While actually doing the experiment to compare the dissolved oxygen in several water samples, which controlled variable is the most important?
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?
Use the information to answer this question.
Which of the following is important in the nuclear stability of an atom ?
Airbags are safety features of modern cars that are designed to reduce the impact on passengers by rapid inflation in the event of a collision.
Which list gives the species in the order of decreasing oxidising ability?
Consider the following pairs of substances:
A type of polymerisation reaction involves the release of a water molecule. Which monomer is most likely to be involved in this reaction?
What is the IUPAC name of the following compound?
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?
A student needed to compare the strength of the three hypothetical acids H2A, HB and HC . The following suggestions were given by other students.
In the following nuclear reaction, what is the identity of X ?
Which of the following would most affect the concentration of ions in lakes?
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?
Consider the following oxidation – reduction reaction: