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Jenn L.
Biology/Chemistry Undergrad Tutor
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Basic Chemistry
TutorMe
Question:

How do you tell an ionic bond apart from a covalent?

Jenn L.
Answer:

Ionic bonds are unequal sharing of electrons usually between a metal and a nonmetal. The bonds between these atoms have electronegativity values that differ by more than 2 units. The bonds usually have high melting and boiling point. Covalent bonds are the sharing of electrons either partially or equally. The bonds between the atoms either have similar electronegativity values or those that differ by less than two. Covalent bonds have low melting and boiling points.

Biology
TutorMe
Question:

Explain cellular respiration.

Jenn L.
Answer:

Cellular respiration is a catabolic pathway which produces a net release of energy. The energy stored in the bonds of glucose is being broken down to produce energy in the form of ATP. The steps include: 1. Glycolysis: Breaking down glucose to 2 pyruvate (3 carbon molecule) 2. Pyruvate Oxidation: 2 Pyruvate molecules lose an e- each to acetyl coA 3. Citric Acid Cycle: Acetyl coA goes through a cycle to produce 6 NADH and 2 FADH 4. Oxidative Phosphorylation: Electron transport chain and chemiosmosis produce large sums of ATP in the end.

Algebra
TutorMe
Question:

How do you convert a parabola in standard form into vertex form such as: y = x^2 - 2x -5

Jenn L.
Answer:

The first thing we have to do is establish the equation for vertex form: Y = a (x - h)^2 + k a is given by the coefficient of the highest leading term (in this case it is x^2). a = 1. h and k are variables used to label the x and y values of the vertex, respectively. The easiest way to solve this problem if you aren't given a graph with an obvious vertex is to find h using the equation: h = -b/2a. Thus, h = -(-2)/(2*1) = 1. Remember that h is just a variable for a vertex's x value. H can be plugged into the equation given at the start of the problem to find the vertex's corresponding y value, or k. k = y = (1)^2 - (2*1) - 5 = -6 Now plug it all into the vertex form equation and you get the answer: y = 1 (x - 1)^2 -6 *note you can drop the a in this problem since it is equal to 1 and won't change the answer. *reminder the equation is (x MINUS h). Do not mix up your signs :)

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