In an experiment undertaken much like yours , a student react 0.045 g of magnesi

Question

In an experiment undertaken much like yours , a student react 0.045 g of magnesium in a endiometer filled with water and ice . The water temperature was 21 . 0 degree C . The barometer is the lab read 29 . 86 is Hg and 52 . 8 ML of gas was collected. For each of the following experimental of calculation errors , too low , or unchanged. Explain your answers The temperature of the water recorded too low. The mass of the Magnesium was recorded too high The magnesium was coated with magnesium oxide Some air bubbles are introduced when the endiometer was inverted Some of hydrogen gas dissolved in water (Hint : If it is dissolved , it won't be bubble !)

Explanation / Answer

a) magnesium react slowly with hot water

b) Magnesium react vigrously with steam to form white light , steam and hot solid magnesium. Therefor mass is too high.

c) when magnesium react with oxygen it forms white flame and magnesium oxide.

d) Air bubles are due to the libration of hydrogen gas

e) SOme hydrogen dissolved in water and some are librated into the air.

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