To get: Chrome Book - Open myMCPS classroom Intro to Chemistry Notes To Turn In: Observing Living Organisms Lab (if not turned in on Friday Homework: Create (at least) 5 flashcards from the chemistry terms

Warm Ups 3 minutes to get a STAMP Monday Question: What is matter? 3 minutes to get a STAMP Must write the question AND your answer 3 points each: 1pt - question 1pt - stamp 1pt - correct answer 15 points per week Absent? Copy from a neighbor

CHEMISTRY!?!!

Chemical Terms- Pg 5 Matter- anything that occupies ____ and has _____ The “stuff” of the universe All chemicals are matter just like all matter is basically chemical Space Mass

What makes up Matter? Atoms! Atom- The smallest possible ____ of an element that still has the properties of that element. Made of 3 particles: unit Location Charge Proton Neutron Electron Nucleus +1 None Nucleus Electron Cloud -1

**The proton and neutron together form the (atomic) nucleus. **The electrons move quickly outside of the nucleus in the electron cloud

Chemical Terms Element- a pure substance made of the same types of atoms that cannot be broken down into other substances by chemical means. Compound- a substance containing two or more elements that are chemically combined A great example is WATER Water is made of 2 Hydrogen atoms and 1 Oxygen atom (H2O)

Every element has a symbol containing 1 or 2 letters Ex: Carbon = _________ Sodium= ________ Hydrogen= _________ Chlorine= _______ Oxygen = ________ Calcium= ________ Nitrogen= _________ Phosphorus= ________ Use the chart to fill in the symbols for each element.

Atomic Number: The # of in the nucleus— different for each element. protons

In a neutral uncharged atom, the # of protons = # of electrons What is the charge on an atom with: 8 protons and 10 electrons? -2

What is the charge on an atom with 4 protons and 2 electrons? +2 Build an Atom practice on chromebooks- Google Classroom

Summarizer/Exit Card on myMCPS Period 3- Take Exit Card immediately Summarizer/Exit Card on myMCPS Open myMCPS Classroom Go to Biology Class Click on Quizzes Complete:Intro to Chemistry Day 1 Exit Card Do NOT eat the M&Ms on your desk. They are Dirty. You will earn clean M&M’s to eat at the end of class

To pick up: Edible Atom Activity Chromebook (just to go to weebly)…can use your phone To get out: Blue Warm up Sheet Notes from yesterday Homework: 8 flashcards- Properties of water From Weebly (You can paraphrase definitions) Do NOT eat the M&Ms on your desk. They are Dirty. You will earn clean M&M’s to eat at the end of class

Tuesday Warm Up Question: 1) Proton charge? 2) Neutron charge? 3) Electron charge? Get out Blue Warm Up sheet

Electrons are arranged in energy levels (also called Orbitals or Electron Shells) Electrons in the outermost shell are called ____________ electrons. The number of Valence Electrons, determines how many ________ an element can form. Atoms are most reactive when the outer shell is partially full (Atoms "want" to have a full outer shell!) Valence Bonds

Energy Level Number of Electrons # of Electrons each energy level can hold: Energy Level Number of Electrons 1st 2nd 3rd 2 8 8

Drawing a Bohr Model Oxygen: Atomic #8 Find your element on the periodic table Determine how many electrons your element has (hint: this is the same as the atomic number) Fill in the energy levels from the inside out, keeping in mind how many electrons each energy level holds. Total # electrons: # Valence e-= + Vacanices= 8 6 2

Draw a Bohr model of Magnesium Atomic # 12 Total # of electrons: # Valence e-= + Vacanices= 12 2 6

Chemical Bonding Atoms interact such that they all try to have 8 electrons in outermost orbit (energy level) The attractive forces between atoms in a compound are chemical bonds 11

Chemical Bonding Vocab: Molecule: A particle with 2 or more atoms bonded together Compound: Molecule with at least 2 different elements. They can have very different properties from the elements that make them up.

An example:  Chlorine is a greenish gas while sodium is a soft, shiny metal.  When the two are combined, white sodium chloride (table salt) is made NaCl

Chemical Bonding Covalent Bonds - Two atoms share one or more pairs of electrons Each ends up with 8 electrons in its outermost energy level (at least part of the time) 11

Draw a Covalent Bond Hydrogen Hydrogen + H H

Chemical Bonding Ionic Bonds - One atom loses electrons; the other gains electrons Ions: any atom/molecule with Charge (positive or negative) 11

Chemical Bonding Atom that loses electrons has a net positive charge Atom that gains electrons has a net negative charge Unlike charges attract An ionic bond is then formed from the attraction between the positive charge and negative charge 11

Sodium Chloride (NaCl) Draw an Ionic Bond: Sodium Chloride (NaCl) Sodium (atomic number 11) Chlorine (atomic number 17)

Bohr Modeling with M&Ms Group 1 and 5: Ne, N, O, Mg Group 2 and 6: Be, F, S, Mg Group 3 and 7: Li, N, Ar, P Group 4 and 8: Cl, B, Na, O