Conservation of mass

• What does the Conservation of Mass state?

  The total mass does not change
• What happens to particles during a change of state?

  Particles move faster or slower and rearrange
• Does the number of particles change during a change of state?

  No, the number of particles stays the same
• Why does the mass remain the same when particles change state?

  Because particles only move differently, not change
• If you rearrange blocks on a balance, what happens to the mass?

  The mass does not change
• What is the mass of ice and liquid water if each particle is 1kg and there are 15 particles?

  Both have a mass of 15kg
• What is true for all changes of state regarding mass?

  The mass is conserved
• What happens to atoms during a chemical reaction?

  Atoms rearrange and join in different ways
• What remains the same in a chemical reaction regarding atoms?

  The total number of each type of atom
• Why does mass stay the same in a chemical reaction?

  Atoms cannot be created or destroyed
• What are the key concepts of the Conservation of Mass?

  • Total mass remains constant in reactions
  • Number of particles does not change
  • Atoms are rearranged, not created or destroyed
• What are greenhouse gases?

  Gases that trap heat in the atmosphere
• How do greenhouse gases contribute to climate change?

  They increase Earth's temperature by trapping heat
• What is recycling?

  Process of converting waste into reusable material
• Why are ceramics important in materials science?

  They are durable and heat-resistant materials
• What are polymers?

  Large molecules made of repeating units
• What are composites?

  Materials made from two or more different substances
• What is the reactivity series?

  A list of metals arranged by reactivity
• What is ionic bonding?

  Transfer of electrons between atoms to form ions
• What are state symbols in chemistry?

  Symbols indicating the physical state of substances
• What is the purpose of balancing chemical equations?

  To ensure the conservation of mass in reactions
• How do you calculate relative formula mass?

  Add the atomic masses of all atoms in a formula
• What is a displacement reaction?

  A reaction where one element replaces another in a compound
• What are halogens?

  Group of elements known for their reactivity
• What is the significance of metal alloys?

  They enhance properties like strength and corrosion resistance
• What is the purpose of measuring gas production in reactions?

  To determine the rate of a chemical reaction
• What factors affect the rate of reaction?

  Concentration, temperature, surface area, and catalysts
• What is a catalyst?

  A substance that speeds up a chemical reaction
• How do you test for oxygen?

  Using a glowing splint that reignites in oxygen
• What are the energy changes during reactions?

  Energy is absorbed or released during reactions
• What is density?

  Mass per unit volume of a substance
• What is the equation for density?

  Density = mass / volume
• What are the states of matter?

  Solid, liquid, gas, and plasma
• What is the significance of measuring temperature in gases?

  It indicates the average kinetic energy of particles
• What is conservation of mass?

  Mass is neither created nor destroyed in reactions
• What are pure substances?

  Materials made of only one type of particle
• What is the importance of understanding particles in chemistry?

  It helps explain the behavior of matter
• What are the key concepts in the study of materials?

  • Greenhouse gases and climate change
  • Recycling and its importance
  • Properties of ceramics, polymers, and composites
  • Reactivity series and ionic bonding
  • Balancing chemical equations and relative formula mass
  • Factors affecting reaction rates and catalysts
  • Density and its calculation
• What are the main topics covered in the chemistry section?

  1. Particles and states of matter
  2. Chemical reactions and equations
  3. Energy changes in reactions
  4. Properties of materials
  5. Environmental impact of materials
• What are the applications of science and its implications?

  • Development of scientific knowledge through technology
  • Development of technology through scientific research
  • Ethical, social, economic, and political implications of science