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tiny-mole [99]
3 years ago
9

Metals like potassium and sodium are kept in paroffin oil. Why?​

Chemistry
1 answer:
anzhelika [568]3 years ago
7 0

Answer:

because they are high reactive to the air thats why we keep them in paroffin oil

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g Ammonium nitrate was the oxidizing agent used that damaged the New York World Trade Center in 1993 and the Federal Building in
Cloud [144]

Answer:  51.3\times 10^3 kJ

Explanation:

The thermochemical equation for decomposition of ammonium nitrate is:

NH_4NO_3(s)\rightarrow N_2O(g)+2H_2O(g)   \Delta H=-82.1kJ

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Given mass= 50.0 kg =50.0\times 10^3g   (1kg=1000g)

\text{Number of moles of ammonium nitrate}=\frac{50.0\times 10^3g}{80g/mol}=0.625\times 10^3moles

According to stoichiometry:

1 mole of NH_4NO_3 gives = 82.1 kJ of heat

Thus 0.625\times 10^3moles of NH_4NO_3 give =\frac{82.1}{1}\times 0.625\times 10^3=51.3\times 10^3  kJ of heat

Thus 51.3\times 10^3 kJ of heat is evolved from the decomposition of 50.0 kg of ammonium nitrate.

7 0
3 years ago
Which element has the largest atomic radii in the 3rd period of the periodic table?
Juli2301 [7.4K]

Answer:

Sodium (Na)

Explanation:

3 0
2 years ago
The carbon atoms of acetic acid (CH3COOH) exhibit what type of hybridization?
Liula [17]

Answer:

The correct answer is D sp2 and sp3

Explanation:

Acetic acid is a weak acid containg 2 carbon atoms.the first carbon is joined to 3 hydrogen atoms by 3 covalent bonds and to the second carbo atom by one covalent bond.Therefore the first carbon of CH3COOH is sp3 hybridized.

  Whereas the second carbon is joined to the first carbon by a covalent bond,the second carbon form a double bond with oxygen and thesecond carbon forms a covalent bond with the oxygen atom of -OH group of COOH moiety.Therefore the second carbon is sp2 hybridized.

 

3 0
3 years ago
citric acid has an acid dissociation constant of 8.4 x 10^-4 it would be most effective for preparation of a buffer with a pH of
Sloan [31]

Answer:

(B) 3

Explanation:

Citric acid has an acid dissociation constant (Ka) of 8.4 × 10⁻⁴. When it forms a buffer with its conjugate base (citrate), we can calculate the pH using the Henderson-Hasselbalch's equation.

pH=pKa+log\frac{[base]}{[acid]}

The optimum range of pH is pKa ± 1. The pKa is -log Ka = -log (8.4 × 10⁻⁴) = 3.1. The buffer would be more effective for pH between 2.1 and 4.1, especially around 3.1. So the best choice is (B) 3.

5 0
2 years ago
A proton and an electron in a hydrogen atom are separated on the average by about 5.3 × 10−11 m. What is the magnitude of the el
AysviL [449]

Answer:

5.10¹¹ N/C

Explanation:

As we have a proton and a neutron, we can consider that they both have the same charge, this is:

e- = e+ = |1,6x10⁻¹⁹ C| , this number is in absolute value

Then, the formula needed to calculate the magnitude of the electric field from a charged particle is:

E= kqQ/r²

Where:

K= Coulomb constant

Q= charge  

r = distance between two charges

Then:  

E= 8.99x10⁹N/C²*(1.6x10⁻¹⁹C)/(5.3x10⁻¹¹m)²

E=5.12x1011 N/C

It is important that this value is a magnitude, it does not have any sign (positive or negative), for the magnetic field

4 0
3 years ago
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