Topic 8- Chemical Analysis
- Created by: Aimee978
- Created on: 19-10-17 17:14
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- TOPIC 8- CHEMICAL ANALYSIS
- PURITY AND FORMULATIONS
- A pure substance is made with only one element or compound
- The boiling/melting point can help you to tell how pure a substance is
- A pure substance will melt/boil at one temperature
- The boiling/melting point can help you to tell how pure a substance is
- Impurities will lower the melting/boiling points and increase the range of points
- A formulation is a useful mixture with a precise purpose, made by following a formula
- Formulations include ingredients such as: Pigment, solvent, binder and additives
- Pigment for colour
- Additives to change taste + other physical/chemical properties
- Binder to stick and hold everything together
- In everyday life these are things like: Cosmetics, medicine, cleaning products etc.
- Formulations include ingredients such as: Pigment, solvent, binder and additives
- A pure substance is made with only one element or compound
- CHROMATOGRAPHY
- Chromatography is used to separate substances in a mixture
- Molecules wit higher solubility and which are less attracted to the paper will travel further
- Molecules with lower solubility and which are more attracted to the paper will travel less
- Molecules wit higher solubility and which are less attracted to the paper will travel further
- We calculate Rf values for each chemical in a chromatograms
- Calculating the Rf value: Distance travelled by the substance / distance travelled by the solvent
- Chromatography is used to separate substances in a mixture
- TESTS FOR GASES
- Chlorine: bleaches damp litmus paper white
- The paper may turn red at first because Chlorine has an acidic Ph
- Oxygen: Relights a glowing splint
- Carbon Dioxide: Bubbling C02 through limewater (calcium hydroxide) should turn the solution cloudy
- Hydrogen: Holding a lit splint over a test tube containing Hydrogen should produce a squeaky pop
- The noise is because the Hydrogen burns quickly with the Oxygen to form H20
- Chlorine: bleaches damp litmus paper white
- PURITY AND FORMULATIONS
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