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lara31 [8.8K]
2 years ago
15

The diagram shows structures that represent different levels of organization in a human. Which is the simplest level of organiza

tion?
W
X
Y
Z

Chemistry
1 answer:
SSSSS [86.1K]2 years ago
7 0

Answer:

Yzwx

Explanation:

Y-cell

z-tissue

w- organ

x-organ system

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Which of the following is one way that nuclear reactions differ from chemical<br> reactions?
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Answer:

Nuclear reaction takes place at the nucleus whereas chemical reaction involves valence electrons

Explanation:

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You use 4.98 g of Na2SO4, how many grams of barium sulfate are produced?<br><br> Na2+Ba(NO3)2= ?
Kaylis [27]

Answer:

Mass of barium sulfate = 8.17 g

Explanation:

Given data:

Mass of sodium sulfate = 4.98 g

Mass of barium sulfate produced = ?

Solution:

Na₂SO₄ + Ba(NO₃)₂    →   BaSO₄ + 2NaNO₃

Moles of sodium sulfate:

Number of moles = mass/molar mass

Number of moles =4.98 g / 142.04 g/mol

Number of moles = 0.035 mol

Now we will compare the moles pf sodium sulfate and with barium sulfate.

                            Na₂SO₄               :            BaSO₄

                                1                       :              1

                              0.035                :          0.035

Mass of barium sulfate:

Mass = number of moles × molar mass

Mass =   0.035 mol ×233.4 g/mol

Mass = 8.17 g

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Draw the curved arrows to show the mechanism for the reaction of butanedioic (succinic) anhydride with methanol.
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Here is the mechanism of said reaction.

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