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1.2 District On-Level Exam (TEKS 6.5ABC)
2014 - 2015
1. Which of the following is an element? (6.5A)
A.
B.
C.
D.
H2O2
O2
HCl
C6H12O6
2. Which of the following is the best explanation of an element? (6.5A)
I. A substance that cannot be broken down into simpler substances
II. A naturally occurring mineral made of more than one substance
III. A small particle made with a specific chemical composition
IV. A collection of atoms that have different abilities when joined
together.
A.
B.
C.
D.
I only
I and II only
II only
III and IV only
3. A group of students are distinguishing between elements, compounds, and
mixtures. Which substance below would be categorized with’ Pure
Substances’. (6.5A, 6.3B)
4. Two elements make up about 75% of the mass for all elements found in
Earth’s crust. The two most abundant (common) elements found in Earth’s
crust are? (6.5B)
A.
B.
C.
D.
Silicon and Aluminum
Chlorine and Sodium
Iron and Oxygen
Oxygen and Silicon
5. Which graph below best shows the composition of Earth’s atmosphere? (6.5B)
A
C
B
D
6. Which statement is the best comparison of elements and compounds? (6.5C)
A. Elements are pure substances that contain only one type of atom,
and compounds are mixtures of elements.
B. Elements are two or more atoms chemically bonded together, and
compounds are pure substances that contain only one type of atom.
C. Elements are pure substances that contain only one type of atom,
and compounds are two or more different atoms chemically bonded
together.
D. Elements are mixtures of pure substances, and compounds are
mixtures of different substances.
7. The formula for Sodium Chloride (salt) is NaCl. Sodium Chloride is a(n)
_________________. (6.5C)
A.
B.
C.
D.
A
A
A
A
compound
pure substance
mixture
solution
8. Use the information in the table below to answer the following question.
Element
Hg
I
Li
Compound
H2O
NaCl
C6H12O6
Based on the pattern in the table, is O2 a compound? (6.5C)
A.
B.
C.
D.
Yes, because it contains two atoms.
No, because it is not a pure substance.
Yes, because it is not a pure substance.
No, because it does not contain at least two different atoms.
9. A science student is assigned to write a paper on a common compound. Which
substance could the student choose for this assignment? (6.5C)
A.
B.
C.
D.
Hydrogen
Gold
Water
Helium
10. Sulfur reacts with other elements to form new substances, but sulfur cannot
be broken into simpler substances. Based on this information, how is sulfur
categorized? (6.5A)
A.
B.
C.
D.
Solution
Element
Compound
Mixture
11. Part of the periodic Table is shown below. Read the answer choices carefully.
Which statement most accurately classifies these
substances? (6.5C)
A. Hydrogen and potassium are elements because
their symbols only contain one letter.
B. Lithium, beryllium, sodium, magnesium, and
calcium are elements because their symbols contain
two or more letters.
C. Hydrogen, lithium, beryllium, sodium, magnesium,
potassium, and calcium are all elements, because only
elements are listed on the Periodic Table.
D. Hydrogen, lithium, beryllium, sodium, magnesium,
potassium, and calcium are not elements because
only compounds are listed on the Periodic Table.
12. Of the substances pictured below, which model represents a compound?
(6.3B, 6.5C)
A.
C.
B.
D.
13. Which substance in the chemical reaction is a compound? (6.5C)
Fe + S  FeS
A. Fe
C. FeS
B. S
D. Not here
14. When magnesium (Mg) metal is burned in the presence of Oxygen (O2),
magnesium oxide (MgO) is produced. The properties of magnesium oxide are
different than the individual properties of magnesium and oxygen because
magnesium oxide is ___________________. (6.5C)
A.
B.
C.
D.
A solution
A mixture
A compound
An element
15. Describe the product of the following chemical reaction. (6.5C)
CaCO3
A.
B.
C.
D.
One
One
Two
Two

CaO + CO2
element
compound
elements
compounds
16. Carbon dioxide (CO2) is not found on the Periodic Table because carbon
dioxide is ________________. (6.5C)
A.
B.
C.
D.
An atom
A compound
A gas
A mixture
17. Look at the equation below.
CH4 + 2O2

CO2 + 2 H2O
How many different elements are in the reaction? (6.5C)
Record your answer in the grid on your answer document.
18. The majority of the Earth’s oceans are composed of water (H2O). If the
elements Hydrogen and Oxygen make up most of the Earth’s oceans, then
what are the two elements that make up the salinity of the ocean? (6.5B)
A.
B.
C.
D.
Nitrogen and sulfur
Sodium and chloride
Silicon and aluminum
Fluorine and carbon
19. The chemical equation for hydrochloric acid is H + Cl  HCl. Which correctly
identifies each side of the chemical equation? (6.5C)
A.
B.
C.
D.
elements  compound
compounds  compound
elements  element
compounds  mixture
20. Look at the given compound.
Be3Al2(SiO3)6
How many different elements are in the compound? (6.5C)
Record your answer in the grid on your answer document.