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Elements, Periodic Table, and Compounds Quiz
1. The reactants involved in a chemical reaction are shown. How many O atoms must be
present in the product that forms from this reaction?
Na2O + H2O
?
A. 1
C. 3
B. 2
D. 4
2. If the reactants contain 12 carbon atoms and 4 oxygen atoms, what must be true of the
products?
A.
B.
C.
D.
The product must be a molecule made of 16 atoms.
The products must contain 4 carbon atoms and 12 oxygen atoms.
The products must consist of carbon to oxygen atoms in a 1:1 ratio.
The products must contain 12 carbon atoms and 4 oxygen atoms.
3. Which symbolizes a compound?
A. He
B. Be
C. N2
D. NaCl
4. What must be true about the mass of the reactants and the mass of the products in a
chemical equation?
A.
B.
C.
D.
The total mass of the reactants must equal the total mass of the products.
The total mass of the reactants is greater than the total mass of the products.
The total mass of the reactants is less than the total mass of the products.
The total mass of the reactants is unrelated to the total mass of the products.
5. On the periodic table, nitrogen is represented by N (atomic number 7). N is a chemical
A. equation
B. period
C. symbol
D. group (family)
6. Each element in the periodic table is assigned an atomic number. This number is the same as
A.
B.
C.
D.
the number of electrons in the atom's nucleus.
the number of protons in the atom's nucleus.
the number of neutrons in the atom's nucleus.
the number of protons and neutrons in the atom's nucleus.
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7. Sodium is an element found in table salt. It contains 11 protons and 12 neutrons. How many
electrons are found in a neutral atom of sodium?
A. 11
B. 12
C. 23
D. 1
8. What do elements in the same group have in common?
C. masses of their atoms
A. similar chemical properties
D. size of their atoms
B. number of protons
9. Which element in the table is listed first on the periodic table?
Element
Atomic Number
Oxygen
8
Carbon
6
Gold
79
Calcium
40
A. oxygen
B. carbon
C. gold
D. calcium
10. A group of identical atoms would be classified as
A. a solution.
B. a compound.
C. an element.
D. a mixture.
11. Potassium is an alkali metal that is used in the making of fertilizers. The element block for
potassium is pictured below. What is the atomic number of potassium?
A. 19
B. 20
C. 39.098
D. 58
12. Using the same element block in number 11, what is the atomic mass of potassium?
A. 19
B. 20
C. 39.098
D.58
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13. The number of protons and the number of neutrons added together in an atom tells you
the
A. mass number
B. atomic number
C. number of isotopes
D. number of molecules
14. What subatomic particles make up the nucleus?
A. protons and neutrons
B. protons and electrons
C. neutrons and electrons
D. only protons
15. The subatomic particle with a negative charge is
A. the proton
B. the electron
C. the neutron
D. the nucleus
16. As you go down the periodic table, the period number increases. What does this mean
about the number of electron energy levels?
A. They increase
B. They decrease
C. They remain the same
D. Nothing happens
17. The picture below shows an ion. How many electrons are in this element?
A. 5
B. 4
C. 3
D. 2
18. In the picture below, what is the atomic number?
A. 13
B. 36
C. 14
D. 49
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19. In the picture below, what is the number of neutrons?
A. 10
B. 20
C. 30
D. 15
20. What type of charge does a neutron have?
A. Positive
B. Negative
C. No charge
D. Double positive
21. In an isotope, what is the subatomic particle that changes?
A. Proton
B. Neutron
C. Electron
D. Nucleus
22. In an Ion, what is the subatomic particle that changes?
A. Proton
B. Neutron
C. Electron
D. Nucleus
23. What will this chemical equation look like after it is balanced?
P4 + ____ O2  ____ P2O3
A.
B.
C.
D.
2 P4 + 3 O2  2 P2O3
1 P4 + 3 O2  3 P2O3
3 P4 + 3 O2  2 P2O3
1 P4 + 3 O2  2 P2O3
24. What will this chemical equation look like after it is balanced?
____ CF4 + ____ Br2  ____ CBr4 + ____ F2
A.
B.
C.
D.
2 CF4 + 2 Br2  1 CBr4 + 2 F2
1 CF4 + 2 Br2  1 CBr4 + 2 F2
1 CF4 + 3 Br2  1 CBr4 + 2 F2
1 CF4 + 2 Br2  1 CBr4 + 3 F2
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25. What will this chemical equation look like after it is balanced?
____ Al + ____ HCl  ____ H2 + ____ AlCl3
A.
B.
C.
D.
2 Al + 6 HCl  3 H2 + 2 AlCl3
3 Al + 6 HCl  3 H2 + 2 AlCl3
2 Al + 6 HCl  4 H2 + 2 AlCl3
2 Al + 6 HCl  3 H2 + 6 AlCl3
26. Gallium has 31 protons and a mass number of 69. How many neutrons does Gallium have?
A. 31
B. 39
C. 38
D. 100
27. Beryllium has 4 protons and a mass number of 9. How many neutrons does Beryllium have?
A. 4
B. 6
C. 5
D. 13
28. Which of the following is a molecule?
A. NOH
B. H2
C. O3
D. All of the above
29. Which of the following is a compound?
A. NH3
B. H2
C. Be
D. Li4
30. True (A) or False (B): All compounds are molecules
31. True (A) or False (B): All molecules are compounds
32. True (A) or False (B): Elements are made of atoms
33. True (A) or False (B): Molecules are the smallest unit of a compound
34. True (A) or False (B): Atoms can be broken down
35. True (A) or False (B): Chemical equations do not have to be balanced
36. True (A) or False (B): The first part of a chemical equation is called the product
37. True (A) or False (B): A compound is two different elements combined
38. True (A) or False (B): A molecule is one or more elements put together, whether they are
the same or different
39. True (A) or False (B): Elements are man made
40. True (A) or False (B): The periodic table is arranged by increasing atomic number