An Overview Assignment

The following questions are designed to give you an idea of how well you know the material we have been covering in class. 

There are two, "Thinking It Over" sections of this assignment that are useful practice questions for the history portion of this unit. The remainder are more directly aimed at Dr. Jansen's class, however, a solid foundation of knowledge is indeed necessary for success in both courses! Good Luck! Try to do as much as you can without opening your textbook!

Section 1

Thinking It Over

1. a) Describe the following scientists and their contributions to atomic theory. Include a paragraph comparing or contrasting the two. 

    Democritus, 400 B.C.E.                     

    John Dalton, 1800s

b) How is a molecule different from an atom? 

2. Describe the following scientists and their contributions to atomic theory. 

     J.J Thompson                                       

(Be sure to include the words: beam, magnet, cathode, anode, neutral, electrons and, positive mass in your answer).

Ernest Rutherford and James Chadwick

(Be sure to include the words: alpha particles, gold foil, empty space, positively charged mass, nucleus, electrons, protons and, neutrons in your answer.) 

  

MATCHING SECTION:  

______ ATOMOS                            A. Has a positive charge. 

______ELEMENT                          B. The centre of an atom. 

______MOLECULE                        C. Holds the nucleus together. 

______NUCLEUS                           D. Has a negative charge. 

______PROTON                             E. Two or more atoms. 

______ELECTRON                         F. Has no charge. 

______ NEUTRON                         G. Greek for "indivisible". 

______ STRONG FORCE                H. Found on the periodic table. 

TRUE OR FALSE:  

1.____ The nucleus contains protons and neutrons. 

2.____ Atoms contain empty space. 

3.____ The chemical formula for water is H2O2. 

4.____ Electrons are found inside the nucleus. 

5.____ The atomic number tells you how many protons an atom has. 

6.____ The elements on the periodic table are arranged by the number of neutrons. 

7.____ Electrons are bigger than protons and neutrons. 

8.____ Electrons move near the speed of light. 

9.____ Different types of atoms can bond together to make molecules. 

ESSENTIAL VOCABULARY: 

Are you able to define these words? 

Elements: 

Atom:

Proton:

Neutron:

Electron:

Nucleus (in chemistry): 

The Strong Force:

Atomic Number:

Atomic Mass:

Molecule:

Alpha Particle: 

Electron Cloud: