Transcript Dihydrogen Monoxide!!!!!!!! - Coach Stevens's Rock Hill H

Dihydrogen Monoxide!!!!!!!!
Why???
?
Chemistry Joke!
If H20 is water, what
is H204?
Drinking, bathing,
washing,
swimming…
All kinds of things!
What’s in a name???
How many people can you “bond” with!? 
You must turn in to me a piece of paper with…
1.Your element and it’s oxidation number
2.A total of 6 IONIC COMPOUND formulas
3.AND
those compounds
My Ionthe name
Whatof
I am
Chemical
Name
Fe+2
bonding with
Formula
O-2
FeO
Iron Oxide
Try these covalent molecules…





CO
CO2
N5H8
TeBr2
Si3S7
Carbon monoxide
Carbon dioxide
Pentanitrogen octahydride
Tellurium dibromide
Trisilicon heptasulfide
FLASHBACK
1. How many oxygen atoms are there in bleach,
NaClO, AKA sodium hypochlorite?
2. Acetone (CH3COCH3), or nail polish remover,
has how many total hydrogen atoms?
3. How do you determine oxidation #’s?
4. What is the oxidation # of Al, O, & Cl ?
5. Write ionic formulas: (find charges 1st then criss-cross!!)
Mg + F
Be + N
6. Name the following compounds:
N5H8
SrCl2
• COVALENT:
–NO
–NO2
–N2O
• IONIC:
–NaF
–ZnCl
1. Electron Dot Diagram:
Diagrams:
Hydrogen: H
2. Pictorial
H
O
Oxygen:
Water: H2O
H
O
H
Covalent
bonds!
Chemical
Changes
and
Chemical
Reactions
Occur when the size or shape of the substance is
changed
Occasionally, the color can change, too
Regardless, the original substance(s) do not change
Evidences of Physical Changes:
- Bending, stretching, heat, and cooling can all cause
a physical change
***All phase changes are physical changes
Occurs when there is a change in the
arrangement of atoms so that a
different substance with different
properties is produced
Very often,
there is some
kind of
evidence
(for example,
the formation
1. Formation of a gas
2. Reaction with acids
(like this picture of
copper reacting with
nitric acid)
3. (Sometimes) a color
change can indicate a
chemical change.
- A good example of this
is metal tarnishing
Is a neutralization reaction
a chemical change?
1. Bubbles/fizzing/formation
of a gas
2. Precipitate formed
3. Energy change
4. Color change
5. Odor…
Chemistry Joke!
If you're not part of the
solution…
You're part of the
precipitate!
FLASHBACK
1. What is the main difference between a
chemical and physical change?
2. If a reaction forms a gas, you know it is a
______________ change.
3. If something changes color, you know it’s a
chemical change.
True
False
4. Name the four evidences of a chemical rxn.
5. Explain a situation in which bubbling occurs,
but it is NOT a chemical change.
Why do you burp after drinking a Coke?
Excuse me…
• Coke and other soft drinks are carbonated
• Carbonation occurs when carbon dioxide is dissolved
in water or solution
• This gives the "fizz" to carbonated beverages
• Excess gas needs out of the stomach.. So we burp!
Using the materials provided:
1. 2 pieces of Alka-Seltzer
2. 1 film canister
3. Water
…you are to
build a projectile!
Pick ONE question to answer and generate a
hypothesis and WRITE IT DOWN…
Use an “If-Then” statement!
1. How does changing the volume of water
effect the time/height of rocket “launch”?
2. How does changing the amount of AlkaSeltzer effect the time/height of rocket
Lab Report
You are to write a brief lab report on your experience…
- Skip lines between headings
- Full sentences!
Alka seltzer
Title
Hypothesis: (your question)
Data: Table? List?
Conclusion: tell me what you learned (in paragraph form!)
1. What evidence did you see of a chemical reaction
taking place? How does this relate to the lab?
2. Refer back to your hypothesis… was it right or
wrong??
Why??
3. What would have done differently… or how would
FLASHBACK
EOC WORKBOOK
Pg. 41 (all)
A. An exothermic reaction __________________ heat.
B. An endothermic reaction __________________
heat.
C. ( A + B  AB ) is an example of a _____________
reaction
Naming:
2)P2O5 ___________________________
3)Mg3N ___________________________
5)SiO2 ____________________________
6)BaCl2 _______________________________
8)B2P9 _____________________________________
Formulas:
14) aluminum nitride ____________________
16) disulfur pentaphosphide ____________________
17) potassium sulfide
__________________________
Chemical Reactions
and Equations:
What do they mean?
What do they show?
During any chemical reaction, there is an
energy change.
1. Exothermic reaction: heat is released during
the reaction, gets hot!
2. Endothermic reaction: heat is
absorbed during the reaction,
Everyday Exothermic and Endothermic
Reactions
• Instant
Cold
Packs
• Instant
heat
packs
•AIRBAGS!
The airbag's inflation system reacts
sodium azide (NaN3) with potassium
nitrate (KNO3) to produce nitrogen gas.
Hot blasts of the nitrogen inflate the
airbag.
Videos
• Exothermic vs. Endothermic
• Endothermic Reaction
A. Reactants: original substances entering a
chemical rxn
- what you started with, on the left side
B. Products: resulting substances
- what you end with, on the right side
Reactants  Products
Endothermic vs. Exothermic
Calcium Chloride vs. Sodium
Bicarbonate…
who will win the temperature war???
Turn into me:
Half sheet of paper
1. Synthesis: 2 substances combine to form 1
substance
A + B -> AB
2. Decomposition: 1 substance breaks down
(decomposes) to 2 substances
AB -> A + B
(opposite of
synthesis)
3. Single Displacement: 1 element replaces
another
A + BC -> AC + B
4. Double Displacement: positive ion of one
Synthesis
1. 4Al + 3O2 --> 2Al2O3
Decomposition
2. Ca(OH)2 --> CaO + H2O
3. Zn + CuSO4 --> ZnSO4 + Cu
Single Displacement
Single Displacement
4. Cl2 + 2KBr --> 2KCl + Br2
5. BaCl2 + Na2SO4 --> 2NaCl + BaSO4
Synthesis
Double
Displacement
FLASHBACK
Label the following equations: (4types)
1. Zn + HCl  ZnCl2 + H2 Single Displacement
2. Fe + O2  Fe2O3
Synthesis
3. SiO2 + HF  SiF4 + H2ODouble Displacement
4. FeS + HCl  H2S + FeCl2Double Displacement
5. In lab yesterday, what gas produced the
signature “popping” sound?
You will be conducting reactions to produce 5 different common gases
and observe their chemical and physical properties.
CO2
A. NaHCO3 + HCl  NaCl + H20 + ______
NO2
B. Cu + 4HNO3  Cu(NO3)2 + 2H20 + 2 _____
NH3
C. NH4Cl + NaOH  NaCl + H20 + ______
O2
D. 2H2O2  2H2O + ____
H2
E. Mg + 2HCl  MgCl2 + ____
FLASHBACK
Section Review
Pg. 645 #1, 3
EOC REVIEW
Pg. 656 #1-5, 11, 15
FLASHBACK
EOC WORKBOOK
Pg. 43 [all]
• Chemical reaction - is the process of
changing reactants to products by a
chemical change
• Chemical reactions are symbolized by
–Reactants Products
(s) solid; (l) liquid; (g) gas; (aq) aqueous
are the physical states of the reactants and
products
 The reactants which enter into a reaction.
 The products which are formed by the
reaction.
 The amounts of each substance used and each
substance produced.
___Mg
2
(s) + __ O2(g)

__ MgO(s)
2
 We use subscripts to balance compounds
 CaCl2
 subscripts cannot be changed
 We use coefficients to balance equations
 2 NaCl + _ Ca(OH)2  2 NaOH + __ CaCl2
• Goal: to get the same number of
atoms on both sides of the equation
__ Al + __ O2  ___ Al2O3
__ NaCl  __ Na + __ Cl2
__ Li + __ H2O  __ LiOH + __ H2
A. A balanced chemical equation
represents the process of a chemical
reaction in which atoms are rearranged
but not created or destroyed.
B. By balancing chemical equations, you
show that mass is conserved…
Law of Conservation of Mass!
Mass is neither created nor
destroyed in an ordinary chemical
or physical reaction
Mass of Reactants
=
Mass of Products
LAB:
Looking at the…
Law of Conservation
of mass!!!
FLASHBACK
Balance the following equations:
1. ___Zn + ___HCl  ___ZnCl2 + ___H2
2. ___Fe + ___O2  ___Fe2O3
3. ___SiO2 + ___HF  ___SiF4 + ___H2O
4. ___FeS + ___HCl  ___H2S + ___FeCl2
5.What is the overall goal of balancing
equations?
FLASHBACK
Balance the following equations:
1. __S8 + __O2

__SO2
2. __ HgO  __Hg + __ O2
3. __BeCl2 + __KOH  __Be(OH)2 +__KCl
4. __S8 + __ O2  __ SO3
5. __H3PO4 + __Mg(OH)2 __Mg3(PO4)2 + __H2O
Reaction Rates!
Reactions occur when
particles of reactants
collide with energy
1. Temperature: higher temperature,
reaction rate increases
1. Particles moving faster, more
collision between particles
2. Concentration: when reactants are
more concentrated, rate of reaction
increases
1. More particles mean more collisions
3. Surface Area: more surface
area, reaction rate increases
4. Catalyst: presence of catalyst
speeds up reaction without
being permanently changed
[Inhibitor: slows down a reaction]
EOC WORKBOOK
Pg. 45 [# 2-6]
Pg. 46 [# 1-6]
Salt: Up close and personal
Make some observations of salt under
a microscope!!
• http://www.sciencenetlinks.com/lessons.php?Bench
markID=4&DocID=173
• http://www.sciencenetlinks.com/lessons.php?Bench
markID=4&DocID=173
• http://www.mos.org/sln/sem/sem.html