the diagram to the right shows a plot of temperature versus time for a sample that is allowed to cool and the temperature monitored. explain the observed temperature versus time history for a liquidsolid phase boundary as the sample undergoes a temperature change from point b to point e. [7 marks]
(b) define the term "normal boiling point". [3 marks]
(c) if two phases are in equilibrium at a given p and t the relationship between ïp that we exert and ït we must make to ensure that the two phases remain in equilibrium is given by: lnp2= lnp1 - ïvaph/r (1/t2 - 1/t1) + constant: the vapour pressure of pyridine is 50.0 kpa at 365.7 k and the normal boiling point is 388.4 k. what is the enthalpy of vaporisation of pyridine? [10 marks]
d) define the term "supercritical fluid"

Write two balanced equations 1. dissolving of solid sodium hydroxide in water 2. the reaction of sodium hydroxide solution with hydrochloric acid

For a family dinner, jose’s mom baked a loaf of bread. during the meal, his grandmother commented, “this bread is so dense! ” what do you think his grandmother meant by the word dense? you have some ideas regarding density already, but this experiment will enrich your understanding of the relationship between mass, volume and the density of objects. when making measurements in this experiment we will be using si units, the international system of units. the purpose of using si units is to have the ability to communicate and compare data results with other experiments without having to make conversions. measurement symbol si unit length m meter mass kg kilogram volume l liters density kg/l kilograms per liter any calculations that are performed during this experiment will ultimately be reported in scientific notation. recall that scientific notation is extremely important when we have data that is extremely small or large. scientists rely on a standard form of communication to quickly make hypotheses and judgements based on data. what is the density of block a? a0kg/l what is the density of block b? a1kg/l what is the density of block c? a2kg/l what is the density of block d? a3kg/l what is the density of block e? a4kg/l which block is the densest? a5

What methods could you use to solubilize calcium carbonate