September 2nd 2015 page 25 DO: I will be able to create ......high speeds, like the Earth orbits the...
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September 2 nd 2015 page 25 • DO: I will be able to create various elements using a Bohr model. • EQ: How are valence electrons important in bonding? What are the maximum number of electrons in the first three energy levels? Why are atoms neutral? Where is most of the mass of an atom found?
Transcript of September 2nd 2015 page 25 DO: I will be able to create ......high speeds, like the Earth orbits the...
September 2nd 2015 page 25•DO: I will be able to create various elements using a Bohr model.
•EQ:
How are valence electrons important in bonding?What are the maximum number of electrons in the first three energy levels?
Why are atoms neutral?
Where is most of the mass of an atom found?
Daily Check1. If the reactants contain 12 carbon atoms and 4 oxygen atoms, what must be true of the products?
The product must be a molecule made of 16 atoms
The products must contain 4 carbon atoms and 12 oxygen atoms.
The products must consist of carbon to oxygen atoms in a 1:1 ratio.
The products must contain 12 carbon atoms and 4 oxygen atoms.
• Explanation:
2. The number placed below and to the right of anelement’s symbol in a chemical formula is called a
a. Coefficient
b. Product
c. Reactant
d. Subscript
• Explanation:
Atomic mass+electrons
Protonsneutrons
Because electrons(-) = protons (+)there is no charge in ATOM as a whole unit.
Neutron
-
NO
ElectronProtons
+
+++
++
Nucleus
Nature of Matter: The Atom
The Element Square
PRACTICE
September 3rd 2015 page 27•DO: I will be able to create various elements using a Bohr model.
•EQ:
How are valence electrons important in bonding?What are the maximum number of electrons in the first three energy levels?
Why are atoms neutral?
Where is most of the mass of an atom found?
Warm Up Questions1. Sodium is an element found in table salt. It contains 11 protons and 12 neutrons. How many electrons are found in a neutral atom of sodium?a. 11b. 12c. 23d.12. What does the law of conservation of matter state?a. The total mass of the reactants is greater than the total mass of the products.b. The total mass of the reactants is less than the total mass of the products.c. The total mass of the reactants equals the total mass of the productsd. Matter can not change form.
PRACTICE
Nature of Matter: The Atom
• There are three parts to an atom. They are protons, neutrons, and electrons. These are called subatomic particles.
• The number of positive protons equals the number of negatively charged electrons in an atom
• Atoms are neutrally balanced
• Atoms are one of the smallest units of matter.
• An atom is more that a million times smaller than the thickness of a human hair.
Nature of Matter: The Atom
• Shows how electrons move from the highest energy level of one atom to the highest energy level of another atom during bonding
• Shows the contents of the nucleus of an atom
Bohr Model-A representation of the atom
Nature of Matter: The Atom
• The nucleus holds two types of particles in it: neutrons andprotons.
• Since the neutron has no electric charge, and the proton has a +1 charge, the nucleus has an overall +1 charge.
•Most of the mass of an atom is located here in the nucleus.
The center of the atom is called the
Nucleus
• A neutron has no electrical charge associated with it, we say it has a charge of 0.
A neutron is found in the nucleus only.
• A proton always has an electrical charge of +1 amu.
• A proton is found in the nucleus only
• The nucleus of an atom gets its overall charge from the proton.
• Electrons are very small particles located outside the nucleus. They orbit (circle around) the nucleus at high speeds, like the Earth orbits the sun.
• An electron has an electrical charge of –1.
• Electrons orbit on rings or energy levels. The outside ring is called the “valence shell”
• The valence shell is where one atom bonds together with another atom.
Energy Shells
September 4th 2015 page 29•DO: I will be able to demonstrate the difference between atoms, molecules, and compounds as well as create the atomic structure of elements by reading an element square.
•EQ:
How are valence electrons important in bonding?What are the maximum number of electrons in the first three energy levels?
Why are atoms neutral?
Where is most of the mass of an atom found?
Writing Prompt page28Writing Prompt: In your own words explain how Elements, atoms, molecules and compounds relate to one another. Use a unique example to relate the connections between Elements, atoms, molecules and compounds to another idea, like our ice cream example, to illustrate how they work together.
An AtomBohr Model
The Element Square
ATOM ELEMENT MOLECULE COMPOUND
September 7th 2015 page 31•DO: I will be able to demonstrate the difference between atoms, molecules, and compounds as well as create the atomic structure of elements by reading an element square.
•EQ:
How are valence electrons important in bonding?What are the maximum number of electrons in the first three energy levels?
Why are atoms neutral?
Where is most of the mass of an atom found?
1. Explain: a chemical property vs. a chemical reactionExplanation: ______________________________________________________________________________________________________________________________________
2. In an atom, the number of protons equals the number of
a. Nucleib. Electronsc. Neutronsd. Isotopes
Warm Up Questions
September 8th 2015 page 33•DO: I will be able to explain the importance of the atom and subatomic particles through an investigation of scientific discovery.
•EQ:
•Draw and label the subatomic parts of an atom?
•How are molecules created?
•Explain this statement: All compounds are molecules, but not all molecules are compounds.
Warm Up Questions
1. The chemical formula for glucose is C6H12O6. How many different elements make up one molecule of glucose?
a. 1b. 3c. 12 d. 24Explanation: _________________________________________ ____________________________________________________________________________________________________________
2. Which of the following is the basis for arranging the elements in the modern periodic table?a. Atomic Name b. Atomic Number c. Atomic Mass d. Atomic SymbolExplanation: _________________________________________ ____________________________________________________________________________________________________________
EXPLAIN:
September 9th 2015 page 35•DO: I will be able to explain the arrangement of and differentiate between the groups of the periodic table and explain the differences.
•EQ:
•What are the different ways that the periodic table is arranged?
•What information are you aware of just by where an element is located on the periodic table?
1. How many elements are listed in the modern periodic table?a. 50b. 75c. 100 +d. 1,000 +
2. Solve the equation:CH4 + O2 2CO2 + H2O16g ? 44g 36g
a. 16b. 36c. 44d. 64
Warm Up Questions
