Mid-Summative Exam 1 – 2
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1.
Period:
List the three ways that a substance is identified on its label.
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2.
What is the difference between Co and CO?
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3.
What elements are found in the following substances?
Substance
Water
H2 O
Sodium chloride
NaCl
Ozone
Sodium bicarbonate
Carbon dioxide
4.
Chemical Formula
Elements
O3
NaHCO3
CO2
How are elements and substances related? (Make sure to explain both words!)
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5. Why did Mendeleyev change the layout of the elements from one long row into rows
and columns? (Choose the one best answer.)
A. He wanted it all to fit on one page instead of in a long line.
B. He put elements with similar characteristics in the same column.
C. He ordered them from the lightest to the heaviest elements.
D. He put all the metals on one side of the table.
When Mendeleyev changed the layout, there were gaps. How did the gaps help
scientists?
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6. What is a chemical reaction? (Give the definition.)
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List three types of evidence that a chemical reaction has occurred.
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