Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
8 Cards in this Set
- Front
- Back
|
-Define the term relative atomic mass -In a mass spectrometer, the relative abundance of each isotope is proportional to thecurrent generated by that isotope at the detector. Explain how this current is generated. |
-Mean average mass of atoms of an element compared to carbon-12 -Electron(s) transferred / flow (at the detector)(From detector / plate) to the (+) ion |
|
|
State the meaning of the term first ionisation energy |
Energy/enthalpy (needed) to remove one mole of electrons fromone mole of atoms/compounds/molecules/elementsOREnergy to form one mole of positive ions from one mole of atomsOREnergy/enthalpy to remove one electron from one atomIn the gaseous state (to form 1 mol of gaseous ions) |
|
|
State and explain the general trend in the first ionisation energies of the Period 3elements sodium to chlorine |
Increase Bigger nuclear charge (from Na to Cl)/more protons electron (taken) from same (sub)shell/ similar or same shielding/electron closer to the nucleus/smaller atomic radius |
|
|
State the element in Period 3 that has the highest melting point.Explain your answer. |
Silicon / Si covalent (bonds) Strong or many of the (covalent) bonds need to be broken / needs a lot ofenergy to break the (covalent) bonds |
|
|
State the element in Period 3 that has the highest first ionisation energy.Explain your answer. |
Argon / Ar Large(st) number of protons / large(st) nuclear charge Same amount of shielding / same number of shells / same number of energylevels |
|
|
Predict whether the atomic radius of 124Te is larger than, smaller than or the same as theatomic radius of 130TeExplain your answer. |
Same (Each isotope has the) same number of protons/same nuclear charge andsame number of electrons / electronic configuration |
|
|
Explain, in terms of electronegativity, why the boiling point of H2S2 is lower than H2O2 |
Electronegativity of S lower than O or electronegativity difference between Hand S is lowerNo hydrogen bonding between H2S2 moleculesOr only van der Waals / only dipole-dipole forces between H2S2 molecules |
|
|
A TOF mass spectrometer can be used to determine the relative molecular mass ofmolecular substances.Explain why it is necessary to ionise molecules when measuring their mass in a TOFmass spectrometer |
Ions, not molecules, will interact with and be accelerated by anelectric fieldOnly ions will create a current when hitting the detector |
