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notka56 [123]
3 years ago
12

What is the relationship between synthesis and decomposition reactions?

Chemistry
1 answer:
nadezda [96]3 years ago
6 0
They are reverse processes. Synthesis is combining one or more element/compound to form a new one. e.g photosynthesis 
Decomposition is the opposite of that. It's when an element/ compound decomposes into it's component elements or simpler compounds
e.g 2H2O (l) --> 2H2 (g) + O2 (g) 
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How to writhe the balanced chemical equation
mariarad [96]
Get an equal amount of each element by adding coefficients to the different compounds.
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3 years ago
5. Which statement is true about electronegativity?
Anit [1.1K]

Answer:

Electronegativity generally increases from left to right across a period,

Explanation:

The true statement from the given choices is that electronegativity generally increases from left to right across a period.

Electronegativity is the measure of the relative tendency with which an atom of the element attract valence electrons in a chemical bond.

Across a period electronegativity increases from left to right and decreases down the group.

This is due to reduction in metallic properties as we move across the period from left to right.

3 0
2 years ago
An unknown compound contains only carbon, hydrogen, nitrogen, and oxygen. Complete combustion of a 2.77 g sample of the compound
alisha [4.7K]

The molecular formula of the unknown compound is determined as  C₉H₁₁NO₂.

<h3>Molecular formula of the compound</h3>

The molecular formula is calculated as follows;

CHNO  +  O₂ ------------> CO₂  + H₂O

Mass of carbon, C:  = (6.64 x 12)/44 = 1.81 g in 2.77 g sample

Mass of hydrogen, H: = (1.67 x 2)/18 = 0.186 g in 2.77 g sample

Mass of Nitrogen, N: = (2.77 x 0.143)/1.69 = 0.234 g

Mass of oxygen, O:  = 2.77 g - 1.81 g - 0.186 g - 0.234 g = 0.54 g

<h3>molar ratio of the elements: </h3>

C = 1.81 g = 0.15 mol

H = 0.186 g = 0.186 mol

N = 0.234 g = 0.017 mol

O = 0.54 g = 0.0337 mol

divide through with the smallest number of moles (0.017 mol);

C = 9

H = 11

N = 1

O = 2

Molecular formula = C₉H₁₁NO₂

Check the molar mass of the compound = (9 x 12) + (11 x 1) + (14) + (2 x 16) = 165 g/mol

Thus, the molecular formula of the unknown compound is determined as  C₉H₁₁NO₂.

Learn more about molecular mass here: brainly.com/question/21334167

#SPJ1

4 0
2 years ago
Suppose you take a solution and add more solvent, so that the original mass of solvent is doubled. you take this new solution an
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The molarity remais the same
3 0
3 years ago
Enter the ionic equation, including phases, for the reaction of AgNO3(aq) with K2SO4(aq).
gogolik [260]
 The answer is 
2Ag+(aq) + SO4-2(aq) → Ag2SO4(s) 

<span>NO3- and K+ ions are spectators </span>
3 0
3 years ago
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