Catalyst – March 32+7, 2010
Write the skeleton equations for:
1. Scandium and nitrogen gas combine to make scandium (II) nitride. (TRANSITION METAL ALERT!)
2. Hydrogen gas and oxygen gas react to produce water. (DIATOMIC ALERT!)
3. Calcium hydroxide and sodium nitrate react to form calcium nitrate and sodium hydroxide. (POLYATOMIC ALERT!)
Today’s Agenda
CatalystChemistry Prom 2010 Day 1!
Practice and Work TimeGEE Prep Time…What?Exit Question
Today’s Objectives
SWBAT differentiate between synthesis and decomposition reactions.
SWBAT predict the products of synthesis and decomposition reactions.
Front Door
Projector2nd Period
Group 3
Josh T., LaRatio,
Brandi, J’Nae
Group 2
Durand, Heidi, Keiara,
Erica
Group 1
Heidi, George,
Jacob, Taylor
Group 6
Quincy, Josh D., Akiya,
Rodneisha K.
Group 4
Tierra, Johnika, Howard,
Montronique
Group 9
Lashannia, Chris, Marlon
Group 8
Sedric, Angelica,
Rodneisha O.
Group 7
Shante, Jeremiah,
Tracy, Ashley
Group 5
Angel, Annquinette,
Tyler, Johneisha
Front Door
Projector4th Period
Group 3
Selena, Katie, Chasity, Holloway
Group 2
Jamal, Kevin, Brittney, Kenisha
Group 1
Kendall, Quoc, Thuy, Jemeca
Group 6
Celeste, Arthur,
Stephen, Jarion
Group 5
Frank, Hannah, Cornell,
Darniesha
Group 4
Haley, Desmond, Treshon, Jeanette
Group 9 Group 8
Taylor, Martha,
Adam, Raven
Group 7Mankisha, Tatiyaan, Deston, Brhea
Front Door
Projector5th Period
Group 3
Brianna M., Gina, Nathan,
De’Jonel
Group 2
Chassidy, Chyna, Justin,
Mason
Group 1
Breionna H., Rikki, Carlton,
Breonne
Group 6
Aujuan, Jandolyn, Ida,
Mikell
Group 5
Tyler, Granville,
Qiana, J’Don
Group 4
Jesse, Natosha, Timberly, Jasmine
Group 9
Mario, Dominique,
James
Group 8Group 7
Desman, Felix, Paul,
Stephon
Awesome Opportunity!
WHAT: 2010 Youth Summit where youth and their adult allies will join together to explore the issues that affect their communities and to identify ways they can become change agents. Educations forum on issues in criminal and juvenile
justice, including but not limited to school to prison pipeline issues, funding for community based programs versus incarceration, and police accountability.
WHEN/WHERE: Hope Academy, March 27th from 11 am to 3 pm.
BENEFITS: Students will receive EXTRA CREDIT and a CERTIFICATE at the end of each session.
Unit 3 Test…Mastery Averages
64.1%
Unit 3 Test…GLE Masters
Angel AlexanderTierra Austin
Joshua DetiegeAkiya Hart
Ashley PittmanShante Firven-Francois
Lashannia Wilson
Unit 3 Test…Mastery Averages
65.4%
Unit 3 Test…GLE Masters
Tatiyaan BaileyTaylor TilquitMartha Young
People who were really close…Holloway JonesChasity Talley
Mankisha BrownStephen JeffersonKenisha Jackson
Thuy DoTreshon Hunter
Unit 3 Test…Mastery Averages
60.8%
Unit 3 Test…GLE Masters
Breionna HillFelix Mari
People who were really close…Aujuan Brown
De’Jonel GarbuttNathan Martinez
Granville RichardsonMario Vecino
Dominique YoungCarlton Galmon
Synthesis and Decomposition
Reactions
Synthesis and Decomposition
Reactions
On the request line…
Chemical Reactions
There are 5 types of chemical hook-ups (reactions) at the prom this year.
1. Combustion2. Synthesis3. Decomposition4. Single Replacement5. Double-replacement
Let’s come together
Key Point #1: A SYNTHESIS REACTION is one in which two or more substances combine to form one new substance. A + B AB Two substances are at the Chemistry Prom,
dancing alone…they decide to hook up…
Let’s come together….
Synthesis reaction – two more substances combine to form one new substance Two substances dancing alone decide
to hook up… become a happy couple A + B ABMan I’m
lonelyGeez I
could use a mate.
Satisfaction
Practice
Show the synthesis of solid aluminum and oxygen gas. What are the reactants?
Al + O2
What are the products? It’s a synthesis reaction, so we know Al and O
are going to make a compound…. If the products aren’t in the question you need
to KRISS KROSS to figure it out!
Al (s) + O2 (g) AlOAl3+O2-Al2O3
DIATOMIC ALERT!
Practice
1. With Ms. Stroh: Write the chemical equation for the synthesis of rubidium nitride, Rb3N.
2. On your own: Write the chemical equation for the synthesis of strontium chloride.
Practice
Which reactions are SYNTHESIS reactions?
A. C + O2 CO2
B. CaO + H2O Ca(OH)2
C. H2O H2 + O2
D. 2Na + Cl2 2NaCl
E. Fe + CuSO4 FeSO4 + Cu
F. 2K3PO4 + 3H2SO4 3K2SO4 + 2H3PO4
A, B, and D
I don’t think this is working out…Key Point #2: A DECOMPOSITION REACTION is one in which one substance breaks down into multiple substances, usually with the help of some kind of heat or energy AB A + B A couple at the Chemistry Prom decides
to break up
I don’t think this is working out… Decomposition reaction – one
substance breaks into multiple substances A couple decides…well it is time to
break up AB A + B
I don’t think this is
right for us…
I want to see other people Satisfaction!
Satisfaction!
Practice
Show the decomposition water after electricity has passed through it. What are the reactants?
Water! H2O What are the products?
It’s a decomposition reaction, so we know the elements in water are going to break apart
The question will specify if any compounds are formed
H2O H + O
DIATOMIC ALERT!
H2 + O2Don’t
forget to balance!
Practice
1. With Ms. Stroh: Write the chemical equation for the decomposition of Na2S.
2. On your own: Write the chemical equation for the decomposition of VF3.
More Practice!
Which reactions are DECOMPOSITION reactions?
A. C + O2 CO2
B. CaO + H2O Ca(OH)2
C. H2O H2 + O2
D. H2SO4 H2 + S + 2O2
E. Fe + CuSO4 FeSO4 + Cu
F. K3PO4 K3P + 2O2
C, D and F
GEE Prep
Science Task:
Pile Driver
#1 Scoring notes: Possible variables to hold constant:
the mass of the weight (or the weight) the starter holes drilled in the wood
blocks (same depth or size) the kind of nail (size, composition,
mass, etc.) the kind of wood block (size,
composition, etc.)
#2 Scoring notes: Part A: Accept from 4.5 cm to 5.0 cm as reasonable.
OR… The nail will be driven into the wood a distance that is
about double that when it was dropped from 20 cm. Part B: Data for trials 4 and 6 show that when the
distance the weight falls doubles, the distance the nail is pushed into the wood also doubles. Trial 2 shows that when a 2-kg mass falls 20 cm, the nail is pushed into the wood 2.4 cm. Therefore, when the same 2-kg mass falls 40 cm, the nail should be pushed into the wood 4.8 cm (=2.4 cm × 2).
Note: Advanced students may recognize that trials 4 through 6 indicate the variables are directly proportional and explain their prediction based on a direct proportion.
#3 Scoring notes: Sample answers:
Pile drivers are much larger than the model. Pile drivers use much heavier weights than
the model. Pile drivers get their energy from burning
gasoline in a motor, not from humans lifting the weights.
Piles are driven into soil, not wood. Piles are not made of the same material as
nails. Piles don’t always have points on the ends
as the nails did.
#4 Scoring notes: Sample answers:
gravitational potential energy (or “energy of position”) when the weight is raised above tabletop
kinetic energy (or “energy of motion”) when the weight is in the process of falling
kinetic energy when the weight is in the process of being lifted
kinetic energy of nail as it moves farther into the wood after being struck
sound energy generated by the collision between the weight and the nail heat energy as a result of friction between nail and wood or string and pulley
chemical energy in the food the students ate that gave them energy to do the investigation
mechanical energy as a result of the moving parts of the pile driver
Exit Question
1. Identify the following reactions as synthesis or decomposition:
2 H2NO3 2 H2 + N2 + 3 O2
AB + C ACB2. Write the chemical equation
for the decomposition of solid magnesium oxide.
