Name ___________________________________________ Date ____________________ Period ____________________
GUIDED READING – COMPOUNDS
As you read pages 99-102 use information found in the text to completely and neatly answer each question below.
1. What is true of substances that are pure substances but are not elements? ______________________________________
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2. What is the definition of a compound? _________________________________________________________________
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3. List seven examples of compounds given in the book: _____________________________________________________
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4. What are the two methods described that are sometimes used to break a compound into its elements? ________________
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5. Give the name and chemical symbol of the elements would you obtain if you passed an electric current through water?
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6. Clearly explain how the properties of a compound compare to the properties of the elements that make it up.
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7. Give the name, chemical symbol and at least 2 properties of each element that makes up sodium chloride (table salt):
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8. Give at least 2 properties of sodium chloride. _____________________________________________________________
9. What is a molecule? _________________________________________________________________________________
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10. If a molecule of water were broken down into atoms of its elements, would the atoms have the same properties as the
molecule? ________ Convince me ________________________________________________________________________
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11. Explain why a compound is considered a pure substance.____________________________________________________
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12. What is a chemical formula? __________________________________________________________________________
13. Name each element that make up silver nitrate and tell how many atoms of each are in a molecule. _________________
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14. Describe the situation in which a chemical formula does not represent a compound and given at least 3 examples.
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15. What is the chemical formula for chlorine and what exactly does it tell us? _____________________________________
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16. What is a subscript (use glossary)? ____________________________________________________________________
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17. Describe 3 advantages of using a chemical formula explained in the book _____________________________________
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18-27. To show your understanding about both types of pure substances, complete the table below. Use words from word bank.
word bank:
Description of
pure substance
The 100+ simplest
pure substances
Pure substances
made of more than
one element
molecule
N
compound
atom
Types of
pure substances
carbon
H 2O
Example of pure
substance (word)
Smallest
particle
sugar
formula
Name of
shorthand
chemical symbol
element
An example of
using shorthand
28-33. For each substance below, determine if it is an element, mixture, or compound. Record the correct word in the blank.
_______________ salt water
_______________

_______________ table salt
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
_______________ sodium
_______________ 
On Thursday’s quiz you need to be able to:
 -define physical and chemical change, recognize examples of each
 -explain what happens to the particles during a chemical change
 -describe 4 types of evidence suggesting chemical change
 -define mixture, understand what happens to particles in a mixture (such as when salt is being dissolved in water)
 -know what heterogeneous mixture and homogeneous mixture both are, identify and give examples of each
 -explain the law of conservation of matter
 -explain the difference between mixtures and pure substances on a particle basis
 -explain how it is possible that every kind of matter in the universe is made up of only about 100 kinds of atoms
 -define element and compound and understand how they differ from each other
 -give examples of a mixture, an element, and a compound and be able to identify examples given
 -classify matter based on its make-up (given graphic organizer/word bank)
 -define atom and molecule, know how they differ from each other
 -describe the two rules for writing chemical symbols
 -clearly explain what a subscript, such as the 2 in CO2 means
 -given a description or illustration of a compound (number of atoms of each element), write the chemical formula
 -given the chemical formula, illustrate a molecule of the compound
 -describe how the properties of a compound compare to the properties of the individual elements that make it up