Other Chemistry Answers

When is a reaction is called spontaneous ?

why is quartz suitable for use as an abrasive, involving it's structure?

What is the significance of vitamins and minerals in the living system ? Write one biochemical reaction in which the enzyme of cynocobalamine is associated and explain the mechanism of the reaction .

REPORT: Critical Analysis of the Environmental Impact of Chemical Processes

Identify a ‘human-made’ chemical process (or series of processes) that has undergone
changes in recent times to reduce its environmental impact. Critically examine and
comment on the appropriateness of the changes. Suggest other alternatives and why
they may not have been adopted.

Can you give some ideas how to start the report. or share some link regarding this question?

How does the pH effect the activity of enzymes in the biological systems ? Illustrate your answer.

Describe the stereochemistry of the peptide bond and explain how this is significant in restricting the number of conformations of a polypeptide chain.

Why are the amino acids called alpha amino acids? The amino acids tyrosine and tryptophan have nonpolar side chains ; still these are placed in the uncharged polar group why ? Write the advantages of polar side chains in the amino acids.

A gem has a mass of 4.20g . When the gem is placed in a graduated cylinder containing 20.20mL of water, the water level rises to 21.80mL .
A graduated cylinder contains 155mL of water. A 17.0g piece of iron (density = 7.86g/cm3 ) and a 25.0g piece of lead are added. What is the new water level in the cylinder?

Describe the method for fractionation of subcellular organelles .

CaCO3 + 2HCl > CaCl2 + H2O + CO2

a.) 45.0 g CaCO3 are added to 1.25 L of a 25.7% (w/v) solution of HCl. Calculate the theoretical yield of CO2 formed.

b.) Calculate the mass of CaCO3 and volume of HCl solution required to produce 25.0 g of CO2. The reaction is 78.0% efficient.