NOTES AND ANSWERS 4 ALL SUBJECTS!!!!!!!!!!!!!: CHEMISTRY FORM 4 PAPER 3

NOTES AND ANSWERS 4 ALL SUBJECTS!!!!!!!!!!!!!

Thursday, 25 April 2013

CHEMISTRY FORM 4 PAPER 3

Chapter 3 Chemical Formulae and Equations

List of PEKA experiments:

Empirical formula of copper(II) oxideEmpirical formula of magnesium oxideChemical equations

NumberActivity 3.4Pg.23TitleEmpirical formula of copper(II) oxideAimTo determine the empirical formula of copper(II) oxideProblem StatementHow does the formula of copper(II) oxide determine?HypothesisThe empirical formula of copper(II) oxide can be determined by finding out the mass of copper and oxygen in a sample of copper(II) oxideApparatusU tubeStoppersGlass tubeCombustion tube with a small hole at the endRetort stand and clampSpatulaPorcelain dishBunsen burnerBalance

Preparation for hydrogen gas

Thistle funnelFlat-bottomed flask

MaterialHydrogen gas, H2Copper(II) oxideAnhydrous calcium chloride, CaCl2Wooden splinter

Preparation for the hydrogen gas

Dilute hydrochloric acidZinc pieces

VariablesManipulated variable: Mass of copper oxideResponding variable: Mass of copper formedControlled / Fixed variable: An excess of hydrogen gas

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NumberActivity 3.5Pg.25TitleEmpirical formula of magnesium oxideAimTo determine the empirical formula of magnesium oxideProblem StatementHow does the formula of magnesium oxide determine?HypothesisThe empirical formula of magnesium oxide is MgOApparatusCrucible with lidTongsBunsen burnerTripod standPipe-clay triangle

Material10 cm magnesium ribbonSandpaper

VariablesManipulated variable: Magnesium ribbonResponding variable: Mass of magnesium oxideControlled / Fixed variable: Length / Mass of magnesium ribbon and excess air

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NumberActivity 3.6Pg.27TitleChemical equationsAimTo construct balanced chemical equations

A. Heating of copper(II) carbonate

B. Reaction of ammonia gas and hydrochloric acid / Formation of ammonium chloride

C. Reaction of lead(II) nitrate and potassium iodide / Precipitation of lead(II) iodide

Problem StatementHow does the chemical equations determine?HypothesisA. The chemical equation of copper(II) carbonate is CuCO3> CuO + CO2

B. The chemical equation of

ApparatusBoiling tubeTest tubesRubber bung with delivery tubeTest tube rackTest tube holderStoppersBunsen burner

MaterialCopper(II) carbonate powderLime waterConcentrated ammonia solutionConcentrated hydrochloric acidLead(II) nitrate solutionPotassium iodide solution

VariablesA. Heating of copper(II) carbonate

Manipulated variable: Mass of copper(II) carbonateResponding variable: Mass of copper oxide formed / Volume of carbon dioxide liberatedControlled / Fixed variable: Pressure

B. Reaction of ammonia gas and hydrochloric acid / Formation of ammonium chloride

Manipulated variable: Concentration of ammonia and hydrochloric acidResponding variable: Ammonium chloride formedControlled / Fixed variable: Temperature and pressure

C. Reaction of lead(II) nitrate and potassium iodide / Precipitation of lead(II) iodide

Manipulated variable: Volume of lead(II) nitrate solution and volume of potassium iodide solutionResponding variable: Mass of lead(II) iodide formedControlled / Fixed variable: Temperature and pressure

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