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Dmitriy789 [7]
2 years ago
12

What is vaccine (question answer)​

Chemistry
1 answer:
Ket [755]2 years ago
6 0
Above answer is correct
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Which of the following solvent pairs could be used in a solvent pair recrystallization (in general, not for this specific reacti
lilavasa [31]

Answer:

(a) Ethyl acetate and hexane, and (c) methanol and methylene chloride.

Explanation:

re-crystallization is a technique used to purify solid compound.   Ethyl acetate and hexane are good solvent pair for recrystallization because they are miscible with each other due to their good differences in polarity. ethyl acetate has polarity of 77 while hexane has 68.

water and diethyl ether are not good solvent pair for recrystallization because water and diethyl ether are immiscible. They have very far polarity values. water has 100 while diethyl ether has 35

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3 years ago
The atomic number of an atom is always equal to the number of what?
3241004551 [841]

The atomic number is always equal to the number of protons. It will be equal to the number of elections also if the atom has a neutral charge.

If you find my answer helpful, please brainliest me!

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3 years ago
Siy-epdv-fwo luna please join​
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is this a cult?im confused

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2 years ago
When monovalent cation (X) binds to divalent anion (Y) it will form
Romashka-Z-Leto [24]

When a monovalent cation X binds to a divalent anion Y, a compound with the formula X_2Y would be formed.

A monovalent cation is an atom that has lost an electron. Hence, such cation has a single positive charge. A monovalent cation X will, thus, be X^+

A divalent anion is an atom that has gained two electrons. Such anion has 2 negative charge. Thus, divalent Y would be Y^2^-

Since Y is a divalent anion, it requires 2 electrons in order to successfully bind with another charged atom, a cation to be specific. Thus, two of  X^+ would be required to successfully bind  Y^2^-

   Y^2^- + X^+ + X^+ ----> X_2Y

More on the chemical formula can be found here: brainly.com/question/16741890

8 0
2 years ago
How many significant figure does 60600 have?
irga5000 [103]
The answer would be 5. because the last zero is a holding place because the number is in front of the decimal. They other zero counts because they are being sandwiched.<span />
7 0
3 years ago
Read 2 more answers
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