While actually doing the experiment to compare the dissolved oxygen in several water samples, which controlled variable is the most important?
Which compound has the highest ozone-depleting potential?
Understanding the effect of trace elements on the health and well-being of plants and humans requires the use of instruments with certain characteristics. What is the most important of these characteristics?
Expanded polystyrene can be produced by blowing gases through molten polystyrene and then allowing it to cool. A common use of this polystyrene is in the manufacture of protective foam packaging. Which property of polystyrene makes it suitable for this use?
Which list gives the species in the order of decreasing oxidising ability?
In the following nuclear reaction, what is the identity of X ?
Consider the following pairs of substances:
Which of the following would most affect the concentration of ions in lakes?
What is the IUPAC name of the following compound?
Which would be an appropriate test to monitor the chemicals that may lead to eutrophication in waterways ?
Given the following reactions of SO2:
A student needed to compare the strength of the three hypothetical acids H2A, HB and HC . The following suggestions were given by other students.
What is the pH of a mixture of 20.0 mL of 0.102 mol L-1 barium hydroxide solution and 40.0 mL of 0.150 mol L-1 hydrochloric acid diluted to a final volume of 100 mL?
A type of polymerisation reaction involves the release of a water molecule. Which monomer is most likely to be involved in this reaction?
A student used the evaporation technique to determine the total dissolved solids in a water sample provided by her teacher.