Hot Sync. Materials Needed Today
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1 Chapter 4 Lesson 1
2 Materials Needed Today Please take these materials out of your backpack. Pencil Blank sheet of paper for notes. Hot Sync Wednesday 1/8/14 Answer the following questions in complete sentences on the hot sync worksheet. 1) Write down everything you know about atoms. (2 sentences) 2) Draw and label a picture of what you think an atom looks like.
3 A quick lesson on atoms
4 Bill Nye!! watch?v=cnjxrfnie5i
5 matter atom nucleus proton neutron electron
6 What is the current atomic model? Matter is everything that has mass and takes up space, such as gases, solids, and liquids. Matter is not sound, heat, or light these are forms of energy. An atom is a very small particle that makes up all matter.
7 Parts of the Atom Atomic-force microscopes show the surfaces of atoms. The nucleus is the region located in the center of the atom. A particle with a positive charge is a proton. A particle with a negative charge is an electron. A neutron has no charge.
8 Parts of the Atom (cont.)
9 Parts of the Atom (cont.)
10 The Size of Atoms Protons, neutrons, and electrons are all smaller than the atom.
11 Historical Evidence of Atoms Democritus ( B.C.) was the first to propose that atoms were indivisible solid spheres with no holes.
12 The Law of Conservation of Mass * Demonstration Steel Wool A chemical reaction rearranges atoms of one substance into another substance with different properties. The total mass of the starting materials is always equal to the total mass of the product.
13 Materials Needed Today Please take these materials out of your backpack. Pencil Blank sheet of paper for notes. Hot Sync Thursday 1/9/14 Answer the following questions in complete sentences on the hot sync worksheet. 1) Give an example of matter and provide evidence that it is matter! (2 sentences) 2) What are the three parts/groups of an atom? (list the charges of each (positive, negative, neutral))
14 The Law of Definite Proportions Any pure compound always contains the same elements in the same proportion. Water from your kitchen is the same as water in a glacier on Mars. H 2 O: two hydrogen atoms and one oxygen atom
15 Dalton s Atomic Model 1. All matter is made up of atoms. 2. Atoms are neither created nor destroyed in chemical reactions. 3. Atoms of different elements combine in whole-number ratios. 4. Each element is made of a different kind of atom. 5. The atoms of different elements have different masses and properties.
16 Dalton s Atomic Model (cont.)
17 1. A 2. B 3. C 4. D Which is NOT a particle in an atom? A positron B neutron C electron D proton 0% 0% 0% 0% A B C D
18 1. A 2. B 3. C 4. D Which law states that the total mass of the starting materials equals the total mass of the product in a chemical reaction? A Dalton s atomic model B the law of conservation of mass C the law of definite proportions D Democritus law A 0% 0% 0% 0% B C D
19 1. A 2. B 3. C 4. D make up the nucleus of an atom. A Protons and electrons B Neutrons and electrons C Protons and neutrons D Neutrons and photons 0% 0% 0% 0% A B C D
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