Matter, Change, and Scientific Measurements

Fundamental Concepts of Matter

• Definition of Matter:

  • Matter is defined as anything that possesses mass and takes up space (occupies volume).

  • Matter encompasses everything that can be directly observed, as well as substances that are invisible to the naked eye under certain conditions (such as dissolved gases or air).

  • Non-Matter Exclusions: Forms of energy such as light and electricity do not have mass or volume, and therefore are NOT matter.

• States of Matter:

  • Solid:

  • Characterized by having a definite shape and a definite volume.

  • Particles are packed closely together in fixed, rigid arrangements.

  • Liquid:

  • Characterized by having a not defined (indefinite) shape and a defined (definite) volume.

  • Takes the shape of the container it occupies while maintaining a constant volume.

  • Gas:

  • Characterized by having a not defined (indefinite) shape and a not defined (indefinite) volume.

  • Will expand or compress to fill any space or container available.

  • Plasma:

  • A fourth high-energy ionized state of matter (not covered in standard introductory scope).

• Interconvertibility of States:

  • Any form or substance can potentially exist in all three primary physical states depending on environmental conditions such as temperature and pressure.

  • Water Example:

  • Normal ambient state: Liquid water ($H_2O_{(l)}$).

  • Solid state: Ice ($H_2O_{(s)}$).

  • Gas state: Steam or water vapor ($H_2O_{(g)}$).

Element Names and Chemical Symbols

• Rules for Naming and Symbols:

  • Element Names: Precise spelling is mandatory in chemical notation.

  • Single-Letter Symbols: Must always be capitalized (e.g., Hydrogen = $H$, Oxygen = $O$).

  • Two-Letter Symbols: Must begin with an upper-case letter followed strictly by a lower-case letter (e.g., Cobalt = $Co$).

• Distinction Between Capitalizations:

  • Two uppercase letters placed together denote a compound consisting of two separate combined elements.

  • Example: $CO$ represents the chemical compound Carbon Monoxide (one carbon atom and one oxygen atom).

  • One uppercase letter followed by a lowercase letter represents a single individual element.

  • Example: $Co$ represents the transition metal element Cobalt.

  • The preferred standard convention is the American / IUPAC notation system.

• Latin-Based Chemical Symbols:

  • Many element symbols are derived from their classical Latin names:

  • Gold: Derived from aurum, chemical symbol $Au$.

  • Silver: Derived from argentum, chemical symbol $Ag$.

  • Lead: Derived from plumbum, chemical symbol $Pb$.

The Periodic Table of Elements

• Required Knowledge Criteria:

  • Knowledge requirements focus on recognizing and pairing the element name and chemical symbol.

  • Memorizing atomic numbers or specific grid coordinates on the periodic table is not required.

• Comprehensive Required Elements List:

  • Hydrogen ($H$), Helium ($He$)

  • Lithium ($Li$), Beryllium ($Be$)

  • Boron ($B$), Carbon ($C$), Nitrogen ($N$), Oxygen ($O$), Fluorine ($F$), Neon ($Ne$)

  • Sodium ($Na$), Magnesium ($Mg$), Aluminum ($Al$), Silicon ($Si$), Phosphorus ($P$), Sulfur ($S$), Chlorine ($Cl$), Argon ($Ar$)

  • Potassium ($K$), Calcium ($Ca$), Scandium ($Sc$), Titanium ($Ti$), Vanadium ($V$), Chromium ($Cr$), Manganese ($Mn$), Iron ($Fe$), Cobalt ($Co$), Nickel ($Ni$), Copper ($Cu$), Zinc ($Zn$), Gallium ($Ga$), Germanium ($Ge$), Arsenic ($As$), Selenium ($Se$), Bromine ($Br$), Krypton ($Kr$)

  • Rubidium ($Rb$), Strontium ($Sr$), Yttrium ($Y$), Zirconium ($Zr$), Niobium ($Nb$), Molybdenum ($Mo$), Technetium ($Tc$), Ruthenium ($Ru$), Rhodium ($Rh$), Palladium ($Pd$), Silver ($Ag$), Cadmium ($Cd$), Indium ($In$), Tin ($Sn$), Antimony ($Sb$), Tellurium ($Te$), Iodine ($I$), Xenon ($Xe$)

  • Cesium ($Cs$), Barium ($Ba$), Lanthanum ($La$), Hafnium ($Hf$), Tantalum ($Ta$), Tungsten ($W$), Rhenium ($Re$), Osmium ($Os$), Iridium ($Ir$), Platinum ($Pt$), Gold ($Au$), Mercury ($Hg$), Thallium ($Tl$), Lead ($Pb$), Bismuth ($Bi$), Polonium ($Po$), Astatine ($At$), Radon ($Rn$)

  • Francium ($Fr$), Radium ($Ra$), Actinium ($Ac$)

  • Uranium ($U$)

Physical and Chemical Properties

• Physical Properties:

  • Defined as properties that can be directly measured or observed without altering the chemical composition or identity of the substance.

  • Classified further into extensive or intensive properties.

  • Examples:

  • A sample has a mass of $75\,g$ (Physical Property).

  • A substance melts at $10\,^\circ\text{C}$ (Physical Property).

• Chemical Properties:

  • Defined as properties that describe the reactivity of a substance or its capability to form new chemical substances.

  • Can only be determined or observed by carrying out a chemical reaction.

  • Key Descriptive Vocabulary:

  • Reacts

  • Decomposes

  • Reacts to form

  • Example:

  • A substance decomposes to form carbon dioxide ($CO_2$) and water ($H_2O$) (Chemical Property).

Extensive vs. Intensive Properties and Mass vs. Weight

• Extensive Properties:

  • Depend directly on the size or quantity (amount) of matter in the sample.

  • Examples:

  • Mass: Extensive property.

  • Weight: Extensive property.

• Intensive Properties:

  • Do NOT depend on the size, volume, or quantity of matter in the sample.

  • Examples:

  • Boiling Point: Intensive property.

  • Temperature: Intensive property.

  • Color: Intensive property.

• Mass versus Weight Distinction:

  • Mass: The fundamental quantity measuring the exact amount of matter inside an object; remains constant regardless of gravitational forces or location.

  • Weight: The pull of force exerted on a given mass by gravity ($F_g = m \times g$); varies depending on the strength of the surrounding gravitational field.