7th Grade Science Trimester 3 Comprehensive Study Guide

Science Exam Date: Thursday, May 21.
Social Studies Exam Date: Thursday, May 21.
ELA, Math, and Religion Exams Date: Friday, May 22.
Preparation Timeline: It is strongly recommended to begin studying at least one week prior to the science exam.

Flashcards: Create cards for all important vocabulary terms. One side should feature the term, while the other side contains one specific definition and a practical example.
Notes Summary: Review all class notes and the specific textbook lessons provided in the syllabus. Write a one-paragraph summary for every lesson in your own words to ensure comprehension.
Textbook Review Pages: Complete all review pages found at the end of each lesson and unit in the textbook if they have not been finished already.
Comprehensive Study Guide: Compile a document that lists and defines all important terms and vocabulary, combined with summarized notes from both the textbook and class sessions.
Peer Teaching: Assume the role of the expert. Select a topic from the exam material and teach it to a friend or family member, focusing on sharing essential information and illustrative examples.
Podcast Creation: Write a script or record an audio segment explaining a specific topic as if teaching a listener. This reinforces the "expert" mindset and aids in information retention.

Lesson 1: Earth’s Days, Years, and Seasons (Pages 288-297): Covers the mechanics of Earth's rotation ( $24$ hours for a day) and revolution around the Sun ( $365.25$ days for a year). Explains how the tilt of the Earth's axis ( $23.5^{\circ}$ ) relative to its orbit causes seasonal changes in sunlight intensity and duration.
Lesson 2: Moon Phases and Eclipses (Pages 300-309): Details the lunar cycle and why the Moon appears to change shape from Earth. Discusses the alignment required for solar and lunar eclipses.
Lesson 3: Earth’s Tides (Pages 314-324): Explores the gravitational interactions between the Earth, Moon, and Sun.
- Cause of Tides: Tides are the periodic rise and fall of ocean levels caused primarily by the gravitational pull of the Moon and, to a lesser extent, the Sun.
- High and Low Tides: As the Earth rotates, different coastal areas move through the "bulges" of water created by gravity. When a location is aligned with the Moon, it experiences a high tide; when it is between bulges, it experiences a low tide.

Lesson 1: Photosynthesis and Cellular Respiration (Pages 334-345):
- Photosynthesis: The process by which plants (producers) capture energy from sunlight to convert water and carbon dioxide into food (glucose). This allows plants to grow toward light sources.
- Cellular Respiration: The process by which both plants and animals break down food molecules to release stored chemical energy for survival and growth.
Lesson 2: Ecology and Energy Transfer (Pages 346-359): Examines how energy moves through an ecosystem, often illustrated via food chains and food webs.
Lesson 3: Energy and Matter in Ecosystems: Focuses on the cycling of matter and the flow of energy from the Sun through various trophic levels.
Lesson 6: Population Dynamics (Page 410): Specifically looks at factors that influence the size and health of a population.
- Biotic Factors: Living components that affect survival, such as predators, competition for food, and disease.
- Abiotic Factors: Non-living components that influence the ecosystem, such as rainfall amounts, temperature ranges, and levels of pollution.
- Case Study (Frogs): A decrease in a frog population in a wetland biome can be attributed to abiotic factors (less rainfall leading to habitat loss, higher temperatures, chemical pollution from farms) and biotic factors (an increase in the number of predators).

Lesson 1: Physical and Chemical Changes (Pages 438-449): Distinguishes between changes that alter the appearance of a substance without changing its identity (physical) and changes that result in the formation of new substances (chemical).
Lesson 2: The Atom (Pages 450-461): Introduction to the fundamental building blocks of matter, including subatomic particles (protons, neutrons, electrons).
Lesson 3: The Periodic Table (Pages 462-473): How elements are organized based on their chemical properties and atomic structure.
Lesson 4: Chemical Reactions (Pages 474-485): Focuses on the observable evidence of chemical changes.
- Evidence of Reactions: Changes in physical properties that indicate a chemical reaction has occurred include color changes, the production of a gas (bubbling), the formation of a precipitate (solid forming from liquids), and changes in energy (heat being released or absorbed).

Lesson 1: Energy Transformation and Transfer (Pages 536-547):
- Energy Transformation: The process of energy changing from one form to another (e.g., chemical energy in food becoming kinetic energy in movement).
- Energy Transfer: The movement of energy from one object or system to another.
- Forms of Energy Transfer:
  1. Conduction: Transfer of energy through direct contact between substances.
  2. Radiation: Transfer of energy through electromagnetic waves (e.g., heat from the Sun).
Lesson 4: Waves and Energy (Pages 572-581): Discusses how waves (such as sound or light) carry energy from one place to another without moving matter over long distances.
Lesson 5: Electric Current (Pages 590-593): Covers the flow of electric charge through a conductor and how it serves as a form of energy used in modern technology.

1. Tides in Coastal Towns: Fishermen must plan around tides because the ocean rises and falls predictably. Tides are caused by the gravitational pull of the Moon and Sun on Earth's oceans. High tides occur when a location is in the tidal bulge (aligned with the pull), and low tides occur when the location has rotated away from the bulge.
2. Energy Acquisition in Plants and Animals: Plants use photosynthesis to convert solar energy into glucose, enabling them to survive without consuming other organisms. Animals cannot make their own food; they must consume other organisms and use cellular respiration to break down those nutrients into usable energy.
3. Population Dynamics in Biomes: Organism survival is influenced by two factors. Abiotic factors in the frog example include environmental conditions like rainfall, temperature, and farm pollution. Biotic factors include biological pressures like predators. Changes in any of these can lead to population decreases.
4. Evidence of Chemical Reactions: To identify a chemical reaction, look for changes in physical properties such as a sudden change in color, the emergence of an odor, the release of gas bubbles, or a change in temperature that was not caused by an external heat source.
5. Forms of Energy Transfer: Two primary forms include radiation (energy moving in the form of waves) and conduction (energy moving via direct contact between particles).