First structure is CH₃-CH₃. It is an alkane with two carbon atoms hence it is called ethane.
Second structure is CH₃-CH₂-CH₂-CH₃. It is an alkane with four carbon atoms hence it is called butane.
Third structure is CH₄. It is an alkane with one carbon atom hence it is called methane.
Fourth structure is CH₃-CH₂-CH₃. It is an alkane with three carbon atoms hence it is called propane.
Ions have an extra or lost an electron. Isotopes have different numbers of neutrons.
Answer:
Non-zero digits are always significant
Ph = A
Acid = C
Base = D
Litmus paper = B
Term = ?
