Download Ch. 4 Statement of Evidence Atoms + Notes Outline

Name__________________________________________
Date__________________
Hour_________
Statement and Evidence: Ch. 4 Atoms (Pages 80-95)
BEFORE
AGREE
DISAGREE
STATEMENT AND EVIDENCE
1. If you divide atoms up into the protons, neutrons, and
electrons that make the atom it would still be the same
substance.
EVIDENCE:
PAGE #:
2. Electrons travel in distinct, definite paths around the nucleus of
the atom in the electron cloud.
EVIDENCE:
PAGE #:
3. The nucleus of an atom is very dense.
EVIDENCE:
PAGE #:
4. All atoms of the same element have the same atomic number.
EVIDENCE:
PAGE #:
5. Because the mass of the electron makes half of the weight of
an atom, it must be included in the mass number of the atom.
EVIDENCE:
PAGE #:
AGREE
AFTER
DISAGREE
Ch. 4 Introduction to Atoms
Pages 82-95
Directions: Complete the statement of evidence on the other side.
1. Read each statement, then check agree or disagree with that statement, by checking the box on the left side.
2. Read the chapter and look for evidence to support your answer/or support changing your answer.
3. Write a statement or quote from the book and give the page number which provides the evidence to keep or
change your original answer, then check the agree or disagree to the right.
4. As you read, also look for and complete the items below. All definitions should go in your notebook. Start on a
clean page and be sure to give it the title indicated. The questions can be answered in the spaces provided
below.
In your Notebook-Ch. 4 Atom Definitions
1. atom
2. electrons
5.
6. atomic mass unit (amu)
neutrons
3. electron clouds
4. protons
Ch. 4. Atom Questions
1. Where does the word “atom” come from? What did it mean? (pg. 82)
2. Whose atomic theory was right, Aristotle or Democritus? What did his theory say? (pg. 82)
3. How did Thomson discover electrons? How did he prove that they exist? (pg. 84)
4. How do negative charges of particles within an atom react with positive charges? (pg. 84)
5. How do like charges of particles in an atom react? (pg. 86)
6. How does today’s modern Atomic theory compare to Boh’rs electron levels theory? (pg. 86-87)
7. If you compared an atom to a penny, how small would it be? (pg. 88)
8. Which 2 particles are the most massive of electrons, neutrons and protons? (pg. 89)
9. If an atoms nucleus was the size of a grape, how much would the mass in its nucleus at least have to be? (pg.89)
10. What makes atoms different from each other? (pg 90)
11. What are isotopes? Give an example of one. (pg. 91.
Notebook Cut Out
Directions: Cut the following diagrams out and paste onto a clean page in your notebook. We will fill in the
information together in class.
Type of
Particle
Location
Charge
Atomic
Mass
Unit
Other
Notes
(AMU)
Protons
Neutrons
Electrons
# of protons = # of electrons
# of neutrons = atomic mass – atomic number
Ch. 4 Introduction to Atoms Don’t Copy-This is For you
Pages 82-95
Directions: Complete the statement of evidence on the other side.
1. Read each statement, then check agree or disagree with that statement, by checking the box on the left side.
2. Read the chapter and look for evidence to support your answer/or support changing your answer.
3. Write a statement or quote from the book and give the page number which provides the evidence to keep or
change your original answer, then check the agree or disagree to the right.
4. As you read, also look for and complete the items below. All definitions should go in your notebook. Start on a
clean page and be sure to give it the title indicated. The questions can be answered in the spaces provided
below.
In your Notebook-Ch. 4 Atom Definitions
2. atom
2. electrons
5.
6. atomic mass unit (amu)
neutrons
3. electron clouds
4. protons
Ch. 4. Atom Questions KEY
1. Where does the word “atom” come from? What did it mean? (pg. 82)
“atom” is from Greek word “atomos” means not able to be divided
Atom defined is: the smallest particle in which an element can be divided
2. Whose atomic theory was right, Aristotle or Democritus? What did his theory say? (pg. 82)
Democritus: all substances end up with one particle that could not be divided and still be the same substance
3. How did Thomson discover electrons? How did he prove that they exist? (pg. 84)
Thomson discovered electrons by using a cathode-ray tube with a positive charged plate at the end that
attracted the beam. Since opposite charges attract, he concluded the beam must be negative charged particles
in atoms (electrons), and that all atoms have these particles called electrons.
4. How do negative charges of particles within an atom react with positive charges? (pg. 84)
Opposites attract-so negative particles attract towards positive particles.
5. How do like charges of particles in an atom react? (pg. 86)
Like charged particles repel/push away (negative repel negative) (positive repel positive)
6. How does today’s modern Atomic theory compare to Bohr’s electron levels theory? (pg. 86-87)
Bohr’s model proposed electrons moved around the nucleus in a clear certain path or energy levels.
Modern atomic theory states electrons do not travel in certain paths and the paths can not be predicted.
7. If you compared an atom to a penny, how small would it be? (pg. 88)
A penny contains about 2 x 1022 atoms (20,000 billion billon atoms) or 2 with 22 zeros after it.
8. Which 2 particles are the most massive of electrons, neutrons and protons? (pg. 89)
Protons and neutrons are the most massive. Neutrons are slightly more massive.
9. If the nucleus of an atom was the size of a grape, how much would the mass at least have to be? (pg.89)
Greater than 9 million metric tons
10. What makes atoms different from each other? (pg 90)
The number and arrangement of it’s particles (electrons, neutrons and protons)
11. What are isotopes? Give an example of one. (pg. 91) atoms with the same # protons but different # neutrons (H)
Name__________________________________________
Date__________________
Hour_________
Statement and Evidence: Ch. 4 Atoms (Pages 80-95) ANSWER KEY-Get from Mrs. Brown Rm 1159.
BEFORE
AGREE
DISAGREE
STATEMENT AND EVIDENCE
1. If you divide atoms up into the protons, neutrons, and
electrons that make the atom it would still be the same
substance.
EVIDENCE:
PAGE #:
2. Electrons travel in distinct, definite paths around the nucleus of
the atom in the electron cloud.
EVIDENCE:
PAGE #:
3. The nucleus of an atom is very dense.
EVIDENCE:
PAGE #:
4. All atoms of the same element have the same atomic number.
EVIDENCE:
PAGE #:
5. Because the mass of the electron makes half of the weight of
an atom, it must be included in the mass number of the atom.
EVIDENCE:
PAGE #:
AGREE
AFTER
DISAGREE