If 90.0 g of sodium is mixed with 40.0 g of nitrogen gas, what mass of sodium nitride forms?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

When a nucleus absorbs a neutron and then breaks apart, there are many products of the reaction. what is not a product of a nuclear fission reaction

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.