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12 Cards in this Set
- Front
- Back
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Describe how paper chromatography works? |
1) draw a line with a ruler and a pencil on the chromatography paper as pencil is insoluble in water. 2) place à dot of ink on the line. 3) place the paper in the solvent (water) 4)solvent rises up the paper separating the dyes. 5) different dyes travel at different distance based on solubility. 6) solutés at the top has a higher solubility. |
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Why is the threatrical yield always greater that the actual yield tick |
1) reactants are lost 2) reaction is reversible or incomplete 3) side reactions occur |
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why is there a lid |
1) to prevent evaporation And stop the soluble particles from escaping |
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Describe the process of gas chronography tick |
1)Substance is vaporised and carried by gas 2)They travel through a column filled with solid material 3) the mixture of compounds can be separated as they travel in different speed 4) the time taken for the substance to be reached is called the retention time
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What information does the molecular ion give in a mass spectrometer? Tick |
Mr molecular mass |
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What are 3 subatomic particles including mass and charges? Tick |
1) proton ,positive 1+, mass 1 2) neutron, neutral 0, mass 1 3) electron, negative 1-, mass 1/1840,0 |
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Definition of atomic number,mass number,isotope, R.A.M, empirical and molecular formula. Tick |
-Atomic number is the number of protons and also the order in the periodic table -mass number is the number of protons and neutons together -isotopes are the same number of protons (atomic number), but different number of neutrons. -Relative atomic mass is the mass of an atom relative to 1/12 of carbon 12 -empirical formula is the formula in its simplest whole number ratio of atoms of each element in a substance -molecular formula is the formula showing the actual number of atoms of each element in a molecular |
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Why is gas chromatography better than paper chromatography? |
more faster, accurate, sensitive, detects less quantity |
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What is gas chromatography? |
Separates a mixture of compounds based on their speed |
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Define mole |
Mole is the number of atoms in exactly 12 grams Aka avogadro's number. |
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What is paper chromatography? |
Separates à mixture of dyes(solutes) based on their solubility |
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Why is the mass spectrometer link to gas chromatography?? What information does the gas chromatography contain? ? |
Molécules lose electrons to become molecular ions. Furthest(last) peaks on the detector gives you the relative molecular mass (MR) |
