1,708 Answered Questions for the topic biochemistry

Biochemistry Comprehensive Science

03/07/19

Which of the following protects the spinal cord? a. sensory neurons. b. interneurons. c. vertebrae. d. none of the above.
Divisions of the Nervous System
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03/07/19

Which part of the cerebrum is associated with hearing and memory? a. Spinal cord c. Frontal lobe b. Temporal lobes d. Cerebellum
Divisions of the Nervous System
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Biochemistry

03/03/19

Calculate the volume of solute needed to make 750.0mL of 3.7% (w/v) sodium lactate solution?
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02/27/19

NH3 has a pKb of 4.74. What is the pH of a 3.2 x 10-4 mol L-1 NH3 solution?
I did this question 4 times and got it wrong, I keep getting 13 but the correct answer is 9.83, can someone please explain this to me?
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02/17/19

What type of reactions can CH3CH2NH+OH undergo?
Please Help! i don't know how to answer thisWhat type of reactions can CH3CH2NH+OH undergo?
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02/17/19

What type of reactions can CH3-CH2-O-CH=O undergo?
What type of reactions can CH3-CH2-O-CH=O undergo?Ive been stuck on this question for a few days now, I would really appreciate some help!
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Biochemistry Chemistry Maths

02/13/19

Include all the quantities required, concisely describe how you would make 50mL of a 0.5% (w/v) solution of BSA (molecular weight: 66 400) using water as a diluent
Include all the quantities required, concisely describe how you would make 50mL of a 0.5% (w/v) solution of BSA (molecular weight: 66 400) using water as a diluent
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Biochemistry Biology Chemistry

02/13/19

Predicting the concentration without doing any calculations

I’m very confused on this question.5 marksYou and Noel, your lab partner, had used the Beer-Lambert Law to calculate the concentration of light-absorbing solute, knowing its molar extinction... more
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Biochemistry Biology

02/11/19

The two individual strands of a double helix of DNA are held together by (note: adenine = A; cytosine = C; thymine = T; guanine = G)
A. Two hydrogen bonds between A and T, and three hydrogen bonds between C and GB. Three hydrogen bonds between A and C, and three hydrogen bonds between T and GC. Two hydrogen bonds between A and... more
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12/19/18

How do I memorize a whole chemistry book for a big test?
I am studying in high school to be a doctor.Now I have lots of big tests for every subject I have, but my main concern is the big chemistry test in five months, which will set my last grade for the... more
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Biochemistry Organic Chemistry Chem

12/10/18

C12H22O11(aq)+H2O(g)->4C2H5OH(l)+4CO2(g) Find the theoretical yield and the percent yields of ethanol if 680.g sucrose undergoes fermentation and 303.5g ethanol is obtained.
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12/09/18

Chemistry Homework Help
An NaoH solution was prepared by diluting 3.00 mL of a 20.0 M NaOH stock solution to a final volume of 500 mL. What is the molarity of the new solution?
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12/05/18

CHEMISTRY QUESTION

I've tried this question again and again but my solution is incorrect... can someone pls help me?What amount of thermal energy (in kJ) is required to convert 40.7 g of ethanol at -158 °C completely... more
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11/30/18

Equilibrium help

the reactions for 1 and 2 below, take place at 20°C, and answer the following questions.1) H​2S​ O​3(​ g) ⟶ SO​2(​ g) + H​2​O(g) △Go​ ​ = +25kJ mol-​ 12) H​2(​ g) + Cl​2(​ g) ⟶ 2 HCl(g) △Go​ ​ =... more
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11/30/18

What is the molecular geometry and why?

XeCl​2​ , ICl​3​ , TeF​4​ , PCl​5what is the molecular geometry of these and why
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11/28/18

I need help on finding the initial equilibrium concentrations

A+2B=3cthe reaction mixture is samples prior to the equilibrium being reached. It is determined that the reaction must proceed to the left for equilibrium to be reached. When the reaction mixer is... more
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11/28/18

How to find initial concentration
A+2B=3cthe reaction mixture is samples prior to the equilibrium being reached. It is determined that the reaction must proceed to the left for equilibrium to be reached. When the reaction mixer is... more
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11/28/18

What is the equilibrium constant

A + 2B =3C if the equilibrium concentrations are A=0.413M B=0.414M C= 0.228. What is the equilibrium constant
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Biochemistry Chemistry

11/28/18

Ph of hcl using molarity

HCl has a concentration of 4.0x10-3mol L-1 what is the pH of this
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Biochemistry Chemistry

11/28/18

Ph question acid dissociation

The acid dissociation of CH3COOH is 1.74x 10-5mol L-1 use this to find the ph of 0.25mol L-1
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11/28/18

Rate question of decomposition

Decomposition of H2O2 was observed for several days. Initially the H2O2 was present at 0.50mol L-1 after 2 days the H2O2 was 0.25mol L-1 what is the rate of this reaction
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11/28/18

Entropy change question help
N2+3H2=2NH3 is an equilibrium reaction and is 7.07x10-4 mol L-1 at 623k.given that the enthalpy of the reaction is -92kjmole-1 what is the entropy change at this temperature. Note R= 8.134J k-1mol-1
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11/25/18

I've a problem with ranking compounds
thank you for taking some time for this, these two questions i dont get:arrange the following bonds in order of polarity, from the least polar to the most polar: H-H, O-H, Cl-H, S-H, and F-HRank... more
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11/22/18

What changed rate of reaction?
. Which of the following changes is likely to ​DECREASE​​ the rate of a reaction?A. increasing the activation energyB. increasing the concentration of reactants C. increasing the temperatureD.... more
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11/22/18

Equilibrium constant

Consider the reactions 5a and 5b, below, taking place at 25 °C, and answer the following questions.5a H​2S​ O​3(​ g) ⟶ SO​2(​ g) + H​2​O(g) △Go​ ​ = +10 kJ mol-​ 15b H​2(​ g) + Cl​2(​ g) ⟶ 2 HCl(g)... more
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