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Deffense [45]
2 years ago
7

30 points! pls help me! (question is in image) explanation needed!!!

Chemistry
2 answers:
ludmilkaskok [199]2 years ago
7 0

Answer:

i think biosphere is any living thing animal or plant and hydrosphere is water on earth.

Margaret [11]2 years ago
7 0

Answer:

question 4 ka lithosphere

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How many moles are present in 356.4 g of NiBr3
lozanna [386]

1.194 mol

(remember to use sig figs!)

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2 years ago
Balancing oxidation-reduction reactions <br> Mg+ N2—&gt;Mg3N2
BartSMP [9]

Answer:

{ \sf{3Mg_{(s)} + N_{2(g)} →Mg _{3}N_{2(s)}}}

3 0
2 years ago
Which sentences describe decomposers in a food chain?
Elan Coil [88]

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hey are the final link in the energy flow in a food chain or a food web. They are fungi and animals that feed on dead organic mattet.

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5 0
2 years ago
You need to produce a buffer solution that has a pH of 5.50. You already have a solution that contains 10 mmol (millimoles) of a
balandron [24]

Answer:

56.9 mmoles of acetate are required in this buffer

Explanation:

To solve this, we can think in the Henderson Hasselbach equation:

pH = pKa + log ([CH₃COO⁻] / [CH₃COOH])

To make the buffer we know:

CH₃COOH  +  H₂O  ⇄   CH₃COO⁻  +  H₃O⁺     Ka

We know that Ka from acetic acid is: 1.8×10⁻⁵

pKa = - log Ka

pKa = 4.74

We replace data:

5.5 = 4.74 + log ([acetate] / 10 mmol)

5.5 - 4.74 = log ([acetate] / 10 mmol)

0.755 = log ([acetate] / 10 mmol)

10⁰'⁷⁵⁵ = ([acetate] / 10 mmol)

5.69 = ([acetate] / 10 mmol)

5.69 . 10 = [acetate] → 56.9 mmoles

6 0
3 years ago
A reef that surrounds a volcanic island is an
quester [9]

Answer:

atoll

Explanation: this is correct, pls give me brainliest

6 0
2 years ago
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