Chemistry+Revision

Chemistry Revision: Practice Short Answer responses here

Solid NaOH is unsuitable as a primary standard in volumetric analysis. i. Explain the meaning of the term "primary standard". //Insert response here// ii. Suggest why solid NaOH is not suitable for use as a primary standard. //Insert response here// iii. Prior to the experiment, the concentration of the NaOH was experimentally determined by titrating the NaOH against a standard solution of HC1. Suppose about 10ml of the HC1 were spilt on the floor during the experiment. How would you safely neutralise the spill? //Insert response here
 * Question: 1+1+1=3 marks**

Consider the following paragraph. Australian scientists in the forefront of medical research Much research is taking place in Australia into the fi eld of Proteomics. Proteomics is the large scale study of the proteins present in a living organism. The DNA of a cell provides the blueprint for the assembly of the primary structure of proteins, the large biomolecules essential to life. In humans, at any one time, there may be as many as 1 000 000 different proteins and it is those proteins that do all the real work such as providing structure to skin, digesting food and fi ghting infections. So signifi cant is the role of proteins in living things that considerable resources are invested into identifying proteins as markers for disease.// i. What is meant by the term "Markers for disease" in the above paragraph? ii. How does the primary structure of a protein differ from its secondary structure?