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Tutor profile: Danielle O.

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Danielle O.
Chemistry Tutor
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Questions

Subject: Chemistry

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Question:

Calculate the formula weight of Sucrose C12H22O11 and calcium nitrate Ca(NO3)2?

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Danielle O.
Answer:

By adding the atomic weights of the atoms in sucrose we find the formula weight to be 342 amu 12 C atoms = 12 (12.0 amu) 22 H atoms= 22(1.0 amu) 11 O atoms= 11(6.0 amu) For Ca(NO3)2: 1 Ca atom= 1(40.1 amu) 2 N atoms= 2( 14.0 amu) 6 O atoms= 6(16.o amu) Adding these values together yield 164.1 amu.

Subject: Biochemistry

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Question:

What is the fate of pyruvate?

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Danielle O.
Answer:

Glucose is broken down to 2 pyruvate----> Under anaerobic conditions 2 Ethanol+ 2CO2 is formed along with 2 Lactate Under aerobic conditions: 2 Acetyl-CoA ----> this goes through the citric acid cycle and produces 4CO2+4H2O

Subject: Basic Chemistry

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Question:

Arrange the atoms Ne, Na, P, Ar, K in order of increasing first ionization energy.

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Danielle O.
Answer:

To rank these elements in order of increasing first ionization energy we need to first locate them on the periodic table. Ionization energy increases from left to right and and decrease as we go down a group. Because Na, P, and Ar are in the same period we can expect their Ionization energies to follow the trend Na < P < Ar. Ne is above Ar in group 8A we expect Ar < Ne. Similarly, K is directly below Na in group 1A and we can also expect K < Na From these observations we can conclude that the ionization energies follow the order K < Na < P < Ar < Ne

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