Short pea plant maybe form from tall pea plant why

Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane

Compare and contrast the bohr model and the electron cloud models of the atom.

In salt water solution,the salt is the blank