2 years ago

What method is used by the cell to rid itself of more sodium?.

2 answers:

6 0

Answer:

Exocytosis helps the cell rid itself of wastes. The sodium-potassium pump requires energy to move ions across the cell membrane. Diffusion is an active process that requires a cell to expend a great deal of energy. I think

Reika [66]2 years ago

6 0

I’m probably wrong but I think it’s the sodium-potassium pump.

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What two gases make up 99% of the Earth's atmosphere? A. Nitrogen and water vapor B. Carbon dioxide and oxygen C. Carbon dioxide

denpristay [2]

Of the gases listed, nitrogen, oxygen, water vapor, carbon dioxide, methane, nitrous oxide, and ozone are extremely important to the health of the Earth's biosphere. The table indicates that nitrogen and oxygen are the main components of the atmosphere by volume.

so the answer is D. Nitrogen and oxygen

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6 0

2 years ago

How many moles of H2O form when 4.5 moles O2 reacts?

mart [117]

Explanation:

Start with a balanced equation.

2H2 + O2 → 2H2O

Assuming that H2 is in excess, multiply the given moles H2O by the mole ratio between O2 and H2O in the balanced equation so that moles H2O cancel.

5 mol H2O × (1 mol O2/2 mol H2O) = 2.5 mol O2

Answer: 2.5 mol O2 are needed to make 5 mol H2O, assuming H2 is in excess.