Name: _____________________________ Class Period: _______ Due Date: ______
Unit 2 – What are we made of?
Unit 2.1 Test Review
TEKS covered:
8.5A describe the structure of atoms, including the masses, electrical charges, and locations of protons,
electrons and nucleus
8.5B identify that protons determine an elements identity and valence electrons determine its chemical
properties, including reactivity
8.3B use models to represent aspects of the natural world
8.5C interpret the arrangement of the periodic table, including groups and periods, to explain properties
that are used to classify elements
Reviewed TEKS –
6.5A know that an element is a pure substance represented by chemical symbols
6.5C differentiate between elements and compounds on the most basic level
6.6A compare metals, nonmetals, and metalloids using physical properties such as luster, conductivity, or
malleability
6.6B calculate density to identify an unknown substance
IB Criterion that will be on this test:
Criterion A: Knowing and Understanding
i. describe scientific knowledge
ii. apply scientific knowledge and understanding to solve problems set in familiar and unfamiliar
situations
iii. analyze information to make scientifically supported judgments
Beginning Chemistry:
1. What is matter?
2. What is the difference between an element, compound and mixture? Give definitions of
each.
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3. Choose whether the following are chemical or physical changes. Write chemical or
physical in the blank:
a. ____________________ tearing a piece of paper
b. ____________________ chocolate melting
c. ____________________ steam from boiling water
d. ____________________ fireworks being set off
e. ____________________ painting a wall a new color
f. ____________________ silverware tarnishing
4. Label
a.
b.
c.
d.
e.
f.
the following as an element, compound or mixture
_________________ water, H20
_________________ lemonade
_________________ gold bracelet
_________________ chocolate cake
_________________ ammonia, NH3
_________________ pizza
5. Describe the structure of an atom, explain the particles, their charges and where they
are located.
6. How is a neutral atom identified?
7. What is the type of isotope that has a positive charge? ________________
8. What is the type of isotope that has a negative charge? _______________
Use the periodic table “square” and your periodic table to answer questions 9-14:
9. What is the atomic mass? _____________
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10. What is the element’s symbol? ______
V
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11. What is the atomic number? ________
12. What is the element’s name? _________
13. What is the number of protons _________ number of electrons _________ and
number of neutrons _______ ?
14. If you looked up this element on the periodic table, what category or type of element
is it? ___________________________
15. Circle and label the periodic table with the 3 main categories of elements.
16.How are elements arranged on the periodic table? There are several possible answer to
this one!
17. List the descriptive properties of metals, nonmetals and metalloids:
Metals –
Nonmetals –
Metalloids –
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18. What are columns on the periodic table called and why do they have similar chemical
and physical properties?
19.What are the horizontal rows on the periodic table called?
20. What happens to the reactivity of metals when you move from left to right on the
periodic table?
21. What happens when you look at the metals as you go down the group?
22. Explain valence electrons:
23. Do noble gases react well with other elements? Why or why not?
24. Draw the Bohr models for 2 atoms that are in the same group on the periodic table:
25. What is the atomic theory and who “discovered” it?
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26. Find the percentage of how frequently each element occurs on Earth:
Major Elements of Earth –
Iron (Fe) _____________
Oxygen (O) ____________
Silicon (Si) _____________
Magnesium (Mg) _________
Nickel (Ni) ___________
27. The model of the periodic table below shows the location of four elements.
If an element has the properties
of being ductile and shiny, as well
as conducts heat, which section(s)
of the table would it be found in?
___________________
28. Why are metalloids used so often in electronic equipment such as computers?
29. What is the mass number of an atom that has 9 protons, 9 electrons and 9 neutrons?
____________________
30. What is the name of this element? ________________________________
31. Calculate density of an object that has the mass of 250g and the volume of 12ml:
32. What is the part of an atom that determines an atom’s identity? ___________
33. Here are two models of the same substance. How do you know if this is an element or
a compound?
Explain here: ___________________
______________________________
______________________________
______________________________
______________________________
34. Find the number of electrons in the following elements: Si _______, Ar _____,
K _____, and Mg _______
35. What pages in the textbook will be the most helpful to you to prepare for this test?
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Study Tips and Reminders:
1.
2.
3.
4.
Complete this test review and then study!
Get someone to quiz you!
Notes are always posted on the website
Remember, the “Unit Enrichment and Review” section at the bottom of every unit
has even more videos and links.
5. The labs and their concepts turn into questions on the test! Take a look at the
physical properties lab and notice how to calculate density of an unknown object,
and the properties of metals and non-metals.
6. Know how to use the periodic table to find out things about the elements – in
particular, know how to figure out mass, number of protons and neutrons, why an
element is located where it is on the table and how the valence electrons are
found.
To learn more about the history of atoms, go to these links (these are also posted on my
website):
1. https://www.texasgateway.org/sites/default/files/resources/documents/EvolutionO
fAtomicModel.pdf
2. Quizlet: https://quizlet.com/_2hw40r
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