CK-12 Foundation
Ck 12: Life Science: Flow of Energy
[Free Registration/Login may be required to access all resource tools.] When an herbivore eats a plant, the energy in the plant tissues is used by the herbivore. Every time energy is transferred from one organism to another, there is a...
CK-12 Foundation
Ck 12: Life Science: Competition
[Free Registration/Login may be required to access all resource tools.] Ecology is the study of how living organisms interact with each other and with their environment. Organisms interact with each other through various mechanisms, one...
CK-12 Foundation
Ck 12: Life Science: Food Chains and Food Webs: Food Webs
[Free Registration/Login may be required to access all resource tools.] Energy must constantly flow through an ecosystem for the system to remain stable. What exactly does this mean? Essentially, it means that organisms must eat other...
CK-12 Foundation
Ck 12: Life Science: Touch
[Free Registration/Login may be required to access all resource tools.] It might sound good to you to have a condition where you feel no pain. But actually this type of condition would be very dangerous. What would happen if you strained...
CK-12 Foundation
Ck 12: Life Science: Succession
[Free Registration/Login may be required to access all resource tools.] Ecosystems are "dynamic." This means that ecosystems change over time. Both natural forces and human actions cause ecosystems to change. Learn more about succession...
CK-12 Foundation
Ck 12: Life Science: Natural Selection
[Free Registration/Login may be required to access all resource tools.] The theory of evolution by natural selection means that the inherited traits of a population change over time. Inherited traits are features that are passed from one...
CK-12 Foundation
Ck 12: Life Science: Fossils
[Free Registration/Login may be required to access all resource tools.] Fossils are the preserved remains of animals, plants, and other organisms from the distant past. By studying fossils, evidence for evolution is revealed....
CK-12 Foundation
Ck 12: Third Grade Science
[Free Registration/Login may be required to access all resource tools.] This is a science text for Grade 3. It has sections on physical science, earth science, and life science. Each of those is broken down into 3 to 5 topics.
CK-12 Foundation
Ck 12: Fourth Grade Science
[Free Registration/Login may be required to access all resource tools.] This is a science text for Grade 4. It has sections on physical science, earth science, and life science. Each of those is broken down into eleven or twelve topics.
CK-12 Foundation
Ck 12: Fifth Grade Science
[Free Registration/Login may be required to access all resource tools.] This is a science text for Grade 5. It has sections on physical science, earth science, and life science. The first two are broken down into eleven topics each, and...
CK-12 Foundation
Ck 12: Interactive Algebra 1 for Ccss
This is a complete, full-year Algebra 1 course with interactivity included in every lesson. Some lessons include videos, and all include interactives and inline questions that offer instant, per-answer feedback. Every lesson also has...
CK-12 Foundation
Ck 12: Interactive Middle School Math 8 for Ccss
A complete CCSS Grade 8 Mathematics course that includes interactives in every lesson, plus videos, hands-on activities, and questions with immediate feedback. Every lesson also has specifically chosen 'Related Modalities' that teach the...
CK-12 Foundation
Ck 12: Interactive Middle School Math 7 for Ccss
A complete CCSS Grade 7 Mathematics course that includes interactives in every lesson, plus videos, hands-on activities, and questions with immediate feedback. Every lesson also has specifically chosen 'Related Modalities' that teach the...
CK-12 Foundation
Ck 12: Plant Cell Structures
[Free Registration/Login may be required to access all resource tools.] Exercise provides an overview of special structures found in plant cells. It explains the function of the cell wall, explores the role of the central vacuole, and...
CK-12 Foundation
Ck 12: Light Reactions of Photosynthesis
[Free Registration/Login may be required to access all resource tools.] The first stage of photosynthesis, light reactions, is summarized. The steps are listed, photolysis and the role of ATP synthase is explained, and how the energy of...
CK-12 Foundation
Ck 12: Calvin Cycle
[Free Registration/Login may be required to access all resource tools.] The second stage of photosynthesis, the Calvin Cycle, is described. Students will learn how to write the overall photosynthesis equation, explain RuBisCo, describe...
CK-12 Foundation
Ck 12: Acid Base Definitions
[Free Registration/Login may be required to access all resource tools.] In this module, define acids and bases and distinguish between Arrhenius and Bronsted-Lowry definitions to predict products in acid-base reactions that form water.
CK-12 Foundation
Ck 12: The P H Concept
[Free Registration/Login may be required to access all resource tools.] In this module, students will define pH and use the hydrogen or hydroxide ion concentrations to calculate the pH of a solution. They will also differentiate among...
CK-12 Foundation
Ck 12: Acid and Base Strength
[Free Registration/Login may be required to access all resource tools.] Help distinguish between degrees of dissociation for strong and weak acids and bases, and then define pH and use the hydrogen or hydroxide ion concentrations to...
CK-12 Foundation
Ck 12: Acid Base Neutralization
[Free Registration/Login may be required to access all resource tools.] Students will understand and differentiate among acid-base reactions, precipitation reactions, and oxidation-reduction reactions.
CK-12 Foundation
Ck 12: Salt Solutions
[Free Registration/Login may be required to access all resource tools.] Students begin by predicting whether a salt solution is acidic, basic, or neutral, and then practice writing balanced equations for hydrolysis reactions. They also...
CK-12 Foundation
Ck 12: Mole Ratios
[Free Registration/Login may be required to access all resource tools.] In this learning module, students will learn how to calculate and account for the amounts of reactants and products in a given chemical reaction.
CK-12 Foundation
Ck 12: Limiting Reactant and Percent Yield
[Free Registration/Login may be required to access all resource tools.] Students will compare theoretical yield to actual yield, and then investigate what happens when one reactant runs out before the other reactants are fully consumed....
CK-12 Foundation
Ck 12: Simple Pendulum
[Free Registration/Login may be required to access all resource tools.] Students understand the mechanics of a simple pendulum, and solve problems involving a simple pendulum.