Please help me i dont understand

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

How do you know when a chemical reaction has occurred

How many moles of oxygen gas are produced from the decomposition of six moles of potassium