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Unformatted text preview: 12-13 pages on Microsoft word. These notes cover Bio, Chem and Physics.NOTE: I HAVE DIAGRAMS IN MY NOTES AND THEY DIDNT APPEAR. ANYTHING THAT REFERS TO A DIAGRAM IN THESE NOTES IS USELESS. JUST DISREGARD AND KEEP READINGSNC 2D Science Exam Review NotesChemistry• Periodic Table Metals found at left side and non-metals found on the right side (Hydrogen is an exception!) o Chemical Families:1. Alkali Metals:• Group 1/far left column• Shiny, silver metals that usually form compounds that are white solids • Very soluble and reactive in water2. Alkaline Earth Metals• Group 2 ; in pure form they react with water• Shiny, silver metals that form compounds that are insoluble in H2O3. Noble Gases• Far right column• Valence shell of electrons is full, therefore they don’t form compounds4. Halogens• Found left of Noble Gases ; Halogens are poisonous elements• React well with Alkali Metals to form compounds this reaction usually takes the poison awayLewis Dot Structure Bohr-Rutherford Diagram• An atom is the way an element is found when in its pure form, while an ion is the state an element is found when it has either gained or lost electrons to have a full valence shell• Ionic Compound: A compound consisting of positive and negative ions • Covalent Bond: A bond formed by 2 or more non-metal atoms sharing 1 or more pairs of electrons Covalent Bond Ionic Compound/Molecular Bond• Atoms bond so they can have a full valence shell; they want to be perfect like the noble gases• Law of Conservation of Mass: The total mass of the reactants in a chemical reaction is always equal to the total mass of the products. Atoms are just rearranged and transferred during a chemical reaction ** Know what letters on the periodic table mean (Na=Sodium; N=Nitrogen; Mg=Magnesium) **• Write the formula: Calcium(has 2 valence) Nitride(has 3 valence) = Ca3N2• Balancing Chemical Equations:This balanced chemical equation shows that there needs to be the same amount of atoms of each element on each side of the equation• By looking at the reactants in a chemical equation, you can predict the products by determining what type of chemical reaction is taking place. There are 5 chemical reactions; they are as follows:o Chemical Reactions1. Synthesis Reaction (Building)• Reactants are elements/small compounds• Product is one large compound • E.g. 2Na + Cl2 → 2NaCl2 2. Decomposition Reaction (Destruction)• Reactant is one large compound• Products are elements/ small compounds• E.g. 2NaCl → 2Na + Cl23. Single Displacement Reaction• Reactants are 1 element & 1 compound...
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- Fall '09
- Chemical reaction, trophic level