-
-
-
- X because its boiling point is lower than that of room temperature and it is slightly
soluble in water - V
- X because its boiling point is lower than that of room temperature and it is slightly
- W
-
-
- Alkaline earth metals
- G
- Covalent bond
Because the bond is formed by sharing of electrons since they are both non-metals elements - J2O3
- Tick
-
-
-
- E
Rise in temperature is lower, showing that the acid is partially ionized hence some energy is used to ionize its molecules fully
NaOH(aq) + CH3COOH(aq) → CH3COO.Na(aq) + H2O(l)
- E
-
- Is the amount of heat energy required to convert one mole of a liquid substance at its boiling point to its gaseous state.
- ...........
- ΔH1= -133 kJ/mole
ΔH2= -188 kJ/mole
ΔH3= -133 +188 = +55 kJ - H2O(l) → H2O2 ΔH3= -133 +188 = +55 kJ
-
- Is a substance that provide useful energy when it undergoes a chemical or nuclearreaction
-
- Hydrogen gas burns to produce steam which is a non- pollutant to the environment
Hydrogen gas has a high energy content hence very small amount produce a lot of heat energy - Hydrogen gas can easily explode when burning since it is highly flammable unlike fossil fuels.
- Hydrogen gas burns to produce steam which is a non- pollutant to the environment
-
-
- Solvay process
- Ammonia gas
Limestone / calcium carbonate
Brine / concentrated sodium chloride - Ammonia gas
- Filtration
- Calcium chloride
2NH4Cl(aq) + Ca(OH)2(aq) → CaCl2(aq) + 2H20(l) + 2NH3(g) - Sodium carbonate
2NaHClO3(s) → Na2C03(s) + H20(l) + C02(g)
From equation : 2 moles NaHC03 produces 1 mole Na2C03
R.M.M of NaHC03 is (1 x 23) + (1x1) + (1 x 12) + (3 x16) = 84
(84g/1000g X 1) kg is 0.084 kg
2 mole NaHC03 is 0.084 x0.168 kg
R.M.M of Na3C03 is (2 x 23) + (1x12) + (3 x16) = 106
(106g/100g x 1 kg) is 0.106 kg
If, 0.168 kg NaHC03 produces 16 Kg
98.128 produces (98.128 x 0.106 Z
-
- -2.90 volts
- U
Hydrogen is used as the reference electrode hence its E O is 0.00 volts - Drawing
- On the diagram
- Eo cell = Eo reduced - Eo oxidized
= (+0.34)- (-2.38) = +2.72 V - 2 moles of e - deposits 63.5g Cu
2 faradays deposits 63.5g
2 x 96 500 I 1 = 193 000 c
If, 63.5 g Cu is deposited by 193000 c
1.48 g is deposited by 1.48 x 193 000 x 63.5 = 4498.2677 c
Q = it
4498.2677 = I x (2 x 60 x 60 ) + 30 x 60 I = 4498.2677/9000 = I = 0.4998A
-
-
- N/A
- CH3CH2CH20H
- Concentrated sulphuric (VI) acid
Acidified potassium manganate (VII) - Polypropene . used in manufacture of plastic crates, carpets, boxes
- Hydrogen gas
2CH3CH1CH10H + 2K → CH3CH2CH2OK + H2(g)
Potassium propoxide
- DRAWING
-
-
- Magnetite
- This is because iron from the blast furnace is impure and presence of impurities lowers its melting point
- To produce calcium oxide which reacts with silica for form slag
- Slag is immiscible with molten iron
- To conserve heat energy in order to maintain the optimum temperature needed for the reduction of the iron (III) Oxide
- Carbon
3C(s)+ 2Fe2O3(aq) → 3C4Fe(l) + 3C02(g) - Because the reaction between coke (or coal) and hot air at point A is highly exothermic.
- Pig iron
H is reduced by blowing oxygen gas into molten iron which conve1is carbon into carbon (VI)oxide gas.
-
-
- Ca(HCO3)2(aq) + Ca(OH)2(aq) → 2CaC03(s) + 2H20(l)
- If, in 1000cm3 are 0.01 mole calcium hydroxide
In 90cm3 are 90 x 0.01/1000 = 0.0009 mole of calcium hydrogen - When soap solution is added, it initially will form scum because water will still be hard
Later lather will be produced because all calcium ions in the water will have been precipitated
-
- The magnesium .and calcium ions in water are exchanged with sodium ions in the permutit
- By passing a solution of concentration sodium chloride through the column
- Leads to formation of boiler scales which acts as an insulating layer that leads to fuel wastage
- For forward reaction: H2O is the base since accepts a proton
- For backward reaction: HO2− is the base since it accepts a proton.
-
Join our whatsapp group for latest updates
Tap Here to Download for 50/-
Get on WhatsApp for 50/-
Download CHEMISTRY PAPER 2 Marking Scheme - 2019 KCSE Prediction Answers Set 1.
Tap Here to Download for 50/-
Get on WhatsApp for 50/-
Why download?
- ✔ To read offline at any time.
- ✔ To Print at your convenience
- ✔ Share Easily with Friends / Students