n h 2 o na k
DESCRIPTION
Warm up 9/23 & Lab Turn in* Identify the following symbols & identify whether they are Elements (E) or Compounds (C). N H 2 O Na K. H 2 SO 4 HCl Cl NaCl. Write the equation: H 2 O+ H + H 3 O + What are the products and what are the reactants? - PowerPoint PPT PresentationTRANSCRIPT
Warm up 9/23 & Lab Turn in*Identify the following symbols & identify
whether they are Elements (E) or Compounds (C).
N H2O Na K
H2SO4
HCl Cl NaCl
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Write the equation: H2O+ H+ H3O + What are the products and what are the reactants?
*Staple pages 3-6 + 2 sheets of graph paper and put in basket in the front of the classroom.
Chemistry cont.Chemical Reactions
(rxn)EX. NaOH + HCl NaCl + H2O
reactants: left side
products: right side
Exergonic/exothermic: release energy like heat, explosion, light etc. – feels warm
endergonic/endothermic: requires energy to occur and takes it from the environment- feel cold
Activation Energyenergy needed to start a rxn
NEED TO MEMORIZE THE FOLLOWING ELEMENTS AND
COMPOUNDS FOR YOUR QUIZ AND TEST!
ELEMENTS
H: hydrogen
O: oxygen
N: nitrogen
C: carbon
Na: sodium
Cl: chlorine
K: potassium
S: sulfur
COMPOUNDSH2O: waterNaCl: sodium chloride/saltH2SO4: sulfuric acidHCl: hydrochloric acidNaOH: sodium hydroxideCO2: carbon dioxideO2: oxygen gas
ACIDS, BASES, AND pH
pp. 39-44
WaterPolar (covalent) compound
Water has a positive (+) and negative (-) “pole”
(+) is due to H and (-) is O
• acts like a magnet with + attracted to –
• pulls apart molecules like NaCl (ionic bond)
WaterBonding
covalent bonds hold H2O together
hydrogen bonds hold molecules of H2O
Covalent > Hydrogen
Acids and Bases
H2O = water
H+ = hydrogen ion
OH- = hydroxide ion
Acids and Bases H2O H+ + OH-
H+ reacts with H2O
H2O + H+ H3O+ (hydronium)
H3O+ more commonly written as H+
Warm up 9-25
Define the following terms
H2SO4
CO2
K
S
H3O+
Describe 2 properties of water’s bonding.
Name 3 properties of an acid?
Acids
Acids: H+ > OH-
pH less than 7
Acid Properties: tastes sour, highly corrosive
EX. HCl, H2SO4
Bases
Bases: OH- > H+
pH more than 7
Base Properties: tastes bitter, feel slimy, caustic
EX. NaOH, Mg(OH)2
pH power of Hydronium
measures acidity (from 0-14) and how much H3O+/H+ is present. The closer to 0, the more the H3O +/H+
0 up to 7 = acid
7 = neutral
over 7 = base/alkaline
Can use indicators to tell the pH ( phenol red, pH paper, litmus, BTB)
InterventionThursday:10/3 @ 2:40 pm
Friday: 10/4 @ 6:50 am
This year biology is offering intervention to insure success for all students.
Before each exam students will have the opportunity to attend a targeted study review session. To be credited with intervention students must attend one 45
min intervention session and complete all corresponding work.
Students will have two opportunities to complete intervention.
Intervention will be offered once before school and once after school the week of the exams. Specific Dates will be posted on teacher website.
Completion of intervention will earn students a 5% test score increase to a maximum of 75% on the test.
At any time during the semester if student’s class average falls below 70% he or she is expected to attend intervention until grade improves.
RAFT Project
Role, Audience, Format, Topic
Due Friday Oct. 4th at the beginning of class. Worth a lot of points