Day 13 (5/27/2016)

posted May 27, 2016, 10:23 AM by Brooke Winter-DiGirolamo

LT: I can determine the best pair of metals to use in an electrochemical cell.

THM: Voltaic Cell
Makes electric energy using chemical energy.
- The Anode is losing electrons, giving them up. (The best oxidizer is Lithium). Positive.
- The Cathode is gaining electrons, catching them. (The best reducer is Gold). Negative. This is the side that will gain in size, produce more metal. 

Day 13 (5/26/2016)

posted May 26, 2016, 10:27 AM by Brooke Winter-DiGirolamo

LT: I can explain how electron transfer can help generate electricity.

THM: Oxidation Reduction
- When metals are exposed to oxygen and form metal oxides
- Produces energy
- Metals always lose electrons (They are oxidized)
- Non metals always gain electrons (they are reduced)
- LEO says GER
- (lose electrons oxidize, gain electrons is reduced)

Day 12 (5/24/2016)

posted May 24, 2016, 10:20 AM by Brooke Winter-DiGirolamo

LT: I can explain hot to lower activation energy using collision theory. 

THM: Activation Energy
- The amount of energy needed to start any chemical reaction (either exothermic or endothermic)

- Used to break the chemical bonds of the reactants. 

- Catalyst- A compound that lowers activation energy, speeding up the reaction. (Example is KI (potassium iodide) 

Collision Theory: 
- Facing the other molecules of the reaction.
- Moving with enough force to react

Day 11 (5/23/2016)

posted May 23, 2016, 12:12 PM by Brooke Winter-DiGirolamo

LT: I can explain why some reactions are exo and some are endothermic.

THM: Bond Energy and Net Energy
- Breaking bonds uses energy. - endothermic
- Forming bonds releases energy. -exothermic

- Delta H = Net Energy = The difference between the energy going in, and the energy coming out.  (Table I)

Day 10 (5/19/16)

posted May 19, 2016, 10:28 AM by Brooke Winter-DiGirolamo

LT: I can explain how heat is transferred in chemical reactions.

THM: Heat Transfer
- Triangle H= Change in heat
- When heat energy moves
- In reaction A, the heat was traveling from inside of the reaction out to your hand, and it felt warm.
    - Heat moving from the system to the surroundings (the glass, our hand, the air, the water)
- In reaction B, the heat was traveling from your hand into the beaker. In chemistry, instead of saying something is cold, we say it was losing heat.
    - Heat energy moves from the surrounding into the system. 

THM: Delta H is negative
- Temperature increase outside the system.
- Heat is lost to the surroundings. 
- Energy is being produced more than used.
- Reaction A.
Endothermic: Delta H is positive
- Heat is being used more than produced.
- Heat energy is going into the system.
- Heat energy is being absorbed. 

Day 9 (5/17/16)

posted May 17, 2016, 10:01 AM by Brooke Winter-DiGirolamo   [ updated May 17, 2016, 10:14 AM ]

LT: I can evaluate liquids and pipe materials for the binary cycle using specific heat capacity.

Heat Energy: Measured in Joules
- The ability to do work. 
    - Separate molecules
    - Make them move faster
    - Change phase
    - Transform into energy- Kinetic, mechanical, and eventually electricity
- We want to use less heat energy to be efficient. 
Specific Heat Capacity: 
- The amount of heat it takes to increase the temperature

Calculating Heat:
q= mC(change in T)

q= heat, m= mass, C= Specific Heat Capacity

Day 6 (5/12/16)

posted May 12, 2016, 9:45 AM by Brooke Winter-DiGirolamo

LT: I can evaluate the impact of both pressure and temperature on volume. 

THM- Combined Gas Law: (Combines Charles' Law and Boyle's Law)

V1 x P1 / T1 = V2 x P2 / T2

Day 5 (5/9/16)

posted May 9, 2016, 12:03 PM by Brooke Winter-DiGirolamo

LT: I can explain the mathematical relationship between pressure and volume and temperature using data.


Boyles Law:
Volume and Pressure-
- As volume goes down, pressure goes up.
- As particles have less space, they bump into each other more. 
- V1 x P1 = V2 x P2
    - Inverse proportion/ relationship (As one goes down, the other goes up)

Gay-Lussac's Law:
Pressure and Temperature-
- As temperature increases, pressure increase.
- Particles go faster, and hit each other more.
- P1 / T1 = P2 / T2
    - Proportional relationship (As one goes up, the other goes up) 

Day 4 (5/6/16)

posted May 6, 2016, 10:07 AM by Brooke Winter-DiGirolamo   [ updated May 6, 2016, 10:23 AM ]

LT: I can explain pressure in terms of particles and their impact on matter.

1. Where is there air trapped in each of the three experiments?
2. How are the experiments similar to each other?
3. What evidence is there in each experiment that shows that air molecules can exert a force on other matter? 

- A force that can push matter 
- The molecules move, they bump into each other, the wall, etc., and this bump creates a force. 
-When the volume decreases, the force is stronger because hit each other more- they have less space to move around in.
Air Pressure: 
- Also called atmospheric pressure
- Caused by the mass of air.

Day 3 (5/5/16)

posted May 6, 2016, 9:38 AM by Brooke Winter-DiGirolamo

THM: Charles Law
—Relationship- An increase in temperature has a proportional increase in volume.


1-10 of 12