How many g of ice at 0 degrees celsius will be melted to water at 0 degrees celsius if the ice absorbs 20000 calories?

Which type of fossil does this image depict?

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays

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