Atoms, Ions And Compounds Flashcards
What does a mass spectrometer produce?
Mass spectra
How do you convert cm2 to dm2?
Divide by 1000
Define oxidising agent
Electron acceptor
Strips electrons off substances
Define reducing agent
Substance able to provide electrons
Electron donator
Define relative atomic mass
Weighted mean mass of one atom of an element compared to 1/12 the mass of a atom of carbon-12
Define relative isotopic mass
Mass of one atom of an isotope compared to the mass of 1/12 the atom of carbon-12
What is the chemical formula for an ammonium ion?
NH4 +
What is the chemical formula for a hydroxide ion?
OH -
What is the chemical formula for a silver ion?
Ag +
What is the chemical formula for a sulphate ion?
SO4 2-
What is the chemical formula for a nitrate ion?
NO3 -
What is the chemical formula for a zinc ion?
Zn 2+
What is the chemical formula for a scandium ion?
Sc 3+
What is the chemical formula for a carbonate ion?
CO3 2-
Define molar mass
Mass of substance per mole
What’s the equation for concentration?
n=cv
What occurs if a 2+ ion is produced in a mass spectra?
M/z halfed
Abundance the same
Describe how a mass spectra works
Substance vaporised
Ionised by bombarding with electrons
Accelerated and deflected using magnetic or electric fields
Heavier = Larger radius of curve
Dectector records m/z and abundance
What ions must be produced in a mass spectrometer?
Positive
What is the mass of an electron?
1/1836
Why do isotopes have the same chemical properties as atoms of the same element?
Chemical properties are due to electronic structure which is the Same in both
Why do isotopes have different physical properties to atoms of the same element?
Different mass numbers
So different densities and BP
State whether the physical and chemical properties of atoms and isotopes of the same element are the same or different
Physical= different (different mass number (so density))
Chemical = same (same electronic structure)
Compare molecular and formula mass
Molecular= small molecules
Formula= Larger molecules
What goes of the axis of a mass spectra?
X= m/z (mass : charge)
Y= % abundance
Compare the flight of heavy and light ions in a mass spectrometer
Heavy = Larger radius and longer flight time
