Іі. fill in prepositions where necessary. 1. chemistry is the study matter and its changes. 2. all the matter is composed fundamental units called atoms. 3. the science chemistry is important improving the standards living. 4. the nucleus the atom is composed two particles called protons and neutrons. 5. chemistry provides employment a large variety people. 6. the simplification chemical problems is made classifying matter. 7. the behavior the four forms matter can be explained the fact that all matter consists particles motion. 8. the universe is made more than 90 elements. 9. chemistry involves the study chemical elements and how they combine.

  1. Chemistry is the study of matter and its changes.
2. All the matter is composed of fundamental units called atoms.
3. The science of chemistry is important for improving the standards of living.
4. The nucleus of the atom is composed of two particles called protons and neutrons.
5. Chemistry provides employment for a large variety of people.
6. The simplification of chemical problems is made by classifying matter.
7. The behavior of the four forms of matter can be explained by the fact that all matter consists of particles in motion.
8. The universe is made of more than 90 elements.
9. Chemistry involves __ the study of chemical elements and how they combine.