After class evaluations with Debre, we reviewed some topics and concepts using vocabulary cards: you were asked to organize the entire card set in a way that made sense to you and be able to explain that to me, and then to pick two or more cards and explain a connection between them.
These words were picked from the handouts and activities we've done since September, and include words that you thought were important or interesting for the class to know.
These words were picked from the handouts and activities we've done since September, and include words that you thought were important or interesting for the class to know.
Here are the word sets that some of you created, connected, and explained:
Science Process Skills To Question To Observe To Predict To Hypothezise To Plan and Investigate To Interpret To Communicate | chemical formulas atoms molecules | States or Phases of Matter To Boil To Condense To Freeze To Melt To Evaporate To Vaporize | physical properties mass weight volume melting freezing |
solution solute solvent | density (and population density) volume mass | mass matter particles | particles atoms molecules | mass weight gravity |
These are the words that no one explained to me. Buffer Bouyancy Bacteria Chemical Equation Chemical Properties Concentration Dependent Variable Independent Variable Product Reactant Saline Sublimate Turbid |
Studying Vocabulary On Your Own Use the vocabulary list handout
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We then took a more in depth look at what a chemical reaction is, using handouts and images from a lesson by the American Chemical Society.
On each table, we lit a small candle to demonstrate a chemical reaction between the candle wax and oxygen in the air, predicted what would happen to the flame when covered with a glass jar, and then tried to explain what did happen.
We watched an animation of the combustion of methane and oxygen at a a molecular level, as a model of a similar reaction. See the Resources section of this website for the images and animation we viewed.
You used atom cut-outs to model the reaction and see that all the atoms in the reactants show up in the products.
After much class discussion of the models and images, you completed a reading and question and answer handout, both titled "What is a Chemical Reaction?"
Key Concepts for Chemical Reactions:
Studying on your own:
Re-state each of the Key Concepts listed here. Do they make sense? For example, take
On each table, we lit a small candle to demonstrate a chemical reaction between the candle wax and oxygen in the air, predicted what would happen to the flame when covered with a glass jar, and then tried to explain what did happen.
We watched an animation of the combustion of methane and oxygen at a a molecular level, as a model of a similar reaction. See the Resources section of this website for the images and animation we viewed.
You used atom cut-outs to model the reaction and see that all the atoms in the reactants show up in the products.
- The large black squares were Carbon atoms
- The medium red squares were Oxygen atoms
- The small white squares were Hydrogen atoms
After much class discussion of the models and images, you completed a reading and question and answer handout, both titled "What is a Chemical Reaction?"
Key Concepts for Chemical Reactions:
- A physical change, such as a state change or dissolving, does not create a new substance, but a chemical change does.
- In a chemical reaction, the atoms and molecules that interact with each other are called reactants.
- In a chemical reaction, the atoms and molecules produced by the reaction are called products.
- In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed.
- In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
Studying on your own:
Re-state each of the Key Concepts listed here. Do they make sense? For example, take
- In a chemical reaction, the atoms and molecules that interact with each other are called reactants.
- Reactants are the substances (atoms and molecules) that interact with each other in a chemical reaction.
Options for the last part of class: Keep working on the yellow packet from a HiSET workbook, on scientific methods and processes. Review resources and links on the class website. Read through the "Classtime" account of what we've done since September. Send me a list (on paper or through the Communications page) of some or all of these items:
| Handouts from today's class:
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