Which change in state requires that energy be added to the substance?

Which type of reaction always has an element and a compound as reactants

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

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