Presentation on theme: "Biochemistry Notes. Elements and Atoms Matter is anything that has mass and takes up space. Atoms are the basic building blocks of all matter. Elements."— Presentation transcript:
Elements and Atoms Matter is anything that has mass and takes up space. Atoms are the basic building blocks of all matter. Elements are basic substances that cannot be broken down into other substances. Molecules are formed by the joining of atoms of two or more elements. (smallest combination that cannot be divided without changing its chemical and physical properties) Compounds are composed of atoms of different elements chemically combined.
Atoms The center of an atom is called the nucleus. Consists of three subatomic particles called: Protons: positive charge Neutrons: neutral/no charge Electrons: negative charge 1st level can hold 2 electrons 2nd level can hold 8 electrons 3rd level can hold 8 electrons
Periodic Table 12 Mg Magnesium 24.305 Atomic Number: Protons Symbol Element Atomic Mass Number: Protons + Neutrons (Nucleus) QUESTION: What part of the atom gives the atom its mass??
Periodic Table 12 Mg Magnesium 24.305 Protons + Neutrons Protons = Electrons In a neutral atom
Chemical Equations CH 4 + 2O 2 CO 2 + 2H 2 O Products Reactants LIGHT ENERGY CO 2 + H 2 O + LIGHT ENERGY C 6 H 12 O 6 + O 2 Equation for Photosynthesis 666
Inorganic Substances Acids: substances that forms hydrogen (H) hydrogen ions in water. pH of 0-7. Bases: substance that forms hydroxide ions (OH) in water. pH scale of 7-14. Salts: Inorganic substances that typically contain Chlorine. NotContaining Carbon HCl H 2 SO 4 NaOH KOH NaCl MgCl 2