Science

Basic Concepts: Charge (positive and negative), conductors and insulators.
Current and Voltage: Definition and differences between direct and alternating current.
Simple Circuits: Components of a circuit (battery, wires, switch, load), series vs. parallel circuits.
Ohm's Law: Understanding the relationship between voltage (V), current (I), and resistance (R).
Electromagnetism: Basics of magnetism and how electric currents produce magnetic fields.

Cell Life Cycle: Stages of cell division: interphase, mitosis (prophase, metaphase, anaphase, telophase), and cytokinesis.
Parts of a Plant: Major structures include roots, stems, leaves, flowers, and seeds; their functions in growth and reproduction.
Asexual and Sexual Reproduction: Definitions, examples, and differences; advantages and disadvantages of each type.
Cancer: Definition, causes, types, and the role of mutations in normal cell growth and division.
Genetics: Basic concepts of heredity, DNA structure, and the importance of genes; Punnett squares for predicting traits.
Human Reproduction: Overview of reproductive systems, processes of fertilization, pregnancy, and childbirth.

Structure of the Universe: Solar system components, stars, galaxies, and the universe's structure.
Earth's Place in Space: Rotation, revolution, and the effects on day/night, seasons.
Phases of the Moon: Understanding lunar phases and eclipses.
Space Exploration: History and significance of space missions; current technologies in space exploration.
Gravity and Orbits: The role of gravity in the solar system and how it affects planetary movement.

Matter
- Pure Substances
  - Elements
  - Compounds
- Mixtures
  - Homogeneous
  - Heterogeneous

Physical Changes: Changes that do not alter the chemical composition of a substance.
- Examples: melting, freezing, boiling, dissolving.
Chemical Changes: Changes that result in the formation of new substances.
- Signs include: color change, gas production, temperature change, and precipitate formation.
Physical Properties: Properties that can be observed without changing the substance.
- Examples: color, odor, melting point, boiling point, density.
Chemical Properties: Properties that describe the ability of a substance to undergo changes.
- Examples: reactivity with acids, flammability.

John Dalton: Proposed the atomic theory; suggested that all matter is made up of small, indivisible particles called atoms and introduced the concept of atomic weights.
J.J. Thomson: Discovered the electron using the cathode ray tube experiment; proposed the plum pudding model of the atom, where electrons are embedded in a positively charged sphere.
Ernest Rutherford: Conducted the gold foil experiment, leading to the discovery of the atomic nucleus; proposed a model of the atom with a dense nucleus surrounded by electrons.
Niels Bohr: Developed the Bohr model of the atom, which introduced the idea of quantized energy levels for electrons; described how electrons orbit the nucleus at specific distances.

Visual representations of the atom showing the nucleus (protons and neutrons) and electrons in their specific energy levels (shells) around the nucleus.
Each shell can hold a certain number of electrons: 1st shell (2), 2nd shell (8), 3rd shell (18).

Groups (Columns): Vertical columns in the periodic table, elements in the same group share similar chemical properties.
- Examples: Group 1 (alkali metals), Group 17 (halogens).
Periods (Rows): Horizontal rows in the periodic table, where properties change progressively across the row.
Families: Groupings of elements that share similar characteristics.
Metals: Typically found on the left side of the periodic table; good conductors of heat and electricity, malleable, ductile.
Nonmetals: Found on the right side; generally poor conductors, brittle in solid form.
Metalloids: Elements that exhibit properties of both metals and nonmetals; found along the stair-step line between metals and nonmetals.