paper 2,FWAQ
No description yet. This curated deck is ready for daily study.
Card preview (24)
why do you swirl the flask during titration
to mix the contents together
State why she adds the wine drop near the end point
to avoid overshooting the end point and achieve accurate results
what is the Colour of fluorine
pale yellow
predict the formulae of molecule astatine
At2
what is an oxidising agent
Something that causes another substance to loose electrons something that gives oxygen something that gains electrons
explain why chlorine is more reactive than bromine
Bromine and chlorine react by gaining electrons Bromine atom larger than chlorine Bromines outer shell electron has a weaker attraction to the nucleus So less tenancy to gain an electron making it less reactive
why can’t covalent bonds conduct electricity
Held together tightly No delocalised electrons which are free to move an carry charge Molecules with no overall charge
name the type of particle in the solution of the dilute hydrochloric acid
ions
during electrolysis explain the cause if an anomalous result
volume was less than expected Leak in apparatus
suggest how these ionic half equation show that the volume collected in syringe x should be the same as the volume of hydrogen collected in syringe y
one mole of chlorine one mole of hydrogen
suggest why the volume of chlorine collected in syringe x is always less than the volume of hydrogen collected in syringe y
chlorine dissolves/soluble in acid
Describe a method that the student use to find out which solids act as catalyst
do experiment without hydrogen peroxide Use known volume of hydrogen peroxide Measure time to collect certain vol of oxygen gas Repeat using same volume of hydrogen peroxide With known mass of solid x y then z Measure the time taken to collect volume of oxygen gas After reaction remove solid x y and z by filtration and measure mass to see if it has remained unchanged Reduced time taken for certain volume to be collected is a possible catalyst
if temperature increase which direction do you shift towards
endothermic
if temperature decrease which direction do you move towards
exothermic
What is the test for chloride
add nitric acid ADD Silver nitrate white precipitate
why allows stronger than pure metals
in pure metals all metals are the same size layers can slide over each other making them soft/malleable alloy has atoms of different sizes which disrupts the structure so that the layers do not slide over each other/ it is harder for them to slide over each other
what is an atom
each single letter in the formular
what is an element
the number of letters in the formular
what is a molecular formular compared to an empirical formular
non-simplified version
what is an empirical formular
simplified version
what is the sulfate ion
SO4^2-
What is the ionic half equation for the formation of oxygen at the positive electrode
4OH-( MINUS)—-> O2 + 2H2O + 4 e-
suggest why copper sulfate contains some OH ions
OH ions are present in water
what is the word equation for the fermentation of glucouse
glucouse ——> ethanol + carbon dioxide