WHAT IS BIOLOGY?????

Definition Bio - __________ Logy - ____________ Biology - ____________ The science of life

Biochemistry Section What is the smallest unit of matter? ATOMS – Composed of three different types of particles Proton – _________ Neutron – ________ Electron - ________

Protons, Neutrons, Electrons All small in size and mass Mass of electron is negligible Number of protons = _______ - Charge __ Number of electrons = ______ - Charge __ Neutrons = ______ - Charge __

Cont’d Does increasing the number of protons and electrons increase the atomic mass?

Elements An element is a pure substance that can not be broken down further There are over ____ types of elements, ___ are naturally occurring. Each element has its own ____ and_______. 6 C Carbon

Periodic Table Page 149 in book Also can find as a separate handout Rows - ______ Columns - ________ Grouped according to their physical and chemical properties.

What structure is this?

Isotopes Different number of ______. Same number of ________ and _______. Therefore isotopes are the same element, just different _________. Ex. Carbon C-12 C- 13 C -14 Which is most abundant?

Radioactive Isotopes Changing the number of ______ causes an atom to _____. Once it _______ it emits radioactive particles. This is used in imaging or radiation therapy.

Make a Graph Use a sheet of paper and develop a graph that best fits the area on your sheet of paper using proper scale sizing. - Show the radioactive decay of P-32 over a 2 week period. Plot the time in weeks on the x-axis and the % of P-32 on the y- axis. (% should be from %)

What is a compound? It is the pure substance formed when _________ different elements come together. Ex. NaCl – Table salt H 2 0 – Water AlPO 4 _________

Types of Chemical Bonds Covalent Bonds - ________________ Ionic Bonds - _________________ Van der Waals Forces - ______________

Covalent Bonds A molecule is ________________.

Ionic Bonds An ionic bond is the _______ between ions of ________ charges. Give an example - _________

Van der Waals Forces What is a van der waals force? How strong is it? How does this force play a role in water?

Vocabulary Atom Compound Nucleus Molecule Proton Ion Neutron Ionic bond Electron Van der Waals force ElementIsotope Covalent bond

Homework Directions: Answer these 4 questions on a separate sheet of paper and turn in August 6, 2008 at the beginning of the period. Work accepted after the bell will be considered late. 1. Draw Ne atom. Label where the electrons, protons, and neutrons are located. Tell how many of each there are. 2. Is carbon dioxide CO 2 an element or compound and explain why? 3. If Boron has 5 protons in its nucleus how many neutrons are there? How many electrons? What if B-7 was an isotope, how many neutrons are present in this atom? 4. How does an atom fill its electron orbital's? Give an example of how Argon fills its orbital's.

Homework Read over chapter 6.1 Familiarize yourself with the Periodic Table Study for Lab Safety Test on Thursday Preview: Reactions