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?
A 250 mL sample of rainwater is titrated using 0.0095 mol L-1 sodium hydroxide solution. If 8.30 mL of the sodium hydroxide solution was required to reach the endpoint, what was the pH of the rainwater?
Consider the following species:
Examine the table on the particle removal range of various filters
Given the following reactions:
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 can be used to detect radiation?
Which of the following reactions is a redox reaction?
How much oxygen gas is required for the complete combustion of 1.0 mol ethane?
Which statement best defines the term “specific heat capacity” of a pure substance?
Which statement best describes the boiling points within a homologous series?
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?
Why is ethanol used as a major constituent of perfumes?
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?