6.2 Factors Affecting Reaction Rate
(1) What is noteworthy about similar elements?
Similar elements (such as those in the same group of the periodic table) tend to react similarly, but at different areas.
(1) Describe the type of reaction that metals undergo with oxygen.
Similar, but metals like sodium and potassium are so reactive that they are never found as elements in nature. Gold and silver are so slow to react that they are chosen for jewellery and precious objects.
(5) Describe the surface area factor.
The amount of exposed surface area affects the reaction rate. The reaction rate increased with the increase in the surface area.
(3) If the temperature of the reaction is...
increased, the rate of reaction is increased
(2) If the initial concentration of the reactant is...
increased, the rate of the reaction is increased.
(4) Define catalyst.
A substances that alters the rate of a chemical reaction without being permanently changed itself.
(4) How were almost all catalysts discovered?
By trial and error.
List the five factors that affect reaction rate.
Chemical nature of reactants. Concentration of reactants. Temperature. Presence of a catalyst. Surface area.
(4) Give three examples of catalyst usage.
Chlorophyll required for photosynthesis. Powdered platinum/palladium in catalytic converters convert car exhaust into less harmful gases. Enzymes (proteins) in the human body
(3) Give an example of temperature as a factor in reaction rates.
The metabolic rates of reptiles change in response to the temperature of their surroundings.