Name: ___________________________________ Date: __________________________ Period: _______
Chemistry Review
Directions: Below is the chemical formula for aspirin. Use this formula to answer the questions
below.
2C9H8O4
1. How many elements are in this formula? ___________ Why? ______________________________
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2. How many molecules of aspirin are represented with this formula? _________ Why? ________
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3. How many atoms of oxygen are represented in this formula? __________ Why? ____________
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Directions: Below is a chemical equation for a chemical reaction. Use this equation to
answer the questions below.
N2 + 3H22NH3
4. What is the reactant in this formula? ____________________________________________________
5. What is the product in this formula? _____________________________________________________
6. What are the elements in this equation? ________________________________________________
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7. Do this equation follow the Law of Conservation of Mass? ___________ Why? ______________
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8. What does the arrow in the equation represent? ________________________________________
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9. How many atoms of hydrogen are present on the reactant side? ________________________
Directions: Read the scenario and then answer the questions that follow.
Plants make their own food through a process called photosynthesis. A plant takes in carbon
dioxide (CO2) and water (H2O). The sun provides the energy source to start the chemical
reaction with in the plant. The plant produces sugar (C6H12O6) and oxygen (O2).
11. Write the chemical equation for the chemical reaction of photosynthesis.
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12. What are the reactants in this chemical reaction?
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13. What are the products in this chemical reaction?
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14. Is this equation balanced? __________ Why? ___________________________________________
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Directions: Use the LAW OF CONSERVATION OF MASS to fill out the missing information in the
table below. Use the example as a guide.
Mass of Reactants = Mass of Products
Example:
Reaction
H2
O2
H2O
mass
15.
Reaction
mass
16.
Reaction
mass
17.
Reaction
mass
3.4g
10g
CH4
O2
12.2g
14g
C3H6
O2
18.9g
11.1g
Li
O2
5.7g




13.4g
CO2
H2O
20.0g
CO2
H2O
15.6g
Li2O
24.6g
Directions: Each of the statements below are examples of outcomes that could result during
an experiment. Some of these results are indications of a chemical reaction while others are
not. Label each of the statements that indicate a chemical reaction occurred by placing
the letters CC on the space provided. Place the letter NO on the space provided if the
statement does not indicate a chemical reaction.
______ A solvent dissolves
______ A temperature change
______ A change in state of matter
______ A change in size
______ Bubbles formed
______ A precipitate formed
______ A change in shape
______ Smoking and fumes
______ Sparks or light is emitted
______ No new substance is created
Directions: Fill in the chart.
Signs of a Chemical Change
-
Directions: Identify
each of the following atoms.
--
-
-
-
+
++
+ + ++ + +
-
++
++ +
- +
+ +
++ +
-
-
- -
+
-
+
+
-
+
-
-
-
-
- -
-
-
+
++ +
+ +
+
+
-
-
-
+
++ +
+ +
+
+
-
-
-
-
-
-
-
-
-
Directions: Identify the period and group of each of the atom models below.
-
-
+
+ +
+
-
+ +
-
-
-
-
+
+
-
+
+
-
+
+
Period: ______
Period: ______
Period: ______
Group: ______
Group: ______
Group: ______
What determines the reactivity of an element? ____________________________________________
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How is the periodic table is arranged and how are these arrangements helpful?
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