Part b solid lithium metal and diatomic nitrogen gas react spontaneously to form a solid product. give the balanced chemical equ
1 answer:
Lithium metal which is an alkali metal belongs to the Group I of the periodic table reacts spontaneously with nitrogen, (which remains in gaseous form at room temperature) to form solid lithium nitride (). The reaction can be shown as- 6Li (s) +
(g) =
(s). This is the only example of alkali nitride in chemistry. The other alkali nitrides are either not stable or does not exist in solid form at room temperature.
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Answer:
Indicators show changes in the pH of a solution
Explanation:
A pH meter is an instrument that measures the hydrogen-ion activity in aqueous solutions, indicating the acidity or alkalinity of the solution expressed as pH .The pH meter measures the difference in electrical potential between a pH electrode and a reference electrode, hence the pH meter is sometimes referred to as a potentiometric pH meter. Potentiometric pH meters measure the voltage between two electrodes and display the result converted into the corresponding pH value. The instrument comprises of a simple electronic amplifier and a pair of electrodes, or alternatively a combination electrode, and some form of display calibrated in pH units. It usually has a glass electrode and a reference electrode, or a combination electrode. The electrodes, or probes, are inserted into the solution to be tested.
Organic indicators are chemical species that change their colour in response to changes in the pH of the solution. This implies that the anionic and protonated forms of the indicator possess different colours. Hence the colour changes in acidic, basic and neutral solutions. The images attached indicate the colour changes in phenolphthalein and methyl orange in acidic and basic media accordingly.
