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# Tutor profile: Karl S.

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Karl S.
Friendly and Understanding High School Teacher
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## Questions

### Subject:Chemistry

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Question:

Glucose is combined with oxygen during cell respiration to form carbon dioxide and water. Show the balanced reaction for this process and calculate the volume of carbon dioxide gas formed at standard temperature and pressure when 100g of glucose is respired.

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Karl S.

The formula for glucose is $$\text{C}_{6}\text{H}_{12}\text{O}_{6}$$, for oxygen is $$\text{O}_{2}$$, for carbon dioxide is $$\text{C}\text{O}_{2}$$, and for water is $$\text{H}_{2}\text{O}$$. The balanced equation is therefore: $$\text{C}_{6}\text{H}_{12}\text{O}_{6}$$ + 6 $$\text{O}_{2}\longrightarrow$$ 6 $$\text{C}\text{O}_{2}$$ + 6 $$\text{H}_{2}\text{O}$$ The molar mass of glucose is 180.16g/mol (this is the sum of the atomic masses of the carbon, hydrogen and water atoms in glucose). The moles of glucose is equal to the mass of glucose (100g) divided by the molar mass (180.16g/mol). 100g of glucose is therefore 0.56mol. Because one mole of glucose produces six moles of carbon dioxide (according to the balanced equation), the original 0.56 moles of glucose produce (0.56 x 6) 3.36 moles of carbon dioxide. One mole of any gas fills 22.4 liters of volume at standard temperature and pressure. The 3.36 moles of $$\text{C}\text{O}_{2}$$ therefore fill (22.4 x 3.36) 75.26 Liters.

### Subject:Basic Chemistry

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Question:

Explain the difference between the terms atom, isotope, and ion.

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Karl S.

An atom is a particle with a specific number of protons in its nucleus, and the same number of electrons in its electron shells. An isotope refers to an atom of a specific mass, that is with a specific number of neutrons. An ion is an atom with a different number of electrons than protons, which causes it to have a charge.

### Subject:Biology

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Question:

Provide an example of a single-celled organism and describe how this organism performs three of the fundamental functions of life.

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Karl S.

Paramecium is a single-celled organism. It reproduces by binary fission, it excretes wastes by diffusion, an anal pore, and a contractile vacuole. It reproduces asexually via binary fission, and it can respond to stimuli by moving through water using cilia.

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