Warm-Up: 1. Convert 14 km to meters 2. Convert 455 ml to liters
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Transcript of Warm-Up: 1. Convert 14 km to meters 2. Convert 455 ml to liters
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Warm-Up: 1. Convert 14 km to meters2. Convert 455 ml to liters
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Practice:1. 1285 ml to L2. 19.78 km to m3. 89234 m to km4. .00564 km to m5. 190 cm to m6. 2423.232 mm to m7. 1800 g to kg8. 5343 hg to g9. 4.545 L to ml10. 2 days to seconds
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Notes:Matter
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Matter is anything that has mass and takes up space.
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An atom is the smallest particle into which an element can be divided and still be the same substance.
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If you lined up 70 million atoms, they would stretch across your pencil eraser.
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A piece of paper is 1 million atoms thick.
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An atom’s nucleus is its center.
The nucleus contains protons and neutrons
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The atom is mostly empty space. Think of a baseball inside of Turner Field.
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The number of protons determines the element’s identity
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Warm-Up: 1. What is the “building block of matter?”
2. The number of ______ in the ______gives each element its identity.
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Number of protons
= Atomic Number
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Electrons are negatively charged particles in the electron cloud
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Electrons “orbit” in electron shells
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Energy Level # of electrons1 22 83 184 32
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The number of the period (row) an element is in, is the same as the number of shells it has
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The first shell needs to be full before the second shell gets any electrons.
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The last, or outer, shell is called the VALENCE SHELL.The electrons in the valence shell are called valence electrons
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The number of valence electrons determines reactivity
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Warm-Up:1. How many valence electrons does carbon have?2. How many valence electrons does sodium have?3. How many valence electrons does chlorine have?
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Isotopes have different numbers of neutrons in the nucleus
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Atomic Mass: Average Mass of all isotopes in nature of that element
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Mass Number: Number of protons and neutrons in the atom
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A covalent bond happens when atoms share electrons
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Warm-Up:1. How many electrons can fill the first shell of an atom? How many can fill shells 2 & 3?2. What is the valence shell?3. Draw a oxygen atom
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Molecules are made of multiple atoms chemically joined together.
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Covalent bonds usually happen between nonmetals
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An ionic bond happens when atoms gain or lose electrons
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An ionic bond happens when atoms gain or lose electrons
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When atoms join to form molecules, they create a new substance with unique properties
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The new substance is a compound
Sugar: C12H22O11
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Ammonia: NH4
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Warm-Up: 1. When atoms chemically bond together, they create a ______.
2. Atomic Number = # of ______ in the nucleus of an atom.
3. Draw a nitrogen atom (with shells)
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Warm-Up: 1. __________ is made of particles that have volume and mass.
2. Draw an oxygen atom.
3. How many valence electrons does oxygen have?