Answer the lab question “how can you use flame color to identify the metal ion in an unknown compound? ” by filling in the boxes below to create a hypothesis. ……… ……….

We have to know how flame colour can be used to identify the metal ion in an unknown compound.

If golden yellow coloured flame , then Na⁺ ion because electrons get excited on heating and again fall back to emit energy of definite wavelengths corresponding to particular colour in the visible region.

If violet coloured flame , then K⁺ because electrons get excited on heating and again fall back to emit energy of definite wavelengths corresponding to particular colour in the visible region.

If crimson red coloured flame , then Sr²⁺ because electrons get excited on heating and again fall back to emit energy of definite wavelengths corresponding to particular colour in the visible region.

If yellowish green coloured flame , then Ba²⁺ because electrons get excited on heating and again fall back to emit energy of definite wavelengths corresponding to particular colour in the visible region.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.