Name: ____________________________________________ Date:__________________ Class:_____________
Chemistry Study Guide
Atoms, Compounds, Mixtures and Elements:
1. What is the difference between a compound, mixture and an element?
1a. What is a homogenous mixture – give 3 examples
1b. What is a heterogenous mixture – give 3 examples.
2. Write whether the following are a compound, mixture or element.
a. A bag of jelly beans
b. Sodium
c. Nitrogen
d. Carbon Dioxide
e. Sand
f. Air
3. What is a scientific theory?
4. Fill in the following chart with the date, theory and drawing of the model for
each scientist/ theory.
Date of Discovery
Theory Discovered Model of Theory
John Dalton
J.J. Thomson
Ernest Rutherford
Niels Bohr
Cloud of Electrons
Modern Atomic
Model
5. What is an electron; and where is it located in an atom?
6. What is a proton; and where is it located in an atom?
7. What is a neutron; where is it located in an atom?
Atoms Bonding and Periodic Table:
8. Draw a Lewis Structure and Bohr Model for the following elements.
a. Hydrogen
b. Calcium
c. Bromine
d. Carbon
e. Potassium
9. What role do valence electrons play in the formation of compounds from
elements?
10. Summarize how the periodic table is organized. Be sure to use the words
period and group.
11. Use the terms below to label the following
Symbol
Atomic Number
Atomic Mass
18
Ar
Argon
39.948
12. What are the elements in Group 18 called and how reactive is this group?
Explain this reactivity in terms of the number of valence elements.
Ionic Bonds:
13. Fill in the blanks:
When an atom loses an electron, it loses a ___________________________ charge and
becomes a ___________________________ ion.
When an atom ___________________ an electron, it gains a ___________________________
charge and becomes a ____________________________ ion.
14. Define the following terms
a. Ion:
________________________________________________________________________________
________________________________________________________________________________
b. Polyatomic ion :
________________________________________________________________________________
________________________________________________________________________________
c. Chemical Formula:
________________________________________________________________________________
________________________________________________________________________________
15. What is an ionic bond?
For problems 16-20 use a dot diagram to show how the elements combine to
form an ionic bond. REMEMBER to show the charge of each element AFTER
they bond to form ions. (You might need to use the ion chart in the book!!!!)
16. Sodium+ Iodine
17. Magnesium + Nitrate
Chemical Formula:_______________________
Name:_____________________________________
18. Potassium + Sulfur
Chemical Formula:_________________________
Name:_______________________________________
19. Boron+ Oxygen
Chemical Formula:_________________________
Name:_______________________________________
Chemical Formula:_________________________
Name:_______________________________________
20. Ionic compounds are hard, brittle crystals and have high melting points. Why
do they have high melting points?
20a. Name the following compounds:
CaO _______________________________________________________________
LiSO4 _______________________________________________________________
Mg3(PO4)2 _______________________________________________________________
K3N _______________________________________________________________
20b. Give the chemical formula for the compounds below:
Calcium Sulfide: _______________________________________________________________
Ammonium Fluoride : _______________________________________________________________
Aluminum Chloride : _______________________________________________________________
Sodium Carbonate: _______________________________________________________________
Covalent Bonds
21. What is the force that holds atoms together in a covalent bond?
22. What is a covalent bond?
23. Complete the sentence:
A neutral group of atoms joined by covalent bonds is called
a(n)______________________________________.
24. What are molecular compounds and name three characteristics of them.
For problems 25-29 use a dot diagram to show how the elements form a covalent
bond.
25. O2
26. NBr3
27. H2SO4 (Sulfur is in the middle)
28. C2H2
29. For the following pairs of elements state whether they would form an ionic
or covalent bond.
a. Lithium + Oxygen ____________________________________________________________
b. Sulfur + Chlorine ____________________________________________________________
c. Hydrogen + Chlorine ________________________________________________________
d. Sodium + Nitrogen __________________________________________________________
e. Carbon + Fluorine ___________________________________________________________
f. Magnesium + Fluorine ______________________________________________________
g. Potassium + Phosphorus ___________________________________________________
Observing Chemical Change
30. What is matter?
31. State whether the following are physical or chemical properties
a. Water boils at 100°C _______________________________________________
b.
c.
d.
e.
The ideal pH for fresh water is around 8 _________________________________
Aluminum is shiny _________________________________________________
Iron will rust ______________________________________
The melting point of chlorine is -101.5° C _________________________________