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An element as 3 isotopes 40/19X(0.01%) 39/19X(93.1%) 41/19X(6.89%). using dots or crosses,draw the atomic structure of X
asked
6 days
ago
in
Chemistry Form 2
by
0769881XXX
structure of the atom and the periodic table
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0
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An element as 3 isotopes 40/19X(0.01%) 39/19X(93.1%) 41/19X(6.89%). using dots or crosses,draw the atomic structure of X
asked
6 days
ago
in
Chemistry Form 2
by
0769881XXX
structure of the atom and the periodic table
0
votes
1
answer
how can i know soluble and insoluble salt
asked
May 10
in
Chemistry Form 2
by
0706247XXX
salts
0
votes
0
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In an experiment an unknown mass of anhydrous sodium carbonate was dissolved in water and the solution made up to 250cm³. 25cm³ of this is neutralised 20cm³ of 0.25M nitric acid. (Na=23.0,C=12.0,O=16.0) calculate a)moles of nitric acid used. b)moles of sodium carbonate in 25cm³ of the solution. c) mass of unknown sodium carbonate level
asked
May 5
in
Chemistry Form 3
by
0768347XXX
the mole: formulae and chemical equations
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votes
3
answers
which method of separation of mixtures is applied in removing fat from milk
asked
May 3
in
Chemistry Form 1
by
0722331XXX
simple classification of substances
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votes
0
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describe how to prepare chloride of aluminium by direct synthesis.
asked
Apr 29
in
Chemistry Form 2
by
0725320XXX
structure and bonding
describe how to prepare chloride of aluminum by direct synthesis
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votes
0
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on complete combustion on oxygen of 0.42grams of gaseous hydrocarbon x,it gave 1.32grams of carbon dioxide and 0.54grams of water determine the empirial formula
asked
Apr 29
in
Chemistry Form 3
by
0740744XXX
the mole: formulae and chemical equations
0
votes
0
answers
calculate amount of moles and pressure of methane
asked
Apr 28
in
Chemistry Form 4
by
0740042XXX
energy changes in chemical and physical processes
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votes
2
answers
how will I obtain pure samples of
asked
Apr 24
in
Chemistry Form 1
by
0700201XXX
simple classification of substances
0
votes
1
answer
prepare solid CuCO3
asked
Apr 21
in
Chemistry Form 2
by
0798093XXX
salts
0
votes
0
answers
how to prepare lead sulphate
asked
Apr 21
in
Chemistry Form 2
by
0798093XXX
salts
0
votes
16
answers
what is chemistry ?
asked
Apr 21
in
Chemistry Form 1
by
0718815XXX
introduction to chemistry
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5
answers
state Charles law
asked
Mar 31
in
Chemistry Form 3
by
sophinenaliakanyongXXX
gas laws
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votes
0
answers
answer the following questions
asked
Mar 22
in
Chemistry Form 2
by
0713784XXX
structure and bonding
0
votes
5
answers
carbon (iv) oxide sublimes at (-78°c)it is called dry ice (a)Why it is called dry ice (b)it is used for keeping ice-cream cold.why it is preferred over ordinary ice? (c)Name other 3 substance that behave like dry ice
asked
Mar 22
in
Chemistry Form 1
by
0713784XXX
simple classification of substances
0
votes
2
answers
describe how you can obtain pure crystal of calcium chloride from a mixture containing aluminium chloride, calcium chloride and lead ( ll) chloride
asked
Mar 22
in
Chemistry Form 1
by
0713784XXX
simple classification of substances
0
votes
3
answers
what is a mole
asked
Mar 20
in
Chemistry Form 3
by
0719355XXX
the mole: formulae and chemical equations
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votes
0
answers
ostward process
asked
Mar 18
in
Chemistry Form 3
by
0702797XXX
nitrogen and its compounds
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votes
1
answer
define molar gas volume
asked
Mar 17
in
Chemistry Form 3
by
0740458XXX
the mole: formulae and chemical equations
0
votes
1
answer
State the grahams law
asked
Feb 11
in
Chemistry Form 3
by
0759082XXX
gas laws
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