Physical Science Notes
SPS5: Phases of matter, solutions, acids, and bases.
a: Compare and contrast models of particle arrangement and motion in solids, liquids, gases, and plasmas by asking questions.
Solids have closely packed particles that vibrate in place, leading to a fixed shape and volume.
Liquids have particles that are close together but can move freely, allowing them to take the shape of their container while maintaining a fixed volume.
Gases have widely spaced particles that move rapidly and independently, filling the available space and having neither a fixed shape nor volume.
Plasmas are ionized gases with free-moving charged particles, found commonly in stars and neon lights, exhibiting unique behaviors due to electromagnetic forces.
Consider the differences in particle arrangement and kinetic energy among the states of matter.
b: Investigate the relationships among temperature, pressure, volume, and density of gases in closed systems.
Concentrate on a conceptual understanding of the ideal gas law, PV = nRT, without requiring complex calculations, focusing instead on the qualitative effects of changing temperature and pressure on a gas’s volume and density.
Discuss how increasing temperature generally increases the pressure of a gas if volume is held constant (Gay-Lussac's Law) and how volume expands with heat under constant pressure (Charles's Law).
Chemistry: Atomic Structure & Periodic Table (6 Weeks)
SPS6: Properties of solutions, acids, and bases.
a: Develop and use models to explain solution properties: solute/solvent, conductivity, and concentration.
Define Solution: A homogeneous mixture where a solute is uniformly dissolved in a solvent.
Clarify Solute: The substance being dissolved, such as salt in water.
Clarify Solvent: The substance in which the solute is dissolved, such as water in saline solutions.
Describe Conductivity: The ability of a solution to conduct electricity, which is dependent on the presence of free ions or charged particles in the solution, highlighting examples like saltwater versus pure water.
Explain Concentration: The amount of solute present in a given volume of solvent, typically expressed in terms like molarity (moles per liter).
b: Investigate how temperature, surface area, and agitation affect the rate at which solutes dissolve.
Discuss how increasing temperature generally increases the rate of dissolving for solids, enhancing solubility by providing particles with more kinetic energy, while it can decrease for gases due to reduced solubility at higher temperatures.
State that increasing surface area (e.g., using powdered solute rather than large crystals) augments the speed of dissolving because more particles are exposed to the solvent at any given time.
Elaborate on how agitation, such as stirring or shaking, promotes faster dissolution by mixing solutes with solvents more effectively, thus accelerating the process.
c: Analyze solubility curves to determine the effect of temperature on solubility.
Explain Solubility Curve: A graphical representation showing the solubility of a solute at various temperatures, allowing for visual interpretation of how solubility changes with temperature.
Discuss the concept of saturation, indicating the maximum amount of solute that can be dissolved in a solvent at a specific temperature, defining supersaturation as a state where more solute is dissolved than typically possible at that temperature.
d: Explain the relationship between the structure and properties (pH, color change with indicators) of acids and bases.
Elaborate on Acids: Substances that donate protons (H+) in water, typically having a pH less than 7, and their characteristics, including a sour taste and their ability to corrode metals.
Discuss Bases: Substances that accept protons (H+) or donate hydroxide ions (OH-) in water, with a pH greater than 7, and characteristics like a slippery feel and bitter taste.
Define Indicators: Substances that change color as the pH of the solution changes, such as litmus paper and phenolphthalein, providing specific examples and the pH ranges at which color changes occur.
Provide examples of Simple Acids such as HCl (hydrochloric acid) and Simple Bases such as NaOH (sodium hydroxide), discussing their common uses in laboratories and households.
e: Classify common household substances as acidic, basic, or neutral.
Discuss how to use indicators like litmus paper or