Which type(s) of UV penetrate(s) the atmosphere most?
Four samples of river and ocean water from different areas are tested and the results tabulated. Which of the samples is from a polluted ocean beach?
Which statement best defines the term “specific heat capacity” of a pure substance?
What will be the pH of a solution prepared by mixing 10.0 mL of a 0.200 mol L-1 hydrochloric acid and 5.00 mL of 0.120 mol L-1 barium hydroxide solutions and diluting the mixture to 100.0 mL?
Examine the table on the particle removal range of various filters
Which of the following is least stable in the atmosphere?
If concentrated acid is spilled on the laboratory bench, which of the following measures can best significantly reduce the damage to humans and to the environment?
Which statement best describes the boiling points within a homologous series?
The natural indicator, H2Z , exhibits several colours as the pH changes. This may be explained by the stepwise ionization of H2Z shown by the equations and the subsequent mixing of coloured ions at particular pH values.
Which of the following reactions is a redox reaction?
A catalyst is used in the production of ethanol from ethylene and in the reverse process of the production of ethylene from ethanol. Which is the catalyst used for each of the productions listed above in correct sequence?
A student determined the total dissolved solids in a sample of river water by the evaporation technique. A 9.60 L sample of drinking water was filtered. The dried residue in the filter paper had a mass of 1.22 g. When the filtrate was evaporated to dryness, it yielded a residue of 4.11 g. What is the concentration of the total dissolved solids in ppm?
Consider the following species:
Which of the following can be used to detect radiation?
Why is ethanol used as a major constituent of perfumes?