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A level OCR A physical/inorganic chemistry mistakes Questions & 100% Correct Answers- Latest Test | Graded A+ | Passed
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A student prepares a solution of calcium nitrate by reacting dilute nitric acid, HNO3, with the base calcium hydroxide, Ca(OH)2. (i) Why is calcium nitrate an example of a salt? ֎ -:- The H+ ion in a nitric acid has been replaced by a metal ion OR by a Ca2+ ion MCl2.2H2O is a salt with water...

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  • August 26, 2024
  • 24
  • 2024/2025
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Excellence is key | 2024/2025 ~Page |1



A level OCR A physical/inorganic
chemistry mistakes Questions & 100%
Correct Answers- Latest Test | Graded A+
| Passed
A student prepares a solution of calcium nitrate by reacting dilute nitric acid, HNO3, with

the base calcium hydroxide, Ca(OH)2.




(i) Why is calcium nitrate an example of a salt?


֎ -:- The H+ ion in a nitric acid has been replaced by a

metal ion OR by a Ca2+ ion




MCl2.2H2O is a salt with water of crystallisation, and M is a metal. the water of

crystallisation makes up 22.2% by mass of the hydrated salt. What is the relative formula

mass of the anhydrous salt?


֎ -:- 126




Strontium reacts in a similar way to magnesium.


Describe one difference you might observe if strontium, instead of magnesium, was


reacted with dilute hydrochloric acid.


֎ -:- more gas/hotter/quicker




26/08/2024 | © Copyright- This work may not be copied for profit.

, Excellence is key | 2024/2025 ~Page |2


A student believes a box of caustic soda has been accidentally contaminated.


• To prove this, the student dissolves 2.00 g of the impure caustic soda in water and the

solution is made up to 250 cm3.


• 25.0 cm3 of this solution of caustic soda is neutralised by 24.60 cm3 of 0.100 mol dm-3


dilute sulfuric acid.


H2SO4(aq) + 2NaOH(aq) Na2SO4(aq) + 2H2O(l)


(iii) Calculate the percentage, by mass, of NaOH in the impure caustic soda.


֎ -:- Moles of NaOH in 250 cm3 =

0.00492 x 250/25 = 0.0492 mol


Mass of NaOH in original sample


= 0.0492 x 40.0 = 1.968 g


% purity 1.968/2 x 100 = 98.4%




The following reaction took place.


MgCO3(s) MgO(s) + CO2(g)


The student repeated the experiment a further three times, using the same number of

moles of CaCO3, SrCO3 and BaCO3.


What trend in the behaviour of the Group 2 carbonates would be observed by the student?


֎ -:- The ease of (thermal) decomposition decreases

(down the group)


26/08/2024 | © Copyright- This work may not be copied for profit.

, Excellence is key | 2024/2025 ~Page |3




how do you explain a molecules shape?


֎ -:- 1. State number of bonding pairs and lone pairs of electrons.

2. State that electron pairs repel and try to get as far apart as possible (or to a position of

minimum repulsion.)


3. If there are no lone pairs state that the electron pairs repel equally


4. If there are lone pairs of electrons, then state that lone pairs repel more than bonding

pairs.


5. State actual shape and bond angle.




What 3-D shape is the 5s orbital?


֎ -:- spherical




Why is the second ionisation energy of rubidium larger than the second ionisationenergy of

strontium?


֎ -:- There is one shell fewer in Rb(+) (than Sr+)

Rb(+) has a smaller radius (than Sr+)


Rb(+) loses an electron from the 4th shell AND Sr(+)


loses an electron from the 5th shell.


2nd IE of Rb involves removing electron from shell



26/08/2024 | © Copyright- This work may not be copied for profit.

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