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.