Name:_______________________________
Core:________________________________
Date:________________
Directions: Completely read through each page of the website provided. To
answer the following questions, read through each topic and use complete and
thoughtful sentences. Everyone must turn in their own work.
Compounds
1. Which of the following sentences best describes the number of possible
compounds that can be made?
a) There are less compounds then there are elements, so less than 100
possible compounds are known
b) Elements only sometimes join together to form compounds, and only a
thousand or so compounds exist
c) There are countless different ways the elements can join, and so
there are millions and millions of possible compounds elements that
can form
2. In your own words, describe how the formation of a compound effects the
properties of the elements the compound is made of (2-3 sentences). You
should use an example to support your explanation.
_________________________________________________________
_________________________________________________________
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3. How are the atoms of compounds held together? What were the 2 types we
learned about in class? (not listed in the website)
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_________________________________________________________
_________________________________________________________
4. What process is required to join or separate the different elements of a
compound?
a) Filtration- Using a filter to separate two substances
b) Chemical reaction- Linking different elements together or breaking
them apart
c) Distillation- Heating a substance to separate a liquid from a solid
5. Please give an example of an element that will always remain as separate,
single atoms, meaning it will never form a molecule:
_____________________________
6. Explain why a compound will always exist as a molecule, and not as a single
atom (2-3 sentences)
_________________________________________________________
_________________________________________________________
_________________________________________________________
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Chemical Formulae
7. Explain the difference between writing CO (both capital letters) and Co (one
capital and one lower case) and why it is important to know the difference
(2-3 sentences)
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8. How do we show that a chemical formula has more than one atom of the
same element?
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_________________________________________________________
________________________________________________________
9. Which of the following is correct chemical symbol for carbon dioxide?
(1 carbon atom and 2 oxygen atoms)
CO2
C1O2
C2O
CO2
10. How many atoms of each element are in the following chemical formulae?
Na2SO4- Na______
S_______ O_______
C6H12O6 - C_______ H_______ O_______
11. The chemical formula for water is H2O. How do you know H2O2 is not water?
_________________________________________________________
_________________________________________________________
_________________________________________________________
The Reactivity Series
12. In your own words, explain the difference between reactive and unreactive
(2-3 sentences)
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Mixtures
13. In your own words, please describe a mixture (2-3 complete sentences)
_________________________________________________________
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14. Complete the following table:
Mixture
Compound
Composition
Joined or
not
Properties
Separation
Examples
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Checkpoint
15. Fill in the blanks:
a. An element contains _____________________________________
b. A compound contains ____________________________________
________________________________________
c. A mixture contains
_______________________________________ that are
__________________________________
d. The different substances in a mixture can be
____________________________________________________
Complete the chart on the next page!!!!!!!!
Page 5 of 6
16. Draw the atoms or molecules for the following (use colored pencil or shading
so you can tell the difference between each element)
Description
Example Diagram
Pure element
oxygen
Pure compound
carbon
dioxide
Mixture of elements
oxygen
and
helium
Mixture of
alcohol
compounds
and
water
Mixture of elements
air
and compounds
Page 6 of 6