*2022 ONDO STATE JOINT EXAM CHEMISTRY*
1bii)The titer value=1st titre+2nd+3rd/3
Indicator is any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.
An indicator is generally a weak acid or weak base that dissociates in a solution to form ions. Indicators are used to test whether a medium is acidic or basic in nature.
(2ai) Faraday’s first law of electrolysis states that during electrolysis, the amount of chemical reaction which occurs at any electrode under the influence of electrical energy is proportional to the quantity of electricity passed through the electrolyte.
i)Extraction and Refining of Metals.
ii)Production of chemicals.
iii)Electrolytic Reduction of Metals from their Compounds: …
(3ai) Boyle’s law states that the volume of gas at constant temperature is inversely proportional to its pressure.
C= K – 273.15
I. C=125-273.15 = -148.15
II. C= 403 – 273.15=129.85
III. C= 298 – 273.15= 24.85
i. Reactant concentration. Increasing the concentration of one or more reactants will often increase the rate of reaction.
ii. Physical state of the reactants and surface area.
iv. Presence of a catalyst.
v. Nature of reactants.
vi. Orientation of reacting species.
vii. Surface area.
viii. Intensity of light.
(PICK ANY SIX)
(4ai)A neutralization reaction is a reaction that yields salts and water when equal amounts of acids and bases react.
i. The pH can be used to control the availability of nutrients, and biological functions.
ii. The pH can be used to control the behaviors of chemicals.