Download Midterm Review 1

Chemistry - Mid Term Exam Review Sheet #1
The midterm exam covers chapters 1 - 8 & 10. You should read through each chapter, look over old tests you still have,
answer the following questions and do the calculations in order prepare yourself for the mid-term.
1. Define the following terms and describe where each is located.
proton -
_____________________________________________________________________________
neutron -
_____________________________________________________________________________
electron –
_____________________________________________________________________________
2. Complete the following table:
Element name
Atomic #
Hydrogen
Mass #
# of protons
# of Neutrons
# of Electrons
Symbol
Carbon
Sodium
Calcium
Fe
3. Define the following and give an example of each using chemical symbols.
atomic number _______________________________________________________ / __________________________
atomic mass
_______________________________________________________ / __________________________
isotope
_______________________________________________________ / __________________________
19
20
19
4. Which of the following are isotopes of the same element?
9Y
9Y
10Y
5. Describe Rutherford's experiment: ___________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
6. Explain all the major parts of Dalton's Atomic Theory.
a.
b.
c.
d.
7. Balance the following chemical equations:
3 CO + _____ Fe2O3 
2 Fe
3 Zn(OH)2 + 2 H3PO4 
_____ Zn3(PO4)2
+ 3 CO2
+ 3 H2O
8. Define Ionic and Molecular compounds, and tell how each is formed.
a. Ionic: oppositely charged particles creation bonds that are formed when electrons transfer
b. Molecular; Bonds formed when atoms share electrons to complete their valence level
9. Name the following compounds and state if it is ionic or molecular in nature:
a. Al(OH)3
aluminum hydroxide - ionic
b. N2O5
dinitrogen pentoxide - molecular
c. MgI2
magnesium iodide - ionic
d. Cl2O7
dichlorine heptoxide
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Chemistry - Mid Term Exam Review Sheet #1
10. Write a chemic al formula for each name given and tell whether it is an ionic (i) or molecular (m) compound:
a. Ammonium Phosphate
_______________ (NH4)3PO4 - I
b. Magnesium Nitride
_______________ Mg3N2 - I
c. Oxygen Difluoride
_______________ OF2 - M
d. Carbon Dioxide
_______________ CO2 - M
e. Sulfur Dioxide
_______________ SO2 - M
11. Name and describe the 6 types of chemical reactions. Give an example of each.
a. : smaller species combine into larger ones – 2H2 + O2  2H2O
b. Combination Decomposition: larger species breaking down into smaller ones – MgCl2  Mg + Cl2
c. Single replacement: an element and a compound react and create a different element & compound a + bc  b +
d. Double replacement: Ions from two ionic compounds swap places to make two different ionic compounds
e. Usually involve oxygen reacting with a fuel producing H2O & CO2 –
CH4 + 2O2  CO2 & 2H2O
f.
12. Define and give an example of each:
Element
_____________________________________________________ / _________________
Mixture
_____________________________________________________ / _________________
Compound
_____________________________________________________ / _________________
homogeneous substance
_____________________________________________________ / _________________
heterogeneous substance
_____________________________________________________ / ________________
physical property
_____________________________________________________ / _________________
chemical property
_____________________________________________________ / _________________
physical change
_____________________________________________________ / _________________
chemical change
_____________________________________________________ / _________________
qualitative measurements
_____________________________________________________ / _________________
quantitative measurement
_____________________________________________________ / _________________
13. Which of the following is a homogeneous mixture?
a. oil in water
b. soot in water
c. alcohol in water
14. Which of the following could be considered a physical change?
a. cooking a pancake
b. burning a tree
c. melting an ice cube
15. Which of the following is considered a heterogeneous mixture?
a. salt and sugar
b. flour and baking powder
c. salt and pepper
16. Classify each as a physical or chemical change.
______ a. instant coffee is combined with hot water to produce a brown liquid
Physical
______ b. from exposure to air and moisture, iron turns reddish and cannot conduct electricity
Chemical
______ c. iron is heated , turns red and then melts
Physical
______ d. sugar is heated to produce steam and a black solid
Chemical
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