STAR Testing ReviewChemical Reactions&Chemistry of Life
Chemical & Physical ChangePhysical Changes: Any change thatalters the form, shape, or appearanceof a substance but does n...
Chemical & Physical ChangeChemical Changes: a change that asubstance undergoes where a totallynew substance is the result...
Did a chemical reaction occur??Was light given off? It was chemical.Was gas released? It was chemical.Was heat given of...
Chem vs. Phys PropetiesChemical Properties- Thecharacteristic of a substance thatdescribes its ability to change into ane...
Bonding & Chemical ReactionsIn order for a chemical reaction tohave taken place, bonds must havebeen broken and re-create...
ReactionsRemember, when atoms cometogether to form compounds, the newcompounds produced have differentproperties than the...
Balancing equationsDue to the conservation of matter,equations MUST be balanced! Atoms cannot be created or destroyed! ...
Let’s try one…N2 + O2 ---> N2O52 N 2 N2 O 5 OWe need to balance out the Oxygen first, then theNitrogen. This gives us…2N2 ...
Let’s do another, for fun!!Fe + HCl ---> FeCl2 +H21 Fe 1 Fe1 H 2 H1 Cl 2 ClFe + 2HCl ---> FeCl2 +H2
One More…C2H4 + O2 ---> CO2 + H2O2 C 1 C4 H 2 H2 O 3 OC2H4 + 3O2 ---> 2CO2 + 2H2O
Acids, Basesand the pH scale
Acids and BasesAn Acid is a chemical compound, that,when dissolved in water has a pH ofless than 7.Acids taste sour, rea...
Acids and BasesBases are chemical compounds that,when dissolved in water, have a pH ofabove 7.Bases taste bitter, feel s...
Uses for Acids:Acids are naturally in many of the foodswe eat :Tomatoes, lemons, oranges,and even leafy green veggies!Ac...
Uses for BasesCement is made using basesMany cleaning solutions used in thehome are bases (drain cleaner, glasscleaner, ...
The pH scale!!!!The pH scale is a range of values from0-14 that express the concentration ofhydrogen ions in a solution....
Acids & Bases: pH scaleAcids range from 0-6Acids have the most amount ofhydrogen ions.Bases range from 8-14Bases have ...
Neutralizing Acids & BasesThe reaction between acids and basesis a called neutralization.The neutralization of acids and...
Chemistry of Life!A quick (very quick) introduction!
Carbon! It’s special!Because of it’s very special ability tocombine in any ways with itself andother elements it has a ce...
CHONPS!Living organisms are made ofmolecules consisting largely of:CarbonHydrogenOxygenNitrogenPhosphorusSulfur
Reactions&life chem (STAR review)
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Reactions&life chem (STAR review)

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Reactions&life chem (STAR review)

  1. 1. STAR Testing ReviewChemical Reactions&Chemistry of Life
  2. 2. Chemical & Physical ChangePhysical Changes: Any change thatalters the form, shape, or appearanceof a substance but does not change itinto a new substance. EXAMPLE: If I were to toss fresh berriesinto a blender and make a fruit smoothie-it would still be fruit, just mashed intosmaller pieces.
  3. 3. Chemical & Physical ChangeChemical Changes: a change that asubstance undergoes where a totallynew substance is the result. EXAMPLE: In the magnesium lab, weburned magnesium and after it’s chemicalchange the result was magnesium oxide.It was no longer metal!!
  4. 4. Did a chemical reaction occur??Was light given off? It was chemical.Was gas released? It was chemical.Was heat given off? It was chemical.Was energy released? It waschemical.
  5. 5. Chem vs. Phys PropetiesChemical Properties- Thecharacteristic of a substance thatdescribes its ability to change into anew substance Example: Burning of Magnesium intoMgOPhysical Properties- A characteristic ofa substance that can be observedwithout changing the substance into anew substance Example: Ice Melting, Cutting a piece ofpaper
  6. 6. Bonding & Chemical ReactionsIn order for a chemical reaction tohave taken place, bonds must havebeen broken and re-created!! Atomsrearrange to create something totallynew. Bonds can change from one form toanother; covalently bonded atoms canrearrange to create ionic bonded atoms(like with the Mg lab)
  7. 7. ReactionsRemember, when atoms cometogether to form compounds, the newcompounds produced have differentproperties than the atoms did before. No exploding salt!!!!
  8. 8. Balancing equationsDue to the conservation of matter,equations MUST be balanced! Atoms cannot be created or destroyed! Thus, the atoms in the products mustequal the total atoms in the reactantsREMEMBER: The atoms are only beingrearranged!
  9. 9. Let’s try one…N2 + O2 ---> N2O52 N 2 N2 O 5 OWe need to balance out the Oxygen first, then theNitrogen. This gives us…2N2 + 5O2 ---> 2N2O54 N 4 N10 O 10 O
  10. 10. Let’s do another, for fun!!Fe + HCl ---> FeCl2 +H21 Fe 1 Fe1 H 2 H1 Cl 2 ClFe + 2HCl ---> FeCl2 +H2
  11. 11. One More…C2H4 + O2 ---> CO2 + H2O2 C 1 C4 H 2 H2 O 3 OC2H4 + 3O2 ---> 2CO2 + 2H2O
  12. 12. Acids, Basesand the pH scale
  13. 13. Acids and BasesAn Acid is a chemical compound, that,when dissolved in water has a pH ofless than 7.Acids taste sour, react with metals andcarbonates and will turn blue litmuspaper red.Acids are corrosive- they eat away atother materials.
  14. 14. Acids and BasesBases are chemical compounds that,when dissolved in water, have a pH ofabove 7.Bases taste bitter, feel slippery andturn red litmus paper blue.Bases are corrosive- they eat awaymaterials.
  15. 15. Uses for Acids:Acids are naturally in many of the foodswe eat :Tomatoes, lemons, oranges,and even leafy green veggies!Acids are also used in many fertilizers.Acids can also be found in batteries
  16. 16. Uses for BasesCement is made using basesMany cleaning solutions used in thehome are bases (drain cleaner, glasscleaner, bleach, soap)Bases can also be found in bakedgoods such as breads, cakes, andcookies!
  17. 17. The pH scale!!!!The pH scale is a range of values from0-14 that express the concentration ofhydrogen ions in a solution. The more hydrogen ions, the lower thenumber on the pH scale.
  18. 18. Acids & Bases: pH scaleAcids range from 0-6Acids have the most amount ofhydrogen ions.Bases range from 8-14Bases have the least amount ofhydrogen ions.7 on the scale is neutral (neither)
  19. 19. Neutralizing Acids & BasesThe reaction between acids and basesis a called neutralization.The neutralization of acids and basesdepends on the identities, volumesand concentrations of the reactants. Salts will typically form as a result ofacids and bases neutralizing.
  20. 20. Chemistry of Life!A quick (very quick) introduction!
  21. 21. Carbon! It’s special!Because of it’s very special ability tocombine in any ways with itself andother elements it has a central roll inthe chemistry of living organisms!
  22. 22. CHONPS!Living organisms are made ofmolecules consisting largely of:CarbonHydrogenOxygenNitrogenPhosphorusSulfur

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