Chemical reactions
Solvents, solutes an solutions; mixtures
Acids and bases
putting it all together!
Key Concepts - Chemical Reactions
Key Concepts - Controlling the Amount of Reactant in a Chemical Reaction
Key Concepts - Using Chemical Change to Identify an Unknown
Key Concepts - pH and Color Change
- 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.
Key Concepts - Controlling the Amount of Reactant in a Chemical Reaction
- Changing the amount of reactants affects the amount of products produced in a chemical reaction.
- In a chemical reaction, only the atoms present in the reactants can end up in the products.
- Mass is conserved in a chemical reaction.
Key Concepts - Using Chemical Change to Identify an Unknown
- Substances react chemically in characteristic ways
- A set of reactions can be used to identify an unknown substance
Key Concepts - pH and Color Change
- Whether a solution is acidic or basic can be measured on the pH scale, which is a scale of 1 to 14.
- A solution with a pH of 7, like water, is called a neutral solution.
- Acidic solutions have a pH below 7 on the pH scale (1-6).
- Basic solutions have a pH above 7 on the pH scale (8-14).
- When a(n) universal indicator (such as cabbage juice or a pH strip) is added to a solution, the color change can indicate the approximate pH of the solution.
- Acids cause a universal indicator solution such as cabbage juice to change from green (basic) toward red .
- Bases cause a universal indicator solution such as cabbage juice to change from green toward purple.
- Water molecules (H2O) can interact with one another to form H3O+ ions and OH− ions.
Class Assignments - See also RenWeb
Lesson 1 - Observing Chemical Reactions
Lesson 1 - Observing Chemical Reactions answer key
Lesson 2 - Describing Chemical Reactions
Lesson 2 - Describing Chemical Reactions answer key
Lesson 3 - Controlling Chemical Reactions
Lesson 3 - Controlling Chemical Reactions answer key
Main Types of Chemical Reactions
Chemical Reactions - student reading (middleschoolchemistry.com)
Power Points
Chemical Reactions by sciencespot.net
Links for Media Used or Referenced in Class
Chemical Reaction - Combustion of Methane by middleschoolchemistry.com
Chemical Reactions - How stuff works
Video Chemistry - Mixtures and Solutions
Alien Juice Bar - pH universal indicator challenges 1, 2, and 3
Other Cool Stuff Related to This Lesson
Lesson 1 - Observing Chemical Reactions
Lesson 1 - Observing Chemical Reactions answer key
Lesson 2 - Describing Chemical Reactions
Lesson 2 - Describing Chemical Reactions answer key
Lesson 3 - Controlling Chemical Reactions
Lesson 3 - Controlling Chemical Reactions answer key
Main Types of Chemical Reactions
Chemical Reactions - student reading (middleschoolchemistry.com)
Power Points
Chemical Reactions by sciencespot.net
Links for Media Used or Referenced in Class
Chemical Reaction - Combustion of Methane by middleschoolchemistry.com
Chemical Reactions - How stuff works
Video Chemistry - Mixtures and Solutions
Alien Juice Bar - pH universal indicator challenges 1, 2, and 3
Other Cool Stuff Related to This Lesson