Past paper 1 lost marks Flashcards
what is the formula for Fe(I),Fe(II),Fe(III)
Fe^+,Fe^2+,Fe^3+
what is Hydroxide charge and formula
(OH-)
what is the Nitrate charge and formula
(NO3-)
what is the Carbonate charge and formula
(CO32-)
what is the Sulfate charge and formula
(SO42-)
what is the Ammonium charge and formula
(NH4+)
Write an ionic equation for the neutralisation of hydrochloric acid with potassium hydroxide
H^+ + OH^- ———> H2O
Explain why sodium oxide has a high melting point
there are strong Ionic bonds that have strong electrostatic attraction and are in a giant ionic lattice
In an Evaluation question what should you keep in mind sometimes when dealing with the products in a table
that the products come together not separate
give two observations you could make when a small piece of potassium is added to water
because it’s a small piece it fizzes
* (potassium) floats
* (potassium) melts
* (potassium) moves around
* potassium becomes smaller
* (lilac) flame
* effervescence
quickly make a drawing in head of what an ionic bond between sodium and oxygen looks like in a dot and cross diagram
how should the filtrate be evaporated gently
water bath
what are all the diatomic ions
have no fear of ice cold bear
H2,N2,F2,O2,I2,Cl2,Br2
In electrolysis when does hydrogen form on the the cathode/negative electrode
when the hydrogen is less reactive than the metal
why does copper not react with hydrochloric acid
because copper is less reactive than the hydrogen it cannot displace it
why does copper carbonate + copper oxide only with hydrochloric acid make copper salt with no by product of copper like copper + copper carbonate only
because copper carbonate + copper oxide are bases which react with acid to make salt and hydrogen gas while copper + copper carbonate makes salt but also a by product of copper that didn’t displace with hydrogen as it’s less reactive
molten lead bromide, bromine is produced at the positive electrode. complete the half equation for the production of bromine you should balance the half equation
Br^- ——> +
2Br^- —–> Br2 + 2e^-
explain to me the double replacement reaction of MgO(s) + H2SO4(aq) →
it’s a (metal oxide + acid → salt + water) reaction
so the reaction is MgO + H2SO4 → MgSO4 + H2O when the MgO has a +0 charge, the Mg dicplaces the H2 which makes SO4 ^2- and then Mg leave’s the O and becomes Mg^+2 which bonds with SO4^-2 making a neutral bond MgSO4, And the O reacts with the H2 to make H2O
some some of the copper produced did not stick to the negative electrode but fell to the bottom of the Beaker suggest how the students could find the total mass of the copper produced
Filtre the mixture, wash the and dried the copper residue, where the copper collected, after increasing mass
what should you do when drawing exothermic graph
label the activation energy and the energy released
how do you work out the number of atoms in something
mole’s * 6.02*10^23
Acid + metal
salt + H2
Acid + metal hydroxide
salt + water
Acid + metal oxide
salt + water
