Unit One: Chemical Reactions. Lesson two: the speed of chemical reactions.Keywords (English): concentration – reaction rate – reactants – collision frequency

Unit One: Chemical Reactions. Lesson two: the speed of chemical reactions.Keywords (English): surface area – reaction rate – reactants – collisions

Unit One: Chemical Reactions. Lesson two: the speed of chemical reactions.Keywords (English): temperature – reaction rate – energy – collisions – chemistry

Unit One: Chemical Reactions. Lesson two: the speed of chemical reactions.Keywords (English): enzymes – reaction rate – catalysts – biochemistry

Keywords: Periodic table – Elements – Groups – Periods – Classification

Keywords: Light – Plants – Photosynthesis – Growth – Energy

Keywords: Water transport – Plant – Roots – Vessels – Transpiration

The goal of the experiment:Explain the difference between materials in terms of densityTools:Copper wire - piece of gold - platinum ingot - ice cubes - piece of coal - cork - paper - piece of wood - ruler - screwSteps:Put the materials in front of you in the tub and control the liquid density from t......

Keywords: Photosynthesis – Light intensity – Plants – Oxygen – Chlorophyll