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3 years ago

Where does energy go during endothermic and exothermic reactions?

Chemistry

1 answer:

ra1l [238]3 years ago

7 0

It lecterns fries that is the answer.

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What will happen to a blood cell that is placed in a solution with a greater concentration of solutes?

larisa [96]

<span>Eventually the increase in water may cause the blood cells to burst (cytolysis.) In a hypertonic solution, the concentration of dissolved solutes is greater than that of the cell. ... If the salt solution outside is 20% salt, then the water concentration is 80%. The red blood cells will shrink in size due to osmotic-like pressure differences until it reaches a "favorable" size.</span>

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4 years ago

Why does sodium carbonate affect pH?

Varvara68 [4.7K]

Carbonate compounds have a negative valency (because they contain oxygen), so NaCO3 has a negative valency (it’s a negatively-charged ion) which makes it basic or alkaline.

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4 years ago

A mixture of CO2 and Kr weighs 31.7 g and exerts a pressure of 0.665 atm in its container. Since Kr is expensive, you wish to re

elena-s [515]

Answer:

11.94 grams of carbon dioxide were originally present.

19.94 grams of krypton can you recover.

Explanation:

Mass of carbon dioxide gas = x

Mass of krypton gas = y

x + y = 31.7 g

Moles of carbon dioxide gas = $n_1=\frac{x}{44 g/mol}=$

Moles of krypton gas = $n_2=\frac{y}{84 g/mol}=$

Mole fraction of krpton = $\chi '$

Total pressure of the mixture = P = 0.665 atm

Partial pressure of carbon dioxide gas = p

Partial pressure of krypton gas before removal of carbon dioxide gas = p'

Partial pressure of krypton gas after removal of carbon dioxide gas = p'' = 0.309 atm

p' = p'' = 0.309 atm

0.665 atm = p + 0.309 atm

p = 0.665 atm - 0.306 atm = 0.359 atm

Partial pressure of krypton can also be given by :

$p'=P\times \chi '$

$0.309 atm=0.665 atm\times \frac{n_2}{n_1+n_2}$

$0.309 atm=0.665 atm\times \frac{\frac{y}{84}}{\frac{x}{44}+\frac{y}{84}}$

$0.4645=\frac{\frac{y}{84}}{\frac{x}{44}+\frac{y}{84}}$ ..[2]

Solving [1] and [2]:

x = 11.94 g

y = 19.76 g

11.94 grams of carbon dioxide were originally present.

19.94 grams of krypton can you recover.

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4 years ago

If you were looking for transport proteins, where would you find them?

noname [10]

Answer:Transport proteins are found within the membrane itself, where they form a channel, or a carrying mechanism, to allow their substrate to pass from one side to the other.

Explanation:

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3 years ago

(?)Na2HPO4 → (?)Na4P2O7 + (?)H2O

Akimi4 [234]

Answer: 2,1,1

Explanation: (2)Na2HPO4=(1)Na4P2O7+(1)H20

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4 years ago