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WorksheetsPractice Quiz: Balancing Equations & Calculations
Total questions: 10
Worksheet time: 20mins
Sodium (Na) burns in oxygen (O2) to form sodium oxide (Na2O).
What is the balanced symbol equation for this reaction?
4Na + 2O -> 2Na2O
4Na + O2-> 2Na2O
2Na2 + O2 -> 2Na2O
2Na2 + 2O -> 2Na2O
Solid sodium metal (Na) reacts with water (H2O) to form an aqueous solution of sodium hydroxide (NaOH) and hydrogen gas (H2).
Which symbol equation is correct?
2Na(s) + 2H2O(l) -> 2NaOH(l) + H2(g)
2Na(s) + 2H2O(g) -> 2NaOH(aq) + H2(g)
2Na(s) + 2H2O(l) -> 2NaOH(aq) + H2(g)
2Na(s) + 2H2O(aq) -> 2NaOH(aq) + H2(g)
Germanium, Ge is extracted from Germanium(IV) oxide by heating with hydrogen.
Balance the symbol equation below for the reaction by writing the missing coefficient.
GeO2 + _H2 -> Ge + 2H2O
(a)
Ethanol (CH3CH2OH) burns in oxygen (O2) to form carbon dioxide (CO2) and water (H2O).
Which one shows the balanced symbol equation for this reaction?
CH3CH2OH + O2 -> CO2 + H2O
CH3CH2OH + 2O2 -> 2CO2 + 3H2O
CH3CH2OH + 3O2 -> 2CO2 + 3H2O
CH3CH2OH + 5-> 2CO2 + 6H2O
Which of the following shows a balanced symbol equation for the reaction of nitrogen (N2) and hydrogen (H2) forming ammonia (NH3)?
N2 + H2 -> NH3
2N2 + 3H2 -> 2NH3
N2 + 2H2 -> 2NH3
N2 + 3H2 -> 2NH3
What is the relative formula mass (Mr) of Mg(OH)2?
(a)
Calculate the relative formula mass (Mr) of ammonium phosphate, (NH4)3PO4.
(Ar: N =14, H = 1, P = 31, O = 16)
(a)
Calculate the percentage composition by mass of nitrogen in ammonium phosphate, (NH4)3PO4.
(Ar: N =14, H = 1, P = 31, O = 16)
Round off your answer to two significant figures.
(Example 1: 14.6 is rounded off to 15)
(Example 2: 12.1 is rounded off to 12)
(a)
Calculate the percentage composition by mass of Aluminium, (Al) in Aluminium oxide, Al2O3?
(Ar: Al = 27, O = 16).
Round off your answer to two significant figures.
26
53
54
63
Strontium carbonate, SrCO3 is a compound used in red fireworks display.
Strontium is the element responsible for the red colour.
Calculate the percentage by mass of Strontium (Sr) in Strontium carbonate (SrCO3)
Ar: Sr = 88, C = 12, O = 16
Round off your answer to two significant figures.
(Example 1: 14.6 is rounded off to 15)
(Example 2: 12.1 is rounded off to 12)
(a)
