4. This experiment used Pb(NO3)2 and Ba(NO3)2 in the past. These chemicals have been removed from this experiment and replaced with others such as Na2CO3 to reflect Green
Chemistry Principles. Explain why these chemicals have been removed from the experiment.
You may need to access other resources (books, internet) to help you answer this question.
Please cite any resources used. In addition, identify which green chemistry principles might
apply to your answer.

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block

Juju.01) 5 geologic events a group of students designed an experiment in an ice rink to represent the solar system. the steps of the experiment are listed below. 5: geologic events 1. choose a student to represent the sun. the planets are represented by two tennis balls. 2. ask the student to hold the tennis balls in each palm and spin on the ice with arms stretched out. 3. ask the student to draw in the arms after about 10 spins. 4. observe the student's arms rotate faster when they are closer to the body. 05 geologic events enors) the experiment most likely demonstrates that (2 points) 07 discussion-based sessment/module planets exert gravitational force on the sun the sun exerts gravitational force on the planets 3.07 discussion-based ssessment speed of a planet depends on its distance from the sun new version available! (3.0.119) get it now submit 18.07: module exam description