1. Chemistry of Life

2. All matter is made up of atoms. Matter is anything that has mass and takes up space.

3. protons neutrons electrons

4. Matter can be composed of an element, a compound, or a mixture.

5. Aluminum, Al Element – a pure substance made of one type of atom, and it cannot be broken down.

6. There are 109 elements.

7. 96% of the mass of a human is made of only 4 elements – carbon, hydrogen, oxygen, nitrogen.

8. O HH Compound - a pure substance that is composed of atoms of two or more different elements joined by chemical bonds. Most elements do not exist alone. Elements combine to form compounds.

9. ELEMENT COMPOUND

10. MIXTURE

11. O HH Water, H 2 O Chemical bond The elements that make up a compound are held together by chemical bonds. A chemical bond is a force of attraction between two atoms.

12. There are two types of chemical bonds: Covalent bond Ionic bond

13. (1)Covalent bond – chemical bond between atoms in which electrons are shared. Covalent bond O H H

14. (2) Ionic bond – chemical bond between atoms in which electrons are transferred to other atom. Ionic bond Cl - Na +

15. Acid Base Strongest acid Strongest Base