3 years ago

Which of the following is a living resource that humans use from the ocean?

Chemistry

1 answer:

ra1l [238]3 years ago

4 0

Answer:

water

Explanation:

because water keeps us alive

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For an object to sink

AfilCa [17]

Answer:

For and object to sink, it must have more density than the liquid in which it is placed. For example, if you have a glass of water and a metal spoon, the spoon will sink because it is both heavier than the water, therefore having more density.

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3 years ago

Which begins as chemical energy and can be transformed into electricity?

Umnica [9.8K]

Sunlight i think thats the answer

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3 years ago

If 45 mL of water are added to 250 mL of a 0.75 M K2SO4 solution, what will the molarity of the diluted solution be?

krok68 [10]

Answer:

$\large\boxed{\large\boxed{0.64M}}$

Explanation:

When you form a <em>diluted solution</em> from a mother (concentrated) solution, the moles of solute are determined by the mother solution.

The main equation is:

$Molarity=\dfrac{\text{moles of solute}}{\text{volume of the solution in liters}}$

Then, since the moles of solute is the same for both the mother solution and the diluted solution:

$\text{Molarity mother solution }\times\text{ volume mother solution}=\\\\=\text{Molarity diluted solution }\times\text{ volume diluted solution}$

Substitute and solve for the molarity of the diluted solution:

$250mL\times 0.75M=(45mL+250mL)\times M\\\\\\M=\dfrac{250mL\times 0.75M}{295mL}=0.64M$

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3 years ago

Select the word or phrase that best completes each of the following sentences.

harina [27]

Answer:

1. Cells

2. Molecules

3. Organ

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2 years ago

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Which of the following is NOT a unit energy? (select all that applies)

never [62]

Answer:

Kelvin, Celsius, Fahrenheit

Explanation:

See my other answer for an explanation.

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3 years ago

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