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svetlana [45]
3 years ago
15

Please anyone help please I will pray for you

Chemistry
1 answer:
torisob [31]3 years ago
5 0

Answer:

-pneumonoultramicroscopicsilicovolcanoconiosis

-pneumonoultramicroscopicsilicovolcanoconiosis

Explanation:

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This unbalanced equation represents a chemical reaction:
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2

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Pb(NO3)2 + 2NaI 2NaNO3 + PbI2

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Consider the following reaction:
RUDIKE [14]

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H+  + Cl-         +    OH-     +     Ca2+     -> Na+   +  Cl-    +   H2O

Explanation:

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Which disease is caused when white blood cells are produced in excess?
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it can cause blood cancer (leukemia)

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3 years ago
The Swedish chemist Karl Wilhellm was the first to produce chlorine in the lab
KiRa [710]

Answer:

Explanation:

Remark

Interesting que8stion. You have to figure out how many mols are present in each reactant. Since all periodic tables are different, I'm going to use rounded numbers. If it is too close, I will go further.

NaCl

Na = 23

Cl = 35.5

1 mol = 58.5 grams

given = 50.0 grams

Mols for the reaction = 50/58.5 = 0.855

H2SO4

H2       =    2*1        2

S          =   1 * 32   32

O4       =   4*16     64

1 mol  =               98   grams

mols  present = 50/98 = 0.510

MnO2

Mn     = 1 * 55    = 55

O2   =   2*16      = 32

1 mol =                  87 grams

mols available    = 50/87 = 0.5747

Discussion

Na Cl and H2SO4 both require 2 moles for every mol of Cl2 produces.

H2SO4  has 0.51 mols available for a reaction

NaCl has  0.855 moles available for a reaction

MnO2 has 0.575 moles available for a reaction.

Given those numbers 0.510 mols of H2SO4 will only produce 0.255 mols of chlorine and the rest will be reduced in a similar manner. H2SO4 is the limiting reagent (reactant).

In other words only 0.510 moles of NaCl will be used and 0.855 - 0.510 moles will be left over on the reactants side.

only 0.575 moles of MnO2 will be used and 0.065 moles will be left over.

The oddity in the result shows up because the balance numbers in the equation give a ratio of 2 to 1 for H2SO4 and NaCl The 2 belongs to the reactants and the 1 for the chlorine.

6 0
2 years ago
Whoever good at science please help Which impact is the greatest negative of a new hydroelectric dam? A. air pollution B. change
butalik [34]
Hello!

The greatest negative impact of a new hydroelectric dam is the changes in the surrounding landscape.

Hydroelectric dams are among the cleanest energy sources, they don't generate waste, pollutants or atmospheric emissions. The negative impact is given by the landscape transformation needed to take advantage of the natural conditions of the dam. They stand out wherever they are, so it is important to consider the aesthetic aspect when building a dam. 

Have a nice day! 
7 0
3 years ago
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