EOC Review Test
1. Which of the following describes a particle that contains 36 electrons, 49 neutrons, and 38 protons?
A. an ion with a charge of 2B. an ion with a charge of 2+
C. an atom with a mass of 38 amu
D. an atom with a mass of 49 amu
2. Which of the following comparisons correctly describes subatomic particles?
A. An electron has a negative charge and a mass larger than the mass of a proton
B. A neutron has a negative charge and a mass smaller than the mass of a proton.
C. A neutron has a neutral charge and a mass larger than the mass of an electron.
D, A proton has a positive charge and a mass smaller than the mass of an electron.
3. The nucleus of a nitrogen atom consists of which of the following particles?
A. electrons only
B. protons only
D. electrons and neutrons
E. electrons and protons
F. Protons, electrons and neutrons
4. How do the atoms of Carbon-12 and Carbon-14 differ?
A.
B.
C.
D.
atomic number
number of electrons
number of protons
number of neutrons
5. A glass of ice water is.piaced on a table. After 10 minutes, there are drops of water on the outside surface of
the glass. Which change in phase caused the drops of water?
A. Liquid water in the air evaporated into a gas.
B. Liquid water in the air condensed into a solid.
C. Watervapor from the air evaporated into a liquid.
D. Water vapor from the air condensed into a liquid.
6. Study the table. Which atom has a net positive charge?
A.
W
B. X
C. Y
D. Z
7. When water changes from solid to tiquid to gas, which statement is true?
A. The mass (amount) stays the same,
B. The temperature goes down.
C. The temperature stays the same.
D. The mass (amount) is greater.
8. The periodic Table of the Elements is shown below.
Cesium (Cs), the circled element, is a highly reactive metal. Which elements have a reactivity similar to cesium?
A. Barium (Ba) and Radon (Rn)
B. Silver (Ag) and Cadmium (Cd)
C. Sodium (Na) and Potassium (K)
D. Strontium (Sr) and Radium (Ra)
9. When sodium metal reacts with chlorine gas, Sodium chloride (table salt) forms. The data table below shows
information about sodium, chlorine, and Sodium chloride. Which statement best describes the properties of
sodium, chlorine, and sodium chloride?
A. All have similar chemical and physical properties.
B. B. All have different chemicat and physical properties.
C. All have similar physical properties but different chemical properties.
D. All have similar chemical properties but different physical properties.
SODIUM,
10. Use the information below to answer the following question(s).
Silver nitrate (AgN03) a colorless powder, consists of the metallic element silver (Ag) and two non-metallic elements,
nitrogen and oxygen (N and O). Silver nitrate mixed with water (1-120) forms a clear solution. When a piece of copper
wire (Cu) is put into a silver nitrate solution, the clear solution turns blue. A silvery white substance forms on the wire
and falls to the bottom of the solution.
Which statement best explains why silver nitrate (AgN03) is classified as a compound?
A. Silver nitrate contains a metal.
B. Silver nitrate chemically reacts with copper.
C. Silver nitrate forms when three elements chemically combine.
D. Silver nitrate forms a solution when mixed with water.
Il. Alex placed a small beaker of cold water on a hot plate and heated it for 10 minutes. He took the temperature of
the water several times during those 10 minutes and recorded his data. Alex claims that the graph below shows the
relationship between temperature and time when water is heated.
Which statement best explains why the temperature leveled off in section 2 of the graph?
A. Alex turned off the hot plate so the water did not get any warmer.
B. The water reached the boiling point, so the temperature no longer increased.
C. An experimental error caused the graph to level off, because the water temperature should keep
increasing over time.
D. Cold water heats faster than warm water, so once the cold water was room temperature, it took
more than 10 minutes to make it hot.
12. A scientist uses an instrument to observe the pattern of molecules in a substance. The picture below shows what
the scientist sees. What state of matter is the scientist most likely observing?
A.
Solid
B. Liquid
C. Gas
13. Which of the following graphs shows how the rate of evaporation changes with changes in water temperature?
14. A pond is pictured below in two different seasons. Which of the following has caused the changes in the pond
from A to B?
A.
B.
C.
D.
The pond water has lost heat energy.
The pond water temperature has increased.
Warm water has risen to the top of the pond.
Ali of the water has evaporated from the pond.
15. Generally, how do atomic masses vary throughout the periodic table of the elements?
A.
They increase from left to right and top to bottom.
B.
They increase from left to right and bottom to top.
C.
They increase from right to left and
to bottom.
D.
They increase from right to left and bottom to top.
16. The atomic number of iron is 26, and the atomic mass is 55.847. What do these numbers mean in regard to
protons, electrons and neutrons?
A. There are 26 each of protons and neutrons, and the rest of the mass is the result of electrons.
B. There are 26 protons and 26 electrons. Some atoms of iron have 29 neutrons; the .847 shows that
there is more than one isotope of iron.
C.
There are 26 protons and 29 neutrons. Each particle has an atomic mass of 1
D. There are 26 protons and 26 neutrons. Since neutrons have slightly more mass than protons, the mass
is greater than 52.
17. The Periodic Table of the Elements classifies all of the known elements into categories based on their physical
and chemical properties. Repeating pattern within the table are useful in predicting how elements combine to
form every kind of matter.
In order to be identified as the element carbon (C), an atom must have
A.
B.
C.
D.
6 protons
6 neutrons
12 electrons
6 electrons
18. Below are four ball-and-stick models representing compounds. Which of these models best represents ammonia
(NH3)?
D
19. The reaction of CaO and water is exothermic. A student mixes the two chemicals in a test tube and touches the
side of the test tube. Which statement describes the student's observation?
A. The test tube becomes hot as heat is released.
B. The test tube becomes hot as heat is absorbed.
C. The test tube becomes cold as heat is released.
D. The test tube becomes cold as heat is absorbed.
20. The graph represents the amount of energy in the reactants and products of a chemical reaction.
If total energy is conserved, which statement explains why the energy of the reactants does not equal the
energy of the products?
A. The reaction is exothermic.
B. The reaction is endothermic.
C. The reaction requires a catalyst.
D. The reaction has a low activation energy.
21. The law of conservation of mass can be demonstrated by a chemical reaction. Which of the following
models of a chemical reaction best represents the law of conservation of mass?
B.
c.
D.
22.Elements X and Y react to form compound XY.
How is compound XY different from elements X and Y?
A.
The mass of compound XY is greater than the combined masses of elements X and Y.
B.
The volume of compound XY is less than the combined volumes of elements X and Y C.
C.
The physical properties of compound XY have changed from those of elements X and Y.
D.
The reaction of compound XY is greater than the reactivity of elements X and Y.