Recording-2025-03-12T22:05:22.438Z

Quantitative vs. Qualitative Data

• Quantitative Data

  • Refers to numerical information that can be measured or counted.

  • Examples include height, weight, temperature, and the number of items.

  • Usually represented in graphs, tables, or statistical analyses.

  • Objective in nature; relies on measurable criteria which can provide definitive conclusions.

• Qualitative Data

  • Refers to descriptive information that cannot be measured numerically but is categorized based on qualities or characteristics.

  • Examples include color, texture, taste, and opinion.

  • Usually presented in the form of narratives, images, or descriptive statistics.

  • Subjective in nature; relies on personal interpretations, observations, and experiences.

Physical Change vs. Chemical Change

• Physical Change

  • A change that affects one or more physical properties of a substance without altering its chemical composition.

  • Examples include changing states (solid to liquid to gas), dissolving, and breaking or tearing.

  • Generally reversible changes, e.g., ice melting can be frozen back into ice.

  • No new substances are produced in a physical change.

• Chemical Change

  • A change that occurs when one or more substances are transformed into different substances with distinct chemical properties.

  • Indicators include color change, gas production (bubbles), temperature change, and the formation of precipitates (solid from a solution).

  • Generally irreversible under normal circumstances, e.g., burning paper cannot return to its original form.

  • New substances are formed as a result of the chemical reactions involved.