(b) The reaction between an acid and a base produces salt and water. A mixture of
100.0 cm' of 0.431 mol dm HCI solution and 100.0 cm' of 0.216 mol dm Ba(OH)2, solution is
added into a constant-pressure calorimeter. Determine the final temperature of the mixture if the
initial temperature of both solutions is 20.5 °C.
[5]
[Specific heat capacity of water is 4.18 Jg'°C and heat of neutralisation is -56.2 kJ mol-')

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask

Choose all the answers that apply. as ocean depth increases, temperature decreases temperature increases pressure increases pressure decreases salinity increases density increases

Identify two types of chemical bonding in the source of dietary potassium