When a Bunsen burner is lit and not being used for heating things, a _________ flame should be used. What one word completes this sentence?

To switch to the blue flame on a Bunsen burner, you must turn the collar to open the _________ _________. What two word phrase completes this sentence?

When lighting a Bunsen burner, you should always:

Which part of the Bunsen burner flame is the hottest?A. the black partB. the blue flameC. the yellow flameD. none of the above

What action is NOT necessary before lighting a Bunsen burner?Select one:Clear the burner area of flammable materials such as solvents and papers.Check that the gas regulator and air inlet on the burner can be adjusted.Make sure there are no holes in the hose connected to the burner.Leave the gas cock open for a few minutes before lighting to clear the line.

A student was asked by his teacher to perform a flame test on a solid. He used this method.● dip the tip of a clean platinum wire into hydrochloric acid and then into the solid● adjust the air hole of the Bunsen burner to obtain a non - roaring, non – luminousBunsen flame● place the tip of the platinum wire into the edge of the flame● observe the colour in the flame(a) (i) why is it important that the platinum wire is clean?(iii) Why is it important to use a non - luminous flame?(iv) What color would be observed in the flame if the solid contained sodium ions?