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erastovalidia [21]
3 years ago
5

Which of the following is not balanced?

Chemistry
1 answer:
White raven [17]3 years ago
7 0
Is it asking which is or isn’t balanced
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Which of the following atoms will not react with water​
Sati [7]

Answer:

Among Na ,K , Pb , Li , The atom which does not react with water is :

<u>Pb</u>

Explanation:

Li  : Reacts slowly with water

Na ,K  : Reacts vigorously with water

Pb : It does not reacts with water because :- Pb oxidize in presence of  atmospheric oxygen to form lead oxide (PbO) . this PbO form a layer over the surface of Pb and make it inert to water.

3 0
3 years ago
The standard entropy of Pb(s) at 298.15 K is 64.80 J K–1 mol–1. Assume that the heat capacity of Pb(s) is given by: CP,m(Pb, s)
aalyn [17]

Answer:

s_{Pb(l),500\°C}=100.83\frac{J}{mol*K}

Explanation:

Hello,

In this case, for the calculation of the standard entropy of liquid lead at 500 °C (773.15 K), starting by solid lead 298.15 K we need to consider three processes:

1. Heating of solid lead at 298.15 K to 600.55 K (melting point).

2. Melting of solid lead to liquid lead.

3. Heating of liquid lead at 600.55 K (melting point) to 773.15 K.

Which can be written in terms of entropy by:

s_{Pb(l),500\°C}=s_{Pb(s),298.15K}+s_1+s_2+s_3

Whereas each entropy is computed as follows:

s_1=\int\limits^{600.55K}_{298.15K} {\frac{22.13 + 0.01172 T  + 1.00 x 10^{-5} T^2}{T} } \, dT =20.4\frac{J}{mol*K}\\\\\\s_2=\frac{4770\frac{J}{mol} }{600.55K}= 7.94\frac{J}{mol*K}\\\\\\s_3=\int\limits^{773.15K}_{600.55K} {\frac{32.51-0.00301T}{T} } \, dT=7.69\frac{J}{mol*K}

Therefore, the standard entropy of liquid lead at 500 °C turns out:

s_{Pb(l),500\°C}=64.80+20.4+7.94+7.69\\\\s_{Pb(l),500\°C}=100.83\frac{J}{mol*K}

Best regards.

6 0
3 years ago
Pyridoxine contains 11 hydrogen atoms, 8 carbon atoms, 3 oxygen atoms, and 1 nitrogen atom. what is the chemical formula for pyr
FinnZ [79.3K]
Pyridoxine contains 11 hydrogen atoms, 8 carbon atoms, 3 oxygen atoms, and 1 nitrogen atom. The chemical formula would be C8H11NO3. A chemical formula of a substance tells the number of atoms of the elements that is involved in the compound. Pyrodoxine is commonly known as vitamin B6. It is mostly found in food like meat, whole grains, nuts and avocados. Also, it is can be present in dietary supplements. It has a number of important functions in the body. Dietary supplements are manufactured to prevent vitamin B6 deficiency. Also, it is used in treating a specific type of anemia or the lack of red blood cells. 
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3 years ago
What subatomic particle gives off visible light when it drops back down to a lower energy state?
Black_prince [1.1K]
The subatomic particle that gives off visible light is electrons
4 0
4 years ago
What best describes a mixture?
VashaNatasha [74]

Answer:

A mixture is a combination of two or more substances in which the identities of substances are retained.

Explanation:

sorry if i'm wrong

4 0
3 years ago
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