Design a practical investigation into the formula of a metal oxide.

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Design a practical investigation into the formula of a metal oxide.

Aim: to determine the formula of magnesium oxide.

Hypothesis: I think that the formula for the metal oxide magnesium oxide, will be MgO.

Variables

Independent: the mass of magnesium is manipulated as different sizes are cut from the roll of magnesium. The mass is the variable that is altered.

Dependant: the mass of magnesium oxide formed will be the measured variable as it enables us to determine the formula for magnesium oxide.

 Controlled

Each strip of magnesium was taken from the same roll. If magnesium ribbons were taken from various rolls, the reaction with oxygen and the formation of magnesium oxide would be affected. The same roll  ensured that all the magnesium used was the same.

The magnesium was scraped with sand paper. This was to remove any oxygen that may have formed onto it. Any oxygen on the magnesium would have altered the results. Scraping  guaranteed that pure magnesium was being reacted and this made the results more accurate.

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The same balance was used to weigh  the equipment. This ensured that the uncertainty was the same and that  the measurements were accurate.

Equipment

  • Roll of magnesium
  • Crucible
  • Crucible lid
  • Pipe clay triangle
  • Tripod stand
  • Electronic balance
  • Bunsen burner
  • Tongs

Method

Weigh the empty crucible and lid together. Record the results in a table.

Place magnesium coil into crucible and cover with lid.  Place on electronic  balance and record results in table.

Set  up the equipment as shown in figure 1, leaving some space between the lid and crucible for oxygen ...

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