6 Foundations of Chemistry
Date
3 Understanding the Atom
Name____________________
Lesson 6-1 Classifying Matter
34 points this page
Period
242 points total
Directions: Write the correct term in the boxes to the right of each clue. Then
unscramble the letters in the shaded boxes to spell a tenth term. (10 points)
Directions: Answer each question or respond to each .
Write a complete sentence using the subject and predicate. (4 points each sentence)
o
atom
o
mixture
1. What particles make up atoms?
o
substance
o
o
compound
homogeneous mixture
o
o
dissolve
matter
o
heterogeneous mixture
o
unique
o
element
1. has mass and takes up space
2. Describe the electrical charges of each of the three particles in
2. unlike anything else
atoms.
3. oxygen or hydrogen, for
example
3. What are the two main classifications of matter?
4. Its composition is always the
same.
5. Substances are evenly mixed
in this
4. What is the difference between atoms and molecules?
6. building block of matter
7. Substances are not evenly
5. How are atoms related to elements?
mixed in this.
8. water or carbon dioxide, for
example
6. How are elements related to compounds?
Page 1
9. to form a solution by mixing
evenly
10. When unscrambled, the letters in the shaded boxes spell
_____________, which is matter that can vary in composition.
Utah Core Curriculum Standard I Objective 1 Describe the structure of matter in terms of atoms and molecules.
Davis School District Grade 7 iScience Buffalo Book Chapters 3 and 7
Online Physical iScience Chapter 9
Name____________________
Date
Lesson 6-2 Physical Properties (30 points)
Period
Directions: Use the diagram to answer each question or respond to each statement.
Directions: Read each statement below. If the statement is correct, write correct.
If the statement is not correct, write not correct. Then use proofreading marks to
make the statement correct.
______________1.
______________2.
Mass is the weight of an object.
______________3.
The density of an object can be calculated
by dividing the object’s length by its
width.
______________4.
A physical property is a characteristic of
matter that you cannot observe or measure
without changing the identity of the
matter.
______________5.
Atoms that make up a compound are
bonded together; they cannot be separated
by physical means.
Figure A
Figure C
Figure B
15.
Which state of matter is represented by the particles in Figure A?
16.
Which state of matter is represented by the particles in Figure B?
17.
Which state of matter is represented by the particles in Figure C?
18.
Give an example of water in each state of matter.
Every element and compound has a
unique set of properties.
Directions: Fill in the blank with the term that correctly completes each sentence.
6. A ______________is a characteristic of matter that you can
observe or measure without changing the identity of the matter.
Directions: On each line, write the preposition from the list that correctly completes
each sentence. Some prepositions may be used more than once.
above
at
below
in
of
on
7. Water vapor is an example of a ______________
19. Boiling point is a physical property ________ a substance.
8. Mass is the amount of ______________in an object.
20. Mass is the amount of matter ________ an object.
21. Water in the ocean is a liquid, but the water vapor in the air
9. Mass is a _________________________property
because its value depends on the size of a sample.
______________is the pull of gravity on matter.
11. Volume is the amount of _____________something takes up.
12. ______________is the mass per unit volume of a substance.
13. Density, melting points and boiling points are ____________
_____________ properties of matter because it does not
10.
depend on the amount of material.
14. Electrical conductivity is the ability of matter to __________an
electric current.
Page 2
________ the ocean is a gas.
22. The mass of an object is the same _____ the Moon as it is on
Earth.
23. The conservation ________ mass occurs in physical and
chemical changes.
24. Sulfur is located directly ________ oxygen in the periodic table.
25. Hydrogen is found ________the top of the left most column of
the periodic table.
26. Chemical symbols are written _____ each box on the periodic
table.
Utah Core Curriculum Standard I Objective 1 Describe the structure of matter in terms of atoms and molecules.
Davis School District Grade 7 iScience Buffalo Book Chapters 3 and 7
Online Physical iScience Chapter 9
Name____________________
Use Ratios
Date
28 points this page
A ratio is a comparison of two numbers or measurements. One way to
write a ratio is as a fraction. To calculate the density of a substance, you
write a ratio of mass to volume as a fraction, and then simplify the fraction
so that the value in the denominator is 1.
What is the density of a substance if a 32-g sample has a volume of 4 cm3?
Step 1 Use the information in the problem to write a ratio of mass to
volume.
Period
Objective 2
Accurately measure the characteristics of matter in different states.
a. Use appropriate instruments to determine mass and volume of solids and liquids
and record data.
b. Use observations to predict the relative density of various solids and liquids.
c. Calculate the density of various solids and liquids.
Describe the relationship between mass and volume as it relates to density.
3. A diamond is made of pure carbon (C). A 1.6-cm3 sample of diamond
has a mass of 5.6 g. What is the density of carbon?
32 g
4 cm3
Step 2 Simplify the fraction by dividing the numerator by the
denominator.
4. A 10.0 cm3 sample of copper has a mass of 89.6 g. What is the
density of copper?
32 g
8g
=
3
4 cm
1 cm3
Step 3 Write the answer.
The density is 8 g/cm3.
5. A sample of lead (Pb) has a volume of 5 cm3 and a mass of 56.5 g.
What is the density of lead?
Practice
(4 points each)
(2 points math problem 1 point unit labeled 1 point answer)
1. A sample of aluminum (Al) has a mass of 16.2 g and a volume of 6
cm3. What is the density of aluminum?
6. Helium gas (He) is less dense than air, which is why a helium-filled
balloon rises in the air. A 1-g sample of He has a volume of 5,000
cm3. What is the density of helium?
2. A 9-cm3 sample of mercury (Hg) has a mass of 121.5 g. What is the
density of mercury?
Page 3
7. What is the density of CO (Carbon Monoxide) gas if 0.196 g occupies
a volume of 100 ml?
Utah Core Curriculum Standard I Objective 1 Describe the structure of matter in terms of atoms and molecules.
Davis School District Grade 7 iScience Buffalo Book Chapters 3 and 7
Online Physical iScience Chapter 9
Name____________________
Date
Period
Lesson 3.1 Discovering Parts of an Atom
Matching
Directions: On the line before each statement, write correct if the statement is correct
or not correct if the statement is not correct. If the statement is not correct, change the
underlined word(s) to make it correct.
(35 points this side)
Directions: On the line before each definition, write the letter of the term that matches
it correctly. Not all terms are used.
Write the terms NOT USED and a definition.
_______
_______
_______
_______
_______
_______
_______
_______
_______
1. Early Greek philosophers, such as Democritus,
thought that all matter was made of fire, water, air,
and earth.
2. John Dalton’s atomic theory supported some of
the ideas of Aristotle.
3. An atom is the smallest piece of an element that
still represents the element.
4. Atoms are so small that about 7.5 million carbon
atoms could fit into the period at the end of this
sentence.
5. An electron is a particle with one negative
charge.
6. Rutherford’s atomic theory stated that most of an
atom’s mass is concentrated in the nucleus.
7. Niels Bohr discovered the existence of neutrons,
or neutral particles, in the nucleus of an atom.
8. According to the modern atomic model, electrons
form an electron cloud around the nucleus.
9. Modern scientists believe that protons and
neutrons are not made of smaller particles.
1. particle with one negative charge
2. smallest particle of an element
that still represents that element
3. particle with one positive
charge
4. neutral particle found in the
nucleus
A.
B.
C.
D.
E.
F.
nucleus
electron
neutron
proton
quark
atom
5.
6.
Directions: Label this diagram by writing the correct term from the word bank on each
line.
electron cloud
neutron
nucleus
proton
Directions: Answer each question. (4 points each sentence)
10. Is it possible to see atoms with your eyes? Explain.
11. What is an STM?
12.How have STMs helped scientists study atoms?
Page 4
Utah Core Curriculum Standard I Objective 1 Describe the structure of matter in terms of atoms and molecules.
Davis School District Grade 7 iScience Buffalo Book Chapters 3 and 7
Online Physical iScience Chapter 9
(30 points this side)
Name____________________
Atomic Theory Magic Square
Put the number of the definition from the list below on the line in
the square with the appropriate term. Check your answers by adding
the numbers in each row and column.
They should add up to the same number.
Democritus _____
Dalton _____
Thomson _____
element _____
Rutherford _____
proton _____
atom _____
Bohr _____
quark _____
neutron _____
nucleus _____
alpha particle _____
electron _____
Chadwick _____
energy levels _____
electron cloud _____
1. current explanation of where electrons might be found in the
atom
2. English schoolteacher who proposed the atomic theory model
of matter
3. proposed the plum-pudding model of the atom; discovered the
electron
4. the negative particle that circles the nucleus
5. developed the model of the atom in which electrons orbit the
nucleus in energy levels
6. the neutral particle in the nucleus of an atom
7. the tiny positive core of an atom; contains protons and neutrons
8. discovered the nucleus using his gold foil experiment
9. small particles that make up protons and neutrons
10. the smallest particle of an element that has the properties of
that element
11. the positive particle in the nucleus of an atom
12. used by Rutherford in his experiment; made of two protons and
two neutrons
13. Greek philosopher who made a mental model of the atom
14. the paths in which electrons circle the nucleus according to the
Bohr model
15. discovered the neutron
16. building blocks of matter represented by a symbol
Page 5
Date
Period
Directions: Complete the crossword puzzle with the correct terms from the word bank.
atoms electron
electron cloud
neutron
nucleus proton
Down
2. area around the nucleus where an
electron is most likely to be
4. neutral particle that exists in the
nucleus of an atom
6. smallest pieces of elements that still
represent those elements
Across
1. particle with one negative charge (1–)
3. small area in the center of an atom
that contains most of the atom’s mass
5. particle with one positive charge (1+)
Utah Core Curriculum Standard I Objective 1 Describe the structure of matter in terms of atoms and molecules.
Davis School District Grade 7 iScience Buffalo Book Chapters 3 and 7
Online Physical iScience Chapter 9
Name____________________
Atomic Structure
(60 points this page)
1. The atomic number represents the number of _______________.
2. In a neutral atom the number of protons is always equal to the number
of _______________.
3. The mass number of an atom is the sum of the number of
______________ and the number of ______________.
Use a copy of the periodic table in your planner and the information given in the
data table to fill in the blanks. (1 point each blank square)
Substance
Symbol
Atomic
Number
Mass
Number
Number
of
Protons
2 4
Mg 12
Zinc
30 65
Bromine
80
Al
13
Uranium
Sodium
11
Kr
Calcium
40 20
Ag
47
Gold
79 197
Copper
64
Number
of
Neutrons
Number
of
Electrons
Helium
Page 6
12
35
14
146 92
12
48 36
61
29
Date
Period
Names and Symbols: Using the Main Ideas



The names of the elements and the symbols that represent the
elements may be found on the periodic table.
Symbols may contain one, two or three letters.
The first letter of each symbol is always capitalized; the
second and third letters are always lowercase.
The following sentences contain the names of many elements.
Underline the name of the elements as you read. Then use proofreading
marks to insert the chemical symbols in place of the names of the elements.
1. First we wrapped some sandwiches in aluminum foil, and then
put some food in tin cans into our knapsacks.
____________________________________________________
2. We looked at jewelry made of gold, copper, and silver.
____________________________________________________
3. The balloons were filled with helium.
____________________________________________________
4. The mercury in the thermometer was up to the 30 degree mark.
____________________________________________________
5. The neon sign over the movie theater advertised an adventure
story about prospectors looking for uranium.
____________________________________________________
6. Lithium is sometimes used as a medicine.
____________________________________________________
7. The vitamin supplements contain calcium, iron, and potassium.
____________________________________________________
8. The town water supply was treated with chlorine and fluorine.
____________________________________________________
9. The solar cell contained a thin layer of silicon.
____________________________________________________
10. When the glowing splint was placed in the bottle containing
hydrogen, we heard a loud “pop.”
____________________________________________________
Utah Core Curriculum Standard I Objective 1 Describe the structure of matter in terms of atoms and molecules.
Davis School District Grade 7 iScience Buffalo Book Chapters 3 and 7
Online Physical iScience Chapter 9
Name_________________________
25 points this page
Chapter 3 Understanding the Atom
Directions: On the line before each statement, write correct if the statement is
correct or not correct if the statement is not correct. If the statement is not correct,
change the underlined word(s) to make it correct.
_______
_______
_______
1. A proton has a charge of 1-.
Directions: Place the events in chronological order from earliest to most recent
by writing a number 1 through 7 on the line before the statement that describes
each event.
_____
_____
_____
_____
_____
Page 7
Period
Directions: On each line, write the term that correctly replaces the underlined
words in each sentence.
1. Carbon-12, carbon-13, and carbon-14 are examples of atoms of the
same element that have different numbers of neutrons. _______
2. Neutrons and protons have the same relative mass.
3. The number of electrons in an atom of an element
is the element’s atomic number.
_______ 4. Neutral atoms have the same number of protons
and electrons.
_______ 5. Carbon-12 and carbon-13 are isotopes, so they have
different numbers of neutrons.
_______ 6. The mass number of an atom can be determined by
adding the number of electrons and the number of
neutrons.
Key Concept How has the atomic model changed over time?
_____
_____
Date
J.J. Thomson investigates the electrical charges of atoms.
Democritus challenges the popular idea that matter is made
of fire, water, air, and earth.
Niels Bohr investigates the energy level of electrons.
Students of Ernest Rutherford conduct the gold foil
experiment.
John Dalton finds evidence to support the theory that all
matter is made of atoms that cannot be divided, created, or
destroyed.
Scientists discover that protons and neutrons are made of
quarks.
James Chadwick discovers that in addition to protons, the
nucleus also contains neutrons.
2. Radioactive elements emit radiation without external force or cause.
_______
3. Nitrogen’s number of protons is seven. _______
4. A radioactive element goes through a process in which its unstable
atomic nucleus changes into another more stable nucleus by emitting
radiation. _______
5. Beneath each element’s symbol on the periodic table, there is a
number that provides the average mass of the element’s isotopes,
weighted according to the abundance of each isotope for the element.
_______
6. Na+ and F– are examples of atoms that are no longer neutral because
they have gained or lost electrons. _______
7. Uranium is an example of an element that is able to spontaneously
emit radiation. _______
8. Carbon-12 is the most abundant isotope of the element; it has a sum
of protons and neutrons equal to 12. _______
Utah Core Curriculum Objective 2 Accurately measure the characteristics of matter in different states.
Davis County Buffalo Book Chapter 6 Physical iScience Bubble Book Chapter 7
Name_________________________
Date
Period
Directions: On each line, write the term that correctly completes each sentence.
Review and Reinforcement
1. What is the base unit for measuring mass? ______________
2. A balance is used to measure _____________________.
3. What instrument is used to measure liquid volume?
Before each of the measurements described below write the name of
the tool that you would use to obtain that m measurement.
____________________________
metric ruler
graduated cylinder
triple-beam balance
Celsius thermometer
4. What is the formula for finding the volume of a regular solid
block?
Volume = __________ x ___________ x _________
5. One millimeter (mL) of a liquid volume is equal to
____________of a solid volume.
6. What is the Density of water? _________________.
______________________ 1. The mass of a small stone
______________________ 2. The length of your finger
______________________ 3. The temperature of a glass of lemonade
______________________ 4. The mass of a cube of sugar
9.
______________________ 5. The volume of a small box of juice
______________________ 6. The air temperature
______________________ 7. The mass of a handful of powder
10. Which liquid is less dense?
______________________ 8. The volume of a diamond
11. Which liquid is most dense?
______________________ 9. Your height
______________________ 10. The mass of a coin
______________________ 11. The volume of a small rock
______________________ 12. The volume of a bottle of shampoo
12.
13.
______________________ 13. The width of a pine cone
14.
______________________ 14. The volume of a milk carton
Page 8
Utah Core Curriculum Objective 2 Accurately measure the characteristics of matter in different states.
Davis County Buffalo Book Chapter 6 Physical iScience Bubble Book Chapter 7