How many grams of a 1000-gram radioactive sample are left after 3 half-lives? 1000 grams 500 grams 250 grams 125 grams 2000 grams

Describe the chemical reaction based on the chemical equation below. also, explain whether the equation is balanced.

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.