Post on 12-Apr-2017
Atoms and Atomic Theory
Essential Questions: How and why has the Atomic Theory changed over time? How can we describe the molecular motion of the states of matter?
Bellwork
Chemical Property Physical Property
Reactivity Cconductivity
Flamibility Density
Specific Heat Ductility
Magnetism
Malleability
Bellwork0Place the Atomic Theory Cards in
order.0 Fill in this chart in your notebook.
Dalton’s Atomic Theory Facts
Explain why you placed these facts in this order. What is your evidence?
Dalton’s Atomic Theory
Atoms are tiny, invisible particles. Atoms of different elements are
different Compounds are formed by combining
atoms. Atoms of one element are the same.
Atomic Theory
Title your page:
TIMELINE
Cut out the atomic models and the words.Match the model to the explanations.DO NOT GLUE!
Atomic Theory Timeline
Scientist Information Model
John Dalton
1808
Matter is formed of small pieces that could not be cut into smaller parts called “atomos” meaning uncuttable.
Scientist Information Model
J.J Thompson
1897
Atoms are made mostly out of (+) charged materials, like dough in a bun. The (-) charged electrons are found inside the (+) dough.
Atomic Theory Timeline
Scientist Information Model
Ernest Rutherford
1911
Atoms have (+) particles in the center, and are mostly empty space. (+) particles called protons, the center of atoms called the nucleus.
Atomic Theory Timeline
Atomic Theory Timeline
Scientist Information Model
Neils Bohr
1913
Improved on Rutherford’s model. He proposed that electrons move around the nucleus in specific layers, or shells. Every atom has a specific number of electron shells.
Scientist Information Model
James Chadwick
1932
Worked with Rutherford to discover particles with no charge – called neutrons. Neutrons are also found in the nucleus.
Atomic Theory Timeline
NEUTRONS
Atomic TheoryChanges over time…
Atomic TheoryChanges over time…
Because Scientific evidence gathered from experiments gave scientists a better understanding of atoms
Think-Pair-Share!
Take a minute to read the essential question as I read it aloud: “How and why has the Atomic Theory changed over time?”After you have jotted down your notes in the space on your guided notes, exchange your thoughts with your partner. We will have share-outs and discuss the answer.
http://www.brainpop.com/science/matterandchemistry/atomicmodel/
Atoms and Atomic Theory
Essential Questions: How and why has the Atomic Theory changed over time? How can we describe the molecular motion of the states of matter?
© Boardworks Ltd 20041 of 20 © Boardworks Ltd 200517 of 25
Three states of matter
solid liquid gas
At room temperature most substances exist in one of three physical states.
Solids0 The particles in a solid are very tightly packed and
vibrate in place. 0 Solids have a definite volume and shape.
© Boardworks Ltd 20041 of 20 © Boardworks Ltd 200520 of 25
Particles in a solid – animation
Liquids0 The particles in a liquid are close together but can
move and flow past one another.0 Liquids have a definite volume but they do not have a
definite shape. This is why liquids like water take the shape of the container they are in.
Picture was taken at the exact moment these water balloons were popped!
© Boardworks Ltd 20041 of 20 © Boardworks Ltd 200522 of 25
Particles in a liquid – animation
Gases0 Particles in a gas have higher amounts of energy than
those in a solid or liquid. 0 Gases do not have a definite shape or volume. When
placed in a container, it fills up the entire container and spreads out as far as possible.
© Boardworks Ltd 20041 of 20 © Boardworks Ltd 200524 of 25
Particles in a gas – animation
Molecular MotionAdding heat
Removing heat
In your groups, you will rotate clockwise after 4 minutes through the 5 stations. You will write all information on the Gallery Walk handout.
Stay with your group at all times. Do not move ahead or go back, wait for the timer to move. You may discuss possible answers with your group
members. Raise your hand if you need assistance after you have
asked your group members.
Independent Practice