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Answer:
Silver tarnishes and becomes black when exposed to oxygen:
Diesel fuel burns when it is heated:
Explanation:
Chemical Changes are those changes in which the chemistry at molecular level is changed as the starting material is converted in to a new and different final material. This change takes place with the breaking of old bonds and forming of new bonds respectively.
Silver tarnishes and becomes black when exposed to oxygen:
This is a chemical change as Silver a white and lustrous starting material is being converted into a tarnish black final material. However, Silver doesn't readily react with oxygen at normal conditions. It readily react with Sulfur containing compounds in air and produces black compound as Ag₂S.
Diesel fuel burns when it is heated:
Diesel is a mixture of hydrocarbons ranging approximately from C₁₀H₂₀ to C₁₅H₂₈. When these hydrocarbons are burnt they produces a new materials i.e. CO₂ and H₂O.
C₁₀H₂₀ + 15 O₂ → 10 CO₂ + 10 H₂O
Hence, it is also a chemical reaction.
Water=h20
=2.0*10^22 molecules
Answer: 65.28 g of 
will be produced from 34.6 g of Al.
Explanation:
To calculate the moles :
The balanced chemical reaction is
According to stoichiometry :
4 moles of 
produce = 2 moles of
Thus 1.28 moles of produce=
of
Mass of ![[tex]Al_2O_3](https://tex.z-dn.net/?f=%5Btex%5DAl_2O_3)
= 
Thus 65.28 g of will be produced from 34.6 g of Al.
