Learning Target: Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.

Must Do: Use iPads to Google and read about Decomposition and Synthesis reactions. Write down your interpretations and think about how you would write equations for the decomposition and synthesis of water.

10th Grade Chemistry: 1/27/14

Agenda:•Must Do•WWK•Brief Lesson/video•iPad Chem Mahjong Smack down

Puzzle Warm-up

WWK

+L L

L

Fuel CellFuel cell

A device that produces electricity by combining a fuel, usually hydrogen, with oxygen. In this reaction, electrons are freed from the hydrogen in the fuel cell by a catalyst, and gain energy from the chemical reaction binding hydrogen and oxygen; this provides a source for electric current.

Noun

a device that produces a continuous electric current directly from the oxidation of a fuel, as that of hydrogen by oxygen.

Goal for this unitWrite a complete and balanced chemical

equation from a prompt Example: Write the chemical equation for the

reaction of Magnesium metal and Chlorine gas to form magnesium chlorideBalance the reaction

What type of reaction is this?

Reaction ClassificationFive Types or Reactions (VIDEO)

Decomposition

Synthesis

Single Replacement

Double Replacement

Combustion

Decomposition NI3 I2 + N2

The starting material (reactant) in this case is a VERY unstable and highly explosive solid…too unstable to use as an explosive.

Whilst we wait for the Ammonium hydroxide and iodine to be delivered to my house (I’m sure I’m on HSA’s watch list now) this video will give you a good preview.

2H2O 2H2 + O2

This reaction takes a lot of energy to drive from reactant to product (luckily!)

Can you think of a process that we use to drive this reaction forward? It’s one of your vocabulary words.

Electrolysis We can drive the decomposition of water with

an electric current.

Video Link

When a potential greater than 2.06 V is applied such that the forward cell has a positive potential, the following reactions take place.

SynthesisWe discussed how the reaction

2H2 + O2 2H2O

is a synthesis reaction. This reaction is classified as spontaneous, though H2 and O2 will react very slowly unless some energy (a spark) is applied to the mixture (this is formally called “activation energy”).

Can you think of a way to use this reaction to generate electrical energy?

Fuel Cell!!

Chem Mahjong!I’ve loaded the Chem Mahjong app on all the

iPads I know that sounds pretty nerdy, but it’s kind of

funHigh score gets bragging rights…maybe some

chocolate.The one to play is the polyatomic ions in x-board

format.The goal is to help you to memorize the formulas

in a way that isn’t as painful, and dreadfully boring as flash cards.