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Worksheetschemical formula and equation
Total questions: 15
Worksheet time: 28mins
What is the correct way to write the formula for the model of this compound?
2H20
2H2O
2HO2
H2O2
The formula of silver nitrate is
AgNO3
Ag2NO3
Ag(NO3)2
The name of Cu(OH)2 is
copper hydroxide
copper(I) hydroxide
copper(II) hydroxide
When 0.23 g of sodium, Na is added to water, the metal will react vigorously at the surface of the water, find the mass sodium hydroxide, NaOH produced.
RAM Na= 23, O= 16 , H= 1
0.2g
1.3g
0.4g
4.7g
Fe + O2 -> Fe2O3
Mg + __HCl ---> MgCl2 + H2
2 Na+ _ Cl2 -> 2 NaCl
The formula of carbonate ion and sulphate ion is CO32- and NO3- respectively. If the formula of carbonate salt is J2CO3, then the formula of nitrate salt of J is
JNO3
J2NO3
J(NO3)2
J2(NO3)3
What is the mass of nitrogen with 3.01 x 1023 molecules of nitrogen?
[Relative atomic mass: N = 14; NA = 6.02 x 1023 mol-1]
3.5 g
7 g
14 g
28 g
The diagram shows the apparatus set up to determine the empirical formula of magnesium oxide.
Which of the following is the reason why the lid should be lifted and closed quickly and occasionally during the heating?
To prevent pressure from building in the crucible
To prevent the crucible from cracking
To prevent the white fumes from escaping
To prevent condensation from occurring in the crucible.
