Six - Seven 😵
Sugar dissolves faster in hot water than in cold water.
Explain why this happens using particle motion and kinetic energy
Sugar dissolves faster in hot water because higher temperature gives water molecules more kinetic energy, leading to more frequent and energetic collisions that break solute–solute attractions more quickly.
transition from solid to gas
why is evaporation a reversible change
b/c condensation returns the form of water vapor to water
Most solids become more soluble as temperature increases, but gases become less soluble.
Explain why these trends are opposite, using particle motion and escape tendencies.
Solids dissolve better at higher temperatures because increased particle motion helps separate solute particles, while gases dissolve less because extra kinetic energy makes gas particles escape the liquid instead of staying dissolved.
Describe in detail what happens to solute and solvent particles when a solid dissolves in a liquid.
When a solid dissolves, solute particles break away from each other, solvent particles surround them and form new attractions, and the solute becomes evenly dispersed among moving solvent particles.
is condensation exo or endothermic
exothermic
what are the reversible changes
melting and freezing
condensation and evaporation
deposition and sublimation
what is dissolving
physical change that occurs when particles settle in a substance
explain why dissolving salt in water is considered a reversible physical change.
Dissolving salt is a physical, reversible change because the Na⁺ and Cl⁻ ions simply separate and spread out among water molecules without forming any new substances, and removing the water allows the ions to re-combine into the original salt.
what is melting
transition between solid and liquid