What type of chemical solution takes place when
a) magnesium wire is burnt in air
b) lime stone is heated
c) silver bromide is exposed to sunlight
d) electricity is passed through water
e) ammonia and hydrogen chloride are mixed
Answers
Answer:
a). Combination reaction
b). Decomposition reaction
c). Decomposition reaction
d). Decomposition reaction and endothermic reaction.
e). Combination reaction
Explanation:
a).
Answer: When magnesium wire is burnt in air, it reacts with oxygen to form magnesium oxide.
2Mg(s) + O2(g) -----> 2MgO(s)
It is a combination reaction.
b).
Answer: When lime stone is heated, it produces two compounds are calcium oxide and carbon dioxide gas.
CaCO3(s) --∆---> CaO(s) + CO2(g)
It is a decomposition reaction.
c).
Answer: When silver bromide is exposed to sunlight, it produce two substances are silver and bromine.
2AgBr(s) ----> 2Ag(s) + Br2(g)
It is a decomposition reaction due to the light.
d).
Answer: When electricity is passed through water, it produce two gases are Hydrogen gas and Oxygen gas.
2H2O(l) -----> 2H2(g) + O2(g)
It is a decomposition reaction due to electric current. It is also an endothermic reaction.
e).
Answer: When ammonia and hydrogen chloride are mixed, Ammonium Chloride and Water are formed.
HCl(g) + NH3(s) -----> NH4Cl(s)
It is a combination reaction.