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0
votes
Write down the formula of the following compounds
answered
Aug 4, 2021
in
Chemistry Form 3
the mole formulae and chemical equation
empirical and molecular formulae
0
votes
The graph below shows a curve obtained when water at 20℃ was heated for 15 mins.
answered
Aug 4, 2021
in
Chemistry Form 1
simple classification of substances
0
votes
Determine the number of sodium ions contained in 25cm3 of 0.5M sodium carbonate solution [a=6.023 x 1023]
answered
Aug 4, 2021
in
Chemistry Form 3
the mole formulae and chemical equation
0
votes
The diagram below represents a paper chromatograph for three brands of juices suspected to contain banned food colourings
answered
Aug 4, 2021
in
Chemistry Form 1
simple classification of substances
0
votes
answer to electrical current passing through H2SO4 State and explain the change in mass that occur when following substances are separately heated in open crucibles [4 mks]
answered
Aug 4, 2021
in
Chemistry Form 3
nitrogen and its compounds
metals
0
votes
The diagram shows electric current passing through dilute sulphuric (iv)acid
answered
Aug 4, 2021
in
Chemistry Form 2
effect of electric current on substances
0
votes
Write down an ionic equation for the reaction between dilute hydrochloric acid and calcium carbonate
answered
Aug 4, 2021
in
Chemistry Form 3
the mole: formulae and chemical equations
0
votes
Give two properties of aluminum that makes it very suitable for making cooking utensils
answered
Aug 4, 2021
in
Chemistry Form 4
metals
aluminium
0
votes
Explain how you would obtain solid sodium carbonate from a mixture of lead II carbonate and sodium carbonate.
answered
Aug 4, 2021
in
Chemistry Form 2
carbon and its compounds
carbonates
0
votes
An oxide of element F has the formulaF2O5
answered
Aug 4, 2021
in
Chemistry Form 3
the mole formulae and chemical equation
0
votes
The diagram shows the structures of two allotropes of carbon. Study them and answer the questions that follow
answered
Aug 4, 2021
in
Chemistry Form 2
structure and bonding
0
votes
20g of solid sodium hydroxide were dissolved in distilled water and made to 400cm3. 30cm3 of this solution required 27cm3 of dilute sulphuric (iv) acid for complete reaction. [Na=23 O=16 H=1] Determine
answered
Aug 4, 2021
in
Chemistry Form 3
the mole: formulae and chemical equations
0
votes
X+ is an ion with electronic configuration 2,8,8. Identify element X
answered
Aug 4, 2021
in
Chemistry Form 2
structure of the atom and the periodic table
the periodic table
0
votes
When 0.288g of an oxide of metal M was reduced using suitable reducing agent, 0.256 of pure metal was formed. Determine the empirical formula of the oxide of the metal M. [M=64 O=16]
answered
Aug 4, 2021
in
Chemistry Form 3
the mole formulae and chemical equation
determination of formulae
0
votes
Draw a dot and cross diagram showing the bonding in a molecule of calcium oxide. Name the type of bond.
answered
Aug 4, 2021
in
Chemistry Form 2
structure and bonding
0
votes
The figure shows a set-up by a form three student to prepare a certain gas
answered
Aug 4, 2021
in
Chemistry Form 1
water and hydrogen
0
votes
The table below shows the relative atomic masses and the percentage abundance of the isotopes T1 and T2 of element T
answered
Aug 4, 2021
in
Chemistry Form 2
structure of the atom and the periodic table
relative atomic mass
0
votes
write the electronic configuration of calcium (atomic number 20) and magnesium (atomic number 12)
answered
Aug 4, 2021
in
Chemistry Form 2
structure of the atom and the periodic table
structure of the atom
0
votes
Name another gas which is used with oxygen in welding
answered
Aug 4, 2021
in
Chemistry Form 1
air and combustion
oxygen
0
votes
Taja mambo mawili muhimu yaliyosaidia katika maenezi ya Kiswahili Afrika mashariki na kati.
answered
Aug 3, 2021
in
Isimu Jamii
isimu jamii
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