process of slowly adding a solution to react with another solution and determine the concentration of one of the solutions based on the reaction between them:

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

In one or two grammatically correct sentences, write a definition for the term molecule geometry

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold