Download Chemistry Exam – Matter and Change, Atomic Structure, and

Chemistry Exam – Matter and Change, Atomic Structure, and Laboratory Procedure Directions: Please read and answer each question as directed. All answers should be written on the answer sheet. Do not write on this exam. Section 1 – Multiple Choice 1) Which particle has a negative charge and a mass that is approximately 1/1840 times the mass of a proton? a. an electron b. a neutron c. an alpha particle d. a positron 2) What is the charge of an atom? a. Positive charge b. No charge c. Negative charge d. Slightly positive and slightly negative 3) Which subatomic particle is electrically neutral? a. positron b. proton c. electron d. neutron 4) Which quantity identifies an atom? a.
b.
c.
d.
atomic number mass number total number of neutrons total number of valence electrons 5) What is the composition of the nucleus of an atom? a. protons and neutrons b. protons and electrons c. neutrons and electrons d. protons only 6) How many protons are in the nucleus of an atom of beryllium (Be)? a. 4 b. 5 c. 2 d. 9 Test Booklet B Chemistry Exam – Matter and Change, Atomic Structure, and Laboratory Procedure 7) All atoms in an element have the same number of a. nucleons and electrons b. protons and electrons c. nucleons and neutrons d. protons and neutrons 8) A substance that is composed only of atoms having the same atomic number is classified as a. an element b. a compound c. a homogeneous mixture d. a heterogeneous mixture 9) Compared to an atom of C, an atom of C has a. fewer neutrons b. fewer protons c. more protons d. more neutrons 10) Which atom contains the greatest number of neutrons? a. 40Ar b. 37Cl c. 39K d. 41Ca 11) If an atom is represented as ?, the atom is a. Na b. Al c. Mg d. Br 12) Which atom contains exactly 15 protons? a. (O) Oxygen-­‐15 b. (P) Phosphorus – 32 c. (S) Sulfur – 32 d. (N) Nitrogen – 15 13) What is the total number of electrons present in an atom of Co? a. 32 b. 86 c. 27 d. 59 14) The mass number of an atom is equal to the number of a. protons plus neutrons b. neutrons only c. protons only d. electrons plus neutrons Test Booklet B Chemistry Exam – Matter and Change, Atomic Structure, and Laboratory Procedure 15) The atoms C and N are similar in that they both have the same a. nuclear charge b. mass number c. atomic number d. number of neutrons 16) Isotopes of the same element must have the same number of protons and a. the same number of neutrons b. the same number of nucleons c. a different number of electrons d. a different number of neutrons 17) Atoms of 16O, 17O, and 18O have the same number of a. neutrons, but a different number of protons b. protons, but a different number of electrons c. protons, but a different number of neutrons d. electrons, but a different number of protons 18) Which of these properties could not be used to distinguish between table salt and sugar? a.
b.
c.
d.
Boiling point
Melting point
Density
Color
19) A property that depends on the amount of matter, not the type of matter, is a(n):
a.
b.
c.
d.
extensive property
intensive property
physical property
chemical property
20) Which of the following is not an example of an intensive property?
a.
b.
c.
d.
density
boiling point
color
mass
Test Booklet B Chemistry Exam – Matter and Change, Atomic Structure, and Laboratory Procedure 21) Which set of properties does CO2 (gas) have? a.
b.
c.
d.
Definite shape and definite volume No definite shape and no definite volume Definite shape but no definite volume No definite shape but definite volume 22) A liquid differs from a gas because liquids a.
b.
c.
d.
will take the shape of its container have stronger forces of attraction are in constant motion have no regular arrangement 23) During a physical change, a.
b.
c.
d.
the composition of matter changes a color change occurs the composition of matter does not change a precipitate forms 24) Which of the following is an example of a chemical change?
a.
b.
c.
d.
Grinding a rock
Burning wood
Cutting grass Water freezing 25) Which of the following is not an example of a homogenous mixture? a.
b.
c.
d.
lemonade
oil and vinegar
trail mix
kool aid
26) Which of the following is an element?
a.
b.
c.
d.
Carbon dioxide (CO2)
Mercury (Hg)
Water (H2O)
Glucose (C6H12O6)
27) A compound is
a.
b.
c.
d.
Two substances not chemically combined.
A substance that cannot be separated even by a chemical reaction.
Two substances that can be joined together by physical means.
A substance made up of two or more elements joined by a chemical reaction.
Test Booklet B Chemistry Exam – Matter and Change, Atomic Structure, and Laboratory Procedure 28) The law of conservation of mass states that the mass of the products of a chemical
reaction
a. are greater than the mass of the reactants
b. are less than the mass of the reactants c. are equal to the mass of the reactants d. are not calculable 29) 30) The phase change represented by the equation H20 (liquid) ----> H2O (gas) is called
a. sublimation
b. condensation
c. melting
d. boiling
31) Which diagram represents a graduated cylinder?
32) What kinds of injuries should be reported to you teacher? a) bleeding wounds b) headaches c) bumps and bruises d) all injuries/illness Test Booklet B Chemistry Exam – Matter and Change, Atomic Structure, and Laboratory Procedure 33) What might happen if your lab group has a cluttered lab area? a) Accidently knock over glassware b) lose paperwork c) transport chemicals out of the lab d) all of the above 34) Suppose you are going to begin a scientific investigation. What should be the first thing everyone in your group does? a) Read the directions b) make an observation c) mix chemicals d) talk with group 35) How do we dispose of chemicals in lab? a) dump down the drain b) throw in trash c) follow teacher’s instructions d) leave on table for teacher to dispose of Section 2 – Matching Word Bank: Element Chemical change Protons Intensive Properties Homogeneous mixtures Atom Empty space Atomic mass Periodic table Electron 1. Rutherford concluded that most of the alpha particles pass through the gold foil because the atom is mostly ____________________. 2. Elements are different because they contain different numbers of _____________. 3. To calculate the _________________________ of an element, multiply the mass of each isotope by its natural abundance, expressed as a decimal, and then add the products. 4. The three kinds of subatomic particles are protons, neutrons, and ____________. 5. An _______________________ is the smallest particle of an element that retains its identity in a chemical reaction. 6. Every sample of a given substance has identical ________________________ because every sample has the same composition. 7. Based on the distribution of their components, mixtures can be classified as heterogeneous mixtures or _________________________. 8. An _____________________ is the simplest form of matter that has a unique set of properties. Test Booklet B Chemistry Exam – Matter and Change, Atomic Structure, and Laboratory Procedure 9. The _______________________ allows you to easily compare the properties of one element to another element. 10. Possible clues to a ___________________________ include a transfer of energy, a change in color, the production of a gas, or the formation of a precipitate. Section 3 – Short Answer 1. Complete the missing information below. Be sure to round to the nearest whole number. Show your work for potential partial credit. Name Gold Symbol Au Protons 79 Neutrons 118 Arsenic As 33 Osmium Os 114 Electrons 33 2. Dan spilled the contents of a beaker on the floor. He didn’t tell the teacher because he didn’t want to get into trouble. Is this proper laboratory procedure? Provide two reasons justifying your answer. Please use complete sentences. 3. Subatomic particles, atoms, elements, and compounds are all interconnected and related to one another. Using complete sentences, explain the relationship between these four chemistry concepts. 4. This is a chemical equation: 6 CO2 + 6 H2O à C6H12O6 + 6 O2 . The arrow represents a chemical reaction. On which side of the arrow are the reactants of the reaction and on which side are the products of the reaction? Describe the impact a chemical reaction has on the composition of matter. 5. Calculate the atomic mass of copper. Show your work for potential partial credit. Copper-­‐63 69.2% 62.93amu Copper-­‐65 30.8% 64.93amu Bonus Question: What resource can you use to check if your answer to problem 5 is correct (even during this test). Explain how you would use this resource to know you calculated correctly. Test Booklet B