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Alyssa R.
Biochemistry Student
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Chemistry
TutorMe
Question:

Write a balanced chemical reaction for the following scenario: C6H6 combusts in air.

Alyssa R.

The goal of this problem is to come up with a chemical equation with the same number of moles of the same type of atoms on either side of the equation. Even though the question itself is only four words long, it gives us a lot of information. For example, the word "combust" tells us that this question is going to follow the typical format for a combustion equation which is as follows: (Hydrocarbon)+(Oxygen)-->(Carbon Dioxide)+(Water) The question gives us even more valuable information by telling us that the hydrocarbon that we're going to be working with is C6H6, or benzene. So, we can substitute that into the above equation like this: C6H6+O2--->CO2+H2O We then count the number of hydrogens, carbons and oxygens on either side of the equation. On the left we have C=6, H=6, and O=2. On the right we have C=1, H=2, and O=3. I usually start by looking for common denominators between values so that it's easier to come to a balanced equation. For combustion reactions, always start by looking at either the carbons or the hydrogens. Save the oxygens for last because they are independent of other atoms on the left side of the equation, making it easier to balance them later. Your first instinct may be to put a 6 in front of the CO2 and a 3 in front of the H2O, but even though this balances out the number of C and H in the equation it leaves you with a number of O that is impossible to balance. Remember, you want to have whole numbers in front of all of each molecule. Equation with error: C6H6+O2--->6CO2+3H2O You would need to put 1/2 in front of the O2 for this to make sense, and that is not a whole number! When you run into this problem, it may be helpful to put a 2 in front of the hydrocarbon. This will then force you to double the values in front of the products (right side of the reaction), allowing you to put a whole number in front of the O2. Your final balanced equation should look something like this---> 2C6H6+15O2--->12CO2+6H2O

Basic Chemistry
TutorMe
Question:

What is the nucleus of an atom made up of?

Alyssa R.

It is made of protons and neutrons. Protons and neutrons have exactly the same charge, but the charges are opposite, attracting them to one another.

Biology
TutorMe
Question:

How are prokaryotic cells different from eukaryotic cells?

Alyssa R.

The main difference is in their organelles- the smaller, specific components of the cell. Eukaryotic cells have membrane bound organelles and a membrane bound nucleus. This keeps all of the genetic material of the eukaryotic cell in one place. Prokaryotic cells don't have membrane bound organelles. Instead, their genetic material can be found throughout the cytoplasm. Though most of it is found in the nucleiod, a DNA rich region of the cytoplasm.

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