Do Now: (3 min) Lauren was cooking pasta in the pot. When it’s done cooking, she needs to separate the pasta from the water. What separation technique.

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Presentation transcript:

Do Now: (3 min) Lauren was cooking pasta in the pot. When it’s done cooking, she needs to separate the pasta from the water. What separation technique does she use and why? In order to get points for your Do Now, bring it up to the front to get checked off

Do Now Discussion Lauren was cooking pasta in the pot. When it’s done cooking, she needs to separate the pasta from the water. What separation technique does she use and why? Filtration! She’s removing a solid from a liquid!

The Atom 10/20/09 Video notes, Stations

The Atom The smallest particle of an element that retains all the properties of that element – the building block of everything! Today we are learning about: The history of the atom The experiments used to make models The current model and structure of the atom

Today’s Agenda 1. Video on the Atom 2. Stations: Parts of the Atom 3. Discussion and summary 4. Reflection

Video: History of the Atom Very quick (5 minutes) Pay attention because the information will be useful to you in the next activity If we find it hard to pay attention – we can take cornell notes instead

Stations: Parts of the Atom In your notes, divide a sheet of paper into four sections (one section for each station0 Work in groups of 2 of your choice 4 minutes at each station to complete the following tasks: 1.READ ALL of the information at the station 2.Answer the questions at the bottom of each station (on the back of our notes sheet) 3.Fill in the blanks on our notes sheet that we missed during the video NOTE: If the work does not get done, we will lose the opportunity to choose our partners in the future. If you finish early – keep working at the same station (make your answer better!)

What have we learned? (short cornell notes) Atom: The smallest particle of an element that retains all the properties of that element Cathode Ray Experiment: discovery of the electron Gold Foil Experiment: ◦ Particles pass through foil  atoms are mostly empty space ◦ Particles bounce off  atoms have a solid center called the nucleus Today’s Model: ◦ Proton – in the nucleus, positive charge ◦ Neutron – in the nucleus, neutral (no charge) ◦ Electron –outside of the nucleus, negative charge.

Reflection: At the bottom of your notes, write about what you learned today: What are TWO things you learned today you didn’t know before? What topics do you find confusing? What questions do you have?

The Atom The smallest particle of an element that retains all the properties of that element Atoms are too small for us to see, but we know they are made of three types of particles: the proton, the neutron, and the electron. Scientists use experiments to get clues to construct models

Atomic Theory (the first model) John Dalton Main points ◦ Atoms are small parts that make up atoms ◦ Atoms of a specific element are different from those of another element ◦ Atoms cannot be  created nor destroyed  divided into smaller parts

Experiment 1: The cathode ray J. J. Thompson Noticed when you placed a magnet near a cathode ray, it BENDS Means the particles in the ray must be negatively charged!

Plum Pudding Model J. J. Thompson Discovered the electron (negatively charged particle) Because matter is neutral, it must have both positively and negatively charged particles Proposed a model where electrons are like chocolate chips

Gold Foil Experiment Ernest Rutherford Shot positively charged particles at thin sheet of gold foil Most particles passed through  ATOMS ARE MOSTLY EMPTYSPACE Some particles bounced off  atoms have a positively charged mass called the NUCLEUS

Today’s Model: Parts of the Atom The Proton: ◦ Positively charged (1+) ◦ Located in the nucleus The Neutron: ◦ No charge (0) ◦ Located in the nucleus The Electron ◦ Negatively charged (1-) ◦ Move around the nucleus in the electron cloud

Reflection Write your name, date and period on a separate sheet of paper and answer the following questions: 1. Define an atom in your own words 2. What subatomic particle did JJ Thompson discover and what does it look like in the Plum-Pudding Model? 3. In the gold foil experiment, most particles passed through the foil. What does that say about atoms? 4. In the gold foil experiment, some particles bounced off. What does that say about atoms? 5. A proton is ____________ charged and is located ______________. 6. A neutron is __________ charged and is located _______________. 7. An electron is _________ charged and is located __________________.