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3 years ago

The periodic table was developed based upon the work of which scientist?

2 answers:

8 0

Mendeleev organized and constructed the periodic table of elements. And ordered the elements into increasing atomic number.

sveticcg [70]3 years ago

5 0

C. Moosely
It is the Answer to your question.

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The use of microorganism in our day to day life is.................

Ipatiy [6.2K]

Explanation:

The use of microorganism in our day to day life is making medicine.

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2 years ago

Hydrogen boils at 20k. what is the boiling point of hydrogen on the celsius scale

Dimas [21]

Celsius scale is related to kelvin scale by the following equation,

⁰C = K-273

°C = K-273

So as here temperature is given in kelvin, so it can be converted into celsius as follows:

So 20 K = 20K-273 °C

= -253 °C .

So, the 20 K temperature equals to -253 °C.

So , -253 °C is equals to 20 K or 20 K temperature equals to -253 °C.

4 0

3 years ago

What is the mass of 13 gold atoms?

Ludmilka [50]

Answer:

uuuh 4.25191 × 10-21 grams????

Explanation:

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3 years ago

2NO + 3MnO2 + 4H â 2NO3- + 3Mn2 + 2H2O For the above redox reaction, assign oxidation numbers and use them to identify the eleme

mixer [17]

Answer:

Manganese decreases from 4+ to 2+ (reduced and oxidizing agent) and nitrogen increases from 2+ to 5+ (oxidized and reducing agent).

Explanation:

Hello there!

In this case, according to the given redox reaction, we rewrite it as a convenient first step:

$2NO + 3MnO_2 + 4H^+ \rightarrow 2NO_3^- + 3Mn^{2+} + 2H_2O$

Next, we assign the oxidation numbers as follows:

$2N^{2+}O^{2-} + 3Mn^{4+}O^{-2}_2 + 4H^+ \rightarrow 2(N^{5+}O^{2-}_3)^- + 3Mn^{2+} + 2H^+_2O^{2-}$

Thus, we can see that both manganese and nitrogen undergo a change in their oxidation number, the former decreases from 4+ to 2+ (reduced and oxidizing agent) and the latter increases from 2+ to 5+ (oxidized and reducing agent).

Regards!

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2 years ago

What is the meaning of the term polar as applied to chemical bonding?

kicyunya [14]

Polar covalent bonding is a type of chemical bond where a pair of electrons is unequally shared between two atoms.

8 0

2 years ago