An ore of lead contains 70% of PbS. Calculate the mass of lead that can be extracted from 478kg of the ore.[Ar : Pb = 207; S = 32] Answer:…

Using the table, select the correct answer from the table.Cell Quantity of nuclear DNAP 1Q 2R 0 Answer: 21) D All body cells such as red blood cells and skin…

The diagram shows three similar right-angled triangles. What is the area of the largest triangle? Answer: 20) B Let hypotenuse of smaller triangle = HLet hypotenuse of larger triangle = ALet hypotenuse of largest triangle =…

Nitrogen Monoxide is prepared by reacting copper with nitric acid. What should the values of a, b, x and y be in order to balance the following equation?aCu + bHNO3…

The genetic condition represented by the shading is caused by the presence of at least one allele for the condition.Which of the following are possible reasons why U has the…

Which of the following (A-E) correctly identifies all of the compounds from the list below that contain covalent bonds in their structure?CO2 (g) Ca(OH)2 (s) H 2SO4 (l) MgCO3 (s)…

The table below shows information relating to gas exchange in an active muscle when blood first enters that muscle.Which row of the table is correct? Answer: 13) E Read the…