SCI 1101 Lecture Notes - Lecture 2: Sodium Chloride, Mass Number, Chemical Energy
Document Summary
Matter, chemistry, and the environment ch 2 lecture. Chemistry: studies types of matter along with how they interact. How gases contribute to global climate change. Pesticide effects on health of wildlife and people. Matter = all material in the universe that has mass and occupies space. The law of conservation of matter = matter can be transformed from one type of substance into others, but it cannot be destroyed or created. It is recycled in nutrient cycles and ecosystems. We cannot simply wish pollution and waste away. A chemical substance with a given set of properties. Atoms = the smallest components that maintain an element"s chemical properties. The atom"s nucleus (center) has protons (positively charged particles) and neutrons (particles lacking electric charge) Electrons = negatively charged particles surrounding the nucleus. Isotopes = atoms of the same element with different numbers of neutrons. Mass number = the combined number of protons and neutrons.
