WorksheetsScience Quiz
Total questions: 8
Worksheet time: 4mins
The symbol (v) is written below to the right of the molecular formula of the compound that exists in the state.
solid
liquid
vapour
aqueous solution
What is the symbol that is written below to the right of the molecular formula of the aqueous solution of sodium hydroxide?
(s)
(l)
(aq)
(g)
Which equation correctly represents the physical states of reactants and products in the reaction of adding dilute hydrochloric acid to a strip of magnesium?
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
Mg(s) + 2HCl → Mg(s) + 2HCl
Mg(s) + 2HCl(aq) → Mg(s) + 2HCl
Mg(s) + 2HCl → MgCl2(aq) + H2(s)
All the following describe the reaction: 2Mg + O₂ → 2MgO, except.
the reaction does not occur without heating.
the reaction is followed by the formation of new bonds.
a white substance forms at the end of the reaction.
the mass of the reactants is greater than the mass of the products.
Which of the following equations expresses a reaction that can be indicated by the evolution of gas?
Zn + 2HCl → ZnCl₂ + H₂
2Mg + O₂ → 2MgO
AgNO3 + NaCl → NaNO3 + AgCl
Zn + CuSO₄ → ZnSO₄ + Cu
Which of the following chemical equations verifies the law of conservation of matter?
N₂ + H₂ → NH3
6NO + O₂ → NO₂
H₂O + H₂ → O₂
KCl + AgNO3 → AgCl + KNO3
According to the law of conservation of mass, the total mass of the reactants in a reaction is
a double the total mass of the products.
b greater than the total mass of the products.
equal to the total mass of the products.
d less than the total mass of the products.
When 12 g of carbon burns in pure oxygen, 44 g of carbon dioxide is produced. What is the mass of oxygen consumed in the combustion?
22 g
8 g
16 g
32 g
