1. Chemistry of Life

2. Matter is anything that has _______ and takes up ________. mass space rocks soil water bear air trees

3. All matter is made up of ________.atoms An atom is the smallest unit of matter.

4. 0 -1 Atoms consist of three types of smaller particles: _______________ are positively charged (+1) _______________ are neutral (no charge, 0) _______________ are negatively charged (-1) electrons neutrons protons protons neutrons electrons number of protonsnumber of electrons =

6. Aluminum, Al Matter can be composed of an element, a compound, or a mixture. Element – a pure substance made of one type of atom, and it cannot be broken down.

7. There are 109 elements. What makes one element different from another element?

8. 96% of the mass of a human is made of only 4 elements – carbon, hydrogen, oxygen, nitrogen.

9. oxygen You are mostly composed of: carbon nitrogen hydrogen

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

11. CO 2 is composed of __________________ and ___________________ joined by _______________ two atoms of oxygen one atom of carbon CARBON DIOXIDE - - - chemical bonds. CO 2 C O O Chemical formula? Double bonds

12. NH 3 Ammonia is composed of ___________________ and ______________________ joined by _______________ three atoms of hydrogen one atom of nitrogen AMMONIA - - - chemical bonds. NH H H Chemical formula?

13. 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.

14. There are two types of chemical bonds: (1)Covalent bond – chemical bond between atoms in which electrons are shared. Covalent bond O H H

15. There are two types of chemical bonds: (2) Ionic bond – chemical bond between atoms in which electrons are transferred to other atom. Ionic bond Cl - Na +

16. ELEMENT One type of atom

17. COMPOUND Two or more different atoms chemically attached

18. Element or compound? compound element