Questions about the physical changes Whiteboard exercise Play

Reaction conditions and enthalpy change Slideshow Play

Reaction of the brain to environmental changes Slideshow Play

Reaction series for the changes undergone by ethanol in the human organism Whiteboard exercise Play

Reactions involving phase changes Animation Play

Recent changes in the Earth's temperature Slideshow Play

Recombination in bacteria Animation Play

Relation between enthalpy of solution and enthalpy of hydration Whiteboard exercise Play

Resonance energy for benzene Animation Play

Responses of the autonomic nervous system to changes in the external environment Student activity Play

Responses to changes in ambient temperature Whiteboard exercise Play

Seasonal changes Student activity Play

Seasonal changes Whiteboard exercise Play

Sodium chloride formation Animation Play

Sodium hydroxide Animation Play

Solubility Animation Play

Speed changes Animation Play

Spontaneous changes Animation Play

Spontaneous changes and probability Whiteboard exercise Play

Spontaneous changes and probability Student activity Play

Standard enthalpies of combustion for selected substances Chart Play

Standard enthalpies of formation for elements Chart Play

Standard enthalpy change Student activity Play

Standard enthalpy change Animation Play

Standard enthalpy change Whiteboard exercise Play