Paper 1-2018 Flashcards
Total pressure is 150 and eq. mixture is 0.80 for ammonia. Partial pressure of the rest. 1:3 ratio for ammonia and hydrogen
0.80 X 150=120
150-120=30
N:0.25 X30=7.5
H:0.75 X30=22.5
Kp
Products divided by reactants
Circular brackets
Reaction between ammonia and o2 carried out at higher temps, how does this affect ^G?
^G gets more negative as temp increases, TAS gets bigger and AS is +ve
Pt acts as heterogeneous catalyst with NH3 and O2. Provides alternative reaction route with lower activation energy. Explain how
Reactants aboairbed onto pt surface/active site
Reaction takes place /bonds weaken
Desorption of product from surface
Ammonia reacts with ox, N2O can be produced give equation
2NH3+2O2—->N2O+3H2O
2nd IE of Ca lower than k
Ca+ outer electrons further away from nucleus/ or loses e from a higher energy orbital
More shielding in ca+
S block metal with highest IE
Beryllium
Hydroxide in group 2 that is least soluble in water
Mg(OH)2
Ionic equation between BaCl2+Na2SO4
Ba2++SO42- —>BaSO4
Why do isotopes have identical chemuxal properties?
Same electron configuration
Ion with longest TOF
Add a charge to isotopes given
TOF Calculations
2KE=mv^2
T=d^m/2ke
Strong by acid
Fully ionised/fully dissociates
Why water neutral at 30°
Conc of H+=OH-
Oxide that can react with water to form a solution with PH2
SO2
Acid buffer added
Buffer acid- A(increases) BS(decreases)
How salt Bruce provide electrical connection between two solutions
Free ions/ions can move
Why same electrode metals have different electrode potentials?
Conc. not the same(1.0moldm-3)
Why EMF of cell goes to 0V?
Ions of two solutions become equal/same
Complex ion Al acts as Bronsted Lowry acid with water
[Al(H2O)6]3+ H2O—> [Al(H2O)5(OH)]2+H3O+
Xs Na2CO3 added to Al complex. Two Obs
White ppt
Fizzing/bubbling
Why NaBr has higher bp than Na and NaI?
Na:
-Metallic bonding. Attraction between positive nucleus’s and delocalised electrons. Has giant lattice structure
NaBr/NaI:
Ionic bonding in both. Attraction between + and - ions. NaBr and NI have giant lattice structure
Ionic bonds stronger than metallic. stronger attraction between + and - ions in NaBr and NaI as Br- ion is snn no allergy than I- ion therefore closer to nucleus.
Sodium reaction with water
2Na+2H2O—>2NaOH+H2
Shape of NH2 ion
Bent ,2Lp,104.5°
electron repel to be as far apart as possible
lp/lp>Lp/bb>bp/bp
