Homework 2

2009 - 2010

Homework 2: 8/27/09 - 9/04/09

Mr. Sam Harrelson MS Room 312 Email: [email protected] Tel: 864-381-7374 (or 864-381-SDSG) http://griffinscience.com

Following are the six objectives we’ll be learning this week as a part of our study of Physical Science. More information can be found on GriffinScience.com and feel free to email or call me with any questions you might have! Mr. Harrelson -Important Terms: Atom

Proton

Neutron

Electron

Isotope

Energy Level

Atomic Number

Mass Number

Nucleus

Atomic Mass

Period

Group

Chemical Symbol

Plasma

Nuclear Fusion

Periodic Table

-Objective 1: Describe how atomic theory developed and changed. Objective 2: Describe the modern model of the atom. Objective 3: Explain how Mendeleev discovered the pattern that led to the periodic table. Objective 4: Tell what information about elements is found in the periodic table. Objective 5: Understand how the properties of individual atoms determine their placement on the periodic table. Objective 6: Explain how elements are created in stars.

Physical Science - Grade 8 - Syllabus 2009-2010

1

2009 - 2010

Homework 2: 8/27/09 - 9/04/09

Objective 1: Describe how atomic theory developed and changed. 1. Briefly, what were the main ideas of John Dalton’s atomic theory? 2. What did J.J. Thomson discover about atoms? 3. What is a good analogy for Thomson’s model of the atom? 4. Ernest Rutherford’s model differed from Thomson’s model of the atom because of the gold foil experiment. What did Rutherford and his team observe? 5. What did Niels Bohr revision of the atomic model include? Objective 2: Describe the modern model of the atom. 1. Instead of orbiting the nucleus, what did scientists discover about electrons in the 1920’s? 2. Describe an energy level. 3. Describe the modern model of the atom. 4. What did James Chadwick discover in 1932? 5. How does the atomic number and mass number differ? 6. Compare the mass of electrons, protons and neutrons. Which has the most mass? Which has the least? 7. What is an isotope? Please give an example. Objective 3: Explain how Mendeleev discovered the pattern that led to the periodic table. 1. How did Mendeleev find the pattern that lead to the periodic table? 2. What is the atomic mass? 3. What did Mendeleev notice about the properties of elements when he used atomic mass to order them? 4. How many elements did Mendeleev have on his first periodic table? 5. How does the modern periodic table differ from Mendeleev’s? Objective 4: Tell what information about elements is found in the periodic table. 1. What does “periodic” mean?

Physical Science - Grade 8 - Homework 2

2

2009 - 2010

Homework 2: 8/27/09 - 9/04/09

2. Who discovered the atomic number? How did that discovery change the way elements are placed on the periodic table? 3. What is a period? 4. What is a group? 5. What is a chemical symbol? Objective 5: Understand how the properties of individual atoms determine their placement on the periodic table. 1. Describe where metals, non-metals and metalloids are generally found on the modern periodic table. 2. What does each element square on the periodic table normally include? 3. Besides English, what other language might a chemical symbol be? 4. Where are the lanthanides and actinides found on the periodic table? 5. What does the average atomic mass consist of? Objective 6: Explain how elements are created in stars. 1. What is plasma? 2. Why do the positively charged protons of atoms collide in stars (since they normally repel one another)? 3. What is nuclear fusion? 4. How does nuclear fusion create heavier elements? 5. What stage of a star’s life produces the heaviest elements?

Physical Science - Grade 8 - Homework 2

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