Keywords: Calories – Food – Energy – Combustion – Heat

Keywords: Specific heat – Thermal energy – Mass – Temperature

Keywords: Cold materials – Heat transfer – Absorption – Temperature

Keywords: Equilibrium – Forces – Motion – Position – Physics

Do some light bulbs waste less energy than others?Keywords (English): light bulbs – energy efficiency – electricity consumption – lighting – comparison

Keywords: Soil – Plant growth – Silt – Sand – Clay – Humus

Comparing evaporation ratesKeywords (English): evaporation – evaporation rate – temperature – surface area – type of liquid

Tornado vortex inside a bottletornado – vortex – air pressure – water rotation – weather phenomena

Keywords: Star brightness – Distance – Light – Astronomy – Luminosity – Stars

Keywords: Conservation of mass – Chemical reaction – Change – Reactants – Products

Keywords: Atomic mass – Protons – Neutrons – Atom – Mass number

Keywords: Pigment separation – Chromatography – Colors – Paper – Analysis

Keywords: Force – Motion – Acceleration – Mass – Newton

Keywords: Alcohols – Functional groups – Combustion – Solubility – Bonds

Keywords: Air masses – Fronts – Temperature – Weather – Winds

Keywords: Unequal heating – Solar radiation – Winds – Atmospheric pressure

Keywords: Nitrogen gas – Preparation – Reaction – Products – Laboratory

Keywords: Nitrogen – Salts – Chemical reaction – Analysis

Keywords: Nitrogen gas – Preparation – Reaction – Products – Laboratory

Keywords: Energy – Transformation – Heat – Motion – Light

Keywords: Ammonia gas – Ammonia – Preparation apparatus – Odors – Bases

Keywords: Observation – Conclusion – Senses – Data – Scientific evidence

Keywords: Energy conversion – Motion – Electricity – Light – Heat

Keywords: Photoelectric effect – Electrons – Light – Emission