5162357
Description
Flashcards by Bee Brittain, updated more than 1 year ago
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Created by Bee Brittain
over 8 years ago
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| Question | Answer |
| Relative Molecular Mass | The weighted mean mass of a molecule relative to the mass of 1/12th an atom of carbon-12 |
| Relative Atomic Mass | The weighted mean mass of an atom of an element compared to 1/12th the mass of an atom of carbon-12 |
| Relative Formula Mass | The weighted mean mass of a formula unit relative to 1/12th the mass of an atom of carbon-12 |
| Relative Isotopic Mass | The mass of an isotope relative to 1/12th the mass of an atom of Carbon-12 |
| Fill in the blanks: The percentage _______ of the isotopes in a sample of an ________ can be found __________ using a mass __________. | The percentage ABUNDANCES of theisotopes in a sample of an ELEMENT can be found EXPERIMENTALLY using a mass spectrometre. |
| After the sample of the element has been placed in the mass spectrometre, what happens to it? | It is vaporized and ionised to form a gas of positive ions |
| After vaporization, how are the ions of the different isotopes in an element separated? | The ions are accelerated. The heavier ions move slower and are therefore harder to deflect than lighter ions, this means the ions of each isotope are separated |
| The ions are detected on a mass spectrum as a mass to charge ratio, this produces a signal, what determines how large the signal is? | Each ion reaching the detector adds to the signal, so the greater the abundance, the greater the signal. |
| Relative Atomic mass can be worked out using isotopic abundances (as percentages) how do you carry out this calculation? | You times the Atomic mass of each isotope of the element by its isotopic abundance. Then you add up all the results and divide them all by 100. |
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