simply, the electromagnet set up is generating very weak magnetic fields.

  • To produce an electromagnet, there must be an interaction between electric fields an conductor.
  • As the wire turns around in the vicinity of the electric field, it induces magnetism.
  • The number of turns of wire here is pretty considerable.
  • But the electric field is very weak.
  • Additional d-cell in the circuit will circumvent this problem
8 0
2 years ago
Iron is element number 26. This means that it has?​
Amanda [17]

Answer:

Explanation:

iron is element number 26 this means that it has 26 number of electron and proton in its atomic structure so its atomic number is 26

5 0
3 years ago
#15 fill in the following table regarding ions
Natasha_Volkova [10]

Answer:

P^{3-}         Anion      Gained 3         18          

Sr^{2+}       Cation      Lost    2          36

Fe^{3+}       Cation     Lost    3          23

Explanation:

Looking at the ionic notation, the negative symbol (-) indicates that there are more electrons than protons and the positive symbol (+) indicates that there are more protons than electrons.

The number tells you how many was gained or lost.

To determine how many electrons are left, you base this off how many protons there are. The number of protons in an atom is expressed by the atomic number. In a stable atom, you have an equal number of protons and electrons.

Ions occur when electrons are gained or lost.

A cation is positively charged because it LOST an electron. Since there are more protons than electrons, the charge would be positive.

An anion is negatively charged because it gained an electron. Since there are more electrons than protons, the charge would be negative.

Using the explanation above, you can see how the answers were obtained. As for the last column, just use basic math to do this.

The atomic number of Phosphorus (P) is 15, so this means that there are 15 protons. Since it gained 3 electrons, just add 3 to 15:

15 + 3 = 18

Sr has an atomic number 38. Since it lost 2 electrons, just subtract 2 from the atomic number.

38-2 = 36

Fe has an atomic number 26. It lost 3 electrons, so we subtract again.

26-3 = 23

7 0
3 years ago
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