Submission Date: 18th April 2012
In the experiment, when oxygen is being tested, a glowing splint will be used and when that splint is placed in to the mystery gas and the splint reignites, then the gas is oxygen. When hydrogen is being tested, a burning splint will be used and when the splint is placed in to the mystery gas and a “pop” sound occurs, then the gas is hydrogen. When carbon dioxide is being tested, limewater will be added to the gas (produced by combining hydrochloric acid and sodium bicarbonate), if the limewater turns cloudy or turns milky then the gas is carbon dioxide.
What is the effect of different reactants on the type of gases produced?
Oxygen: If Hydrogen Peroxide and Manganese Dioxide are combined, then oxygen will be produced because the chemical formula for Hydrogen Peroxide (H2O2) contains oxygen and the chemical formula for Manganese Dioxide (MnO2) contains oxygen. Hydrogen: If Hydrochloric acid and Magnesium are combined, then Hydrogen will be produced because the chemical formula for Hydrochloric acid (HCI) contains Hydrogen. Carbon Dioxide: If Hydrochloric acid and Sodium Bicarbonate are combined, then Carbon Dioxide will be produced because the chemical formula for Sodium Bicarbonate (NaHCO3) contains Carbon Dioxide.
Independent Variable: The reactants that were added
Dependant Variable: The gases that were produced
Control Variable: The amount of reactants added should stay the same for each experiment, the type of splint should stay the same because different splints could produce different amounts of heat and the type of reactants should stay the same for each experiment.
Refer to investigation 2.6, identifying mystery gases. Science 9. Changes: - Apron wasn’t used
* A test tube stopper wasn’t used
* Tongs weren’t used