URGENT HELP PLS Determine the percent composition by the mass of oxygen in the compound C6H12O6

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

Determine the reaction and balance the following equations urgent due in the morning

Which of the following is not true about the atomic model of substances?