Catalyst – March , 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  Catalyst  Chemistry Prom 2010 Day 1!  Practice and Work Time  GEE 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 DoorProjector 2nd 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 DoorProjector 4th 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 7 Mankisha, Tatiyaan, Deston, Brhea

Front DoorProjector 5th 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 8 Group 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 Alexander Tierra Austin Joshua Detiege Akiya Hart Ashley Pittman Shante Firven-Francois Lashannia Wilson

Unit 3 Test…Mastery Averages 65.4% 

Unit 3 Test…GLE Masters Tatiyaan Bailey Taylor Tilquit Martha Young People who were really close… Holloway Jones Chasity Talley Mankisha Brown Stephen Jefferson Kenisha Jackson Thuy Do Treshon Hunter

Unit 3 Test…Mastery Averages 60.8% 

Unit 3 Test…GLE Masters Breionna Hill Felix Mari People who were really close… Aujuan Brown De’Jonel Garbutt Nathan Martinez Granville Richardson Mario Vecino Dominique Young Carlton Galmon

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. Combustion 2. Synthesis 3. Decomposition 4. Single Replacement 5. 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  AB Man I’m lonely Geez I could use a mate. Satisfaction

Practice  Show the synthesis of solid aluminum and oxygen gas.  What are the reactants? Al + O 2  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) + O 2 (g)  AlOAl 3+ O 2- Al 2 O 3 DIATOMIC ALERT!

Practice 1. With Ms. Stroh: Write the chemical equation for the synthesis of rubidium nitride, Rb 3 N. 2. On your own: Write the chemical equation for the synthesis of strontium chloride.

Practice  Which reactions are SYNTHESIS reactions? A. C + O 2  CO 2 B. CaO + H 2 O  Ca(OH) 2 C. H 2 O  H 2 + O 2 D. 2Na + Cl 2  2NaCl E. Fe + CuSO 4  FeSO 4 + Cu F. 2K 3 PO 4 + 3H 2 SO 4  3K 2 SO 4 + 2H 3 PO 4 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!

Practice  Show the decomposition water after electricity has passed through it.  What are the reactants? Water! H 2 O  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 H 2 O  H + O DIATOMIC ALERT! H 2 + O 2 Don’t forget to balance!

Practice 1. With Ms. Stroh: Write the chemical equation for the decomposition of Na 2 S. 2. On your own: Write the chemical equation for the decomposition of VF 3.

More Practice!  Which reactions are DECOMPOSITION reactions? A. C + O 2  CO 2 B. CaO + H 2 O  Ca(OH) 2 C. H 2 O  H 2 + O 2 D. H 2 SO 4  H 2 + S + 2O 2 E. Fe + CuSO 4  FeSO 4 + Cu F. K 3 PO 4  K 3 P + 2O 2 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 H 2 NO 3  2 H 2 + N O 2  AB + C  ACB 2. Write the chemical equation for the decomposition of solid magnesium oxide.