Name:____________________________________________________ Date:_______________ Period:_______
Unit 1b Test
Write the and circle the correct choice.
____1. Which symbolizes a molecule of a compound?
a. He
b. Be
c. Ne
d. NaCl
____2. Elements on the periodic table are arranged based on which of the following?
a. similar properties
b. number of protons
c. number of bonds
d. number of energy levels
____3. Each element in the periodic table is assigned an atomic number. This number is the same as
a. the number of electrons in the atom's nucleus.
b. the number of protons in the atom's nucleus.
c. the number of neutrons in the atom's nucleus.
d. the number of protons and neutrons in the atom's nucleus.
____4. Why does the law of conservation of mass dictate that chemical equations be balanced?
a. because atoms are never gained or lost in a chemical reaction
b. because elements are classified by weight
c. because chemical formulas are written from left to right
d. because using the wrong chemical symbol causes confusion
Use the diagram below to answer question 5.
____5. Using the Law of Conservation of Matter, determine the number of grams of iron sulfide (FeS) that will be
produced in this reaction.
a. 24 grams
b. 32 grams
c. 56 grams
d. 88 grams
____6. The smallest particle into which an element can be divided and still be the same substance is called a(n)
a. nucleus.
c. atom.
b. electron.
d. neutron.
Name:____________________________________________________ Date:_______________ Period:_______
7. What negative particle did J. J. Thomson discover?
a. neutron
c. atom
b. electron
d. proton
8. Where are electrons likely to be found?
a. the nucleus
b. electron clouds
c. mixed throughout an atom
d. paths, or energy levels
9. What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in common?
a. They each identified new elements.
b. They each identified new isotopes of atoms.
c. They each contributed to the development of the atomic theory.
d. They each conducted experiments in which particles collided.
10. An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of
a. 39.
c. 197.
b. 158.
d. 276.
11. Which statement about isotopes is true?
a. They have the same number of protons.
b. They have the same number of neutrons.
c. They have a different atomic number.
d. They have the same mass.
12. Each vertical column on the periodic table is called a(an)
a. period.
c. element.
b. group.
d. property.
13. The elements to the right of the zigzag line on the period table are called
a. nonmetals.
c. metalloids.
b. metals.
d. conductors.
Mendeleev arranged the elements by
a. density.
b. melting point.
c. appearance.
d. increasing atomic mass.
15. What are most of the elements in the periodic table?
a. metals
c. precious metals
b. metalloids
d. nonmetal
16. Which of the following is an example of a chemical reaction?
a. ice melting in a glass of water
b. paper turning soft when wet
c. salt crystals forming as sea water evaporates
d. leaves changing colors in the fall
17. How many carbon atoms are in this glucose molecule? C6H12O6
a. three
c. twelve
b. six
d. twenty-four
Name:____________________________________________________ Date:_______________ Period:_______
18. Which of the following is NOT a sign of a chemical reaction?
a. gas formation
c. energy change
b. solid formation
d. state change
19. What is the force that holds atoms together called?
a. a chemical solution
c. a chemical reaction
b. a chemical mixture
d. a chemical bond
20. Which is the product in this chemical formula? N + O2
a. N
c. O2
b. O
d. NO2
21. Which of the following states the law of conservation of mass?
a. Atoms are rearranged in a chemical reaction, and some join new molecules.
b. Two compounds combine to form a new compound with different properties.
c. Mass cannot be created or destroyed in a chemical reaction.
d. Energy is neither created nor destroyed in a chemical reaction.
_____ 23. How do substances form during a chemical reaction?
a. One or more substances are combined.
b. Chemical bonds in molecules add atoms to make more molecules.
c. A solid substance is formed in a solution.
d. Chemical bonds break, atoms rearrange, and new chemical bonds
Name:____________________________________________________ Date:_______________ Period:_______
Use the terms from the following list to complete the sentences below.
Atomic Mass
Atomic Number
A positively charged particle in the nucleus of an atom is called a(n) ____________________.
The periodic table is arranged by _____________________________.
The _______________________________ is found to the left of the zig-zag line.
27. A neutral particle in the nucleus of an atom is called a(n) ___________________.
Match each item with the correct statement.
a. synthesis reaction
c. single-displacement reaction
b. decomposition reaction
d. double-displacement reaction
____ 28.
two or more substances combine to form one new compound
one compound breaks down to form two or more substances
ions from two compounds exchange places
one element replaces another element in a compound
Short Answer - Answer in Complete Sentences!
32. Draw the Bohr model for the following element.
Name:____________________________________________________ Date:_______________ Period:_______
If the chemical properties of a substance have not changed, has a chemical reaction occurred? Explain.
34. Name the 5 ways you know that a chemical reaction has occurred.
35. What type of reaction does the following equation represent?
Does it follow the Law of Conservation of Mass? Explain.
FeS + 2HCl → FeCl2 + H2
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