How Much? Flashcards
what is an isotope?
an atom with a different number of neutron to the other element.
the relative atomic mass (Ar) is the same as what?
mass number.
how do we know the relative formula mass (Mr)
add all the Ar’s of elements in the formula together.
what do you need to remember if you get stuck in the exam?
mass=Mr+Moles
what is the formula for the percentage yield
amount of product produced ÷ maximum amount of product possible × 100
a higher percentage yield means what
higher profit and less wasted product.
what do we call a reaction where the products can react together to make the reactants again?
reversible reaction
how can we show a reaction is reversible?
with a double arrow symbol
additives might be added to food for what 3 reasons?
- improve its taste
- improve its appearance
- preserve it longer
chromatography paper can be used to detect what?
additives in food.
modern instruments allow for what benifits over older technology when detecting additives in food
- faster
- more accurate
gas chromatography seperates the gas mixture
- material on the coloumn has higher attractions to some compounds, those compounds will spend longer in the coloumn because they have a larger retention time.
what can a mass spectrometry do?
measure the Mr of a compound.
the peak with the largest mass corresponds with what?
an ion with one electron removed.
