Derived SI Units Quiz

Introduction to Chemistry

• Chemistry studies matter and its transformations, playing a critical role in science and technology.
• Influences daily life in health, energy, materials, and agriculture.
• Employs the scientific method involving experiments, data collection, interpretation, hypothesis formulation, and theory development.

Measurement

• SI Units: The Système International d’Unités (SI) is the most widely used measurement system with seven basic physical quantities:

  • Mass: Kilogram (Kg)
  • Length: Meter (m)
  • Time: Second (s)
  • Electric current: Ampere (A)
  • Temperature: Kelvin (K)
  • Luminous intensity: Candela (cd)
  • Amount of substance: Mole (mol)

• Derived SI Units: Other units can be derived from basic SI units:

  • Area: Square Meter (m²)
  • Volume: Cubic Meter (m³)
  • Speed: Meter per second (m/s)
  • Density: Kilogram per cubic meter (kg/m³)

• Non-SI Units: Frequently encountered non-SI units include:

  • Mass: Pounds (lb), tonnes (t)
  • Length: Feet, inches, miles
  • Temperature: Degrees Celsius (°C)
  • Energy: Calories (cal)
  • Pressure: Atmosphere (atm), psi

• Metric Prefixes: Utilize metric prefixes for succinct representation of large or small quantities.

Uncertainty in Measurement

• Significant Figures: Important in calculations. Final answers must retain the least number of significant figures from the measured values.

• Multiplication and Division: Result carries the same number of significant figures as the least precise value.

• Multiple Operations: The number of significant figures in the final answer depends on the last operation performed (either addition/subtraction or multiplication/division).

Classification of Matter

• Matter classified as elements, compounds, or mixtures, distinguished by their properties and compositions.
• States of Matter: Identify three states - solid, liquid, gas.
• Properties of Matter: Differentiate between physical properties (observable without changing composition) and chemical properties (observable during a reaction).

Atoms, Molecules, and Ions

• Atoms: Basic unit of matter, not divisible by chemical means.
• Molecules: Two or more atoms bonded together.
• Ions: Charged species formed when atoms or molecules gain or lose electrons.

Naming and Formulas

• Ability to name compounds and write their chemical formulas is crucial in chemistry.
• Calculate atomic, formula, and molecular weights using periodic table data and molecular compositions.