Antacids are used to relieve indigestion. Indigestion is the condition when the stomach produces too much acid resulting in an uncomfortable and painful feeling. A certain antacid tablet dissolves in water and reacts with the acid in the stomach to release carbon dioxide gas.
1.1 Name the type of chemical reaction that explains why antacids bring relief from indigestion. (1)
1.2 A group of learners wants to investigate the effect of temperature on the rate of dissolution of this antacid tablet in water. Design an investigation that the group of learners can conduct, by answering the questions below. 1.2.1 State an investigative question. (2) 1.2.2 State a hypothesis for this investigation. (2) 1.2.3 Write down a procedure that can be followed in this investigation to test your hypothesis using some or all of the apparatus/chemicals listed below:
Antacid tablet (4) 1.2.4 Draw a table that can be used to record the results. Indicate relevant headings of the rows and columns in the table. No values data are required. (4)
1.3 Is it better to take the antacid tablet with warm water or with cold water? Give a reason for your answer. (2)  GAUTENG DEPARTMENT OF EDUCATION SENIOR SECONDARY INTERVENTION PROGRAMME
PHYSICAL SCIENCES GRADE 12 SESSION 22 (LEARNER NOTES) Page 2 of 9 QUESTION 2: 20 minutes (Taken from the DoE Physical Sciences Feb – March Paper 2 2009)
Smog refers to a very unpleasant condition of pollution in certain urban environments.
It is produced largely by the action of sunlight on car exhaust gases. Two groups of compounds emitted from car exhausts, that contribute to the formation of smog, are nitrogen oxides and unburned hydrocarbons.