Answer:
density is defined as the ratio of mass to volume of a object
Answer:
1= 2H₂ + O₂ → 2H₂O
2=CaCo₃ + heat → CaO +CO₂
3=CH₄ + 2O₂ → CO₂ +2H₂O
4=HCl + NaOH → NaCl + H₂O
Explanation:
1 = Simple composition
The formation of water molecule is simple composition reaction. In this reaction two hydrogen atoms react with one oxygen atom and form one water molecules.
2H₂ + O₂ → 2H₂O
The amount of energy released is -285.83 KJ/mol. It is exothermic reaction.
2 = Simple decomposition reaction:
The break down of calcium carbonate into calcium oxide and carbondioxide is decomposition reaction. The decomposition reactions re mostly endothermic, because compound required energy to break.
CaCo₃ + heat → CaO +CO₂
3 = Combustion reaction
Consider the combustion of methane:
CH₄ + 2O₂ → CO₂ +2H₂O
The burning of methane is exothermic. The combustion reactions are exothermic because when fuel are burns they gives energy.
4 = Neutralization reaction
The neutralization reactions are those in which acid and base react to form the salt and the water. Some neutralization reactions are exothermic because they release heat. e.g
Consider the neutralization reaction of HCl and NaOH.
HCl + NaOH → NaCl + H₂O
Answer: Option (a) is the correct answer.
Explanation:
A chair is a solid substance and it is known that particles in a solid are closely held together by strong intermolecular forces of attraction.
Therefore, solids are rigid and have a definite shape.
Thus, we can conclude that the chair in which you are currently sitting retain its same shape over time because the particles of the chair are strongly held together.
It is a combustion reaction. C3H8 will react with oxygen to form carbon dioxide and water.
