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OverLord2011 [107]
2 years ago
10

Which two body systems are most important in breaking down food and distributing nutrients throughout the body?

Chemistry
1 answer:
andrey2020 [161]2 years ago
7 0

Answer:

hope you like and pls follow me

Explanation:

digestive and circulatory system are most important in breaking down food and distributing nutrients throughout the body.

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How many grams of kbr must be dissolved to make 25.0 ml of a solution that has a molarity of 0.85 m?
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Molarity is defined as the number of moles of solute in 1 L of solution 
molarity of solution to be prepared is 0.85 M
this means that there should be 0.85 mol of KBr in 1 L of solution 
if 1 L contains - 0.85 mol
then 25.0 mL should contain - 0.85 mol / 1000 mL x 25.0 mL = 0.0213 mol 
mass of KBr - 0.0213 mol x 119 g/mol = 2.53 g
mass of KBr that should be dissolved in 25.0 mL is 2.53 g

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The molecule described in the question has the form AEX2. Two substituents and one lone pair form three electron domains around the central atom. The expected geometry is trigonal planar but the observed molecular geometry is bent because of the lone pairs present.

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