As technology grows, human needs for new materials also grows. There aren't enough
materials to meet all our needs, so
we make new materials by
existing ones or synthesizing
them in a lab. These materials made in labs are called

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

What happens to the temperature of a substance when the average kinetic energy of its particles increases?

Which change will decrease the number of effective collisions during a chemical reaction? a. adding a catalyst b. increasing the surface area c. decreasing the temperature d. increasing the reactant concentrations e. increasing the volume of the reactants