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@openstem · Joined Jul 2026
7420 public items8 groups
Collection5 items
01Chemistry · L1 · Why Salt Melts Icy Roads
02Chemistry · L1 · Why Salt Melts Icy Roads
03Chemistry · L1 · Salt on Icy Roads
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Chemistry · L1 · Why Salt Melts Icy RoadsCollection5 items
01Chemistry · L1 · Secret Messages with Invisible Ink
02Chemistry · L1 · Secret Messages with Invisible Ink
03Chemistry · L1 · Lemon Juice Ink, Step by Step
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Chemistry · L1 · Secret Messages with Invisible InkCollection5 items
01Chemistry · L1 · Why Food Colouring Spreads Through Water
02Chemistry · L1 · Why Food Colouring Spreads Through Water
03Chemistry · L1 · A Drop of Dye Spreading Over Time
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Chemistry · L1 · Why Food Colouring Spreads Through WaterCollection5 items
01Chemistry · L1 · Why Helium Balloons Float Up
02Chemistry · L1 · Why Helium Balloons Float Up
03Chemistry · L1 · Which Way Does a Balloon Go?
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Chemistry · L1 · Why Helium Balloons Float UpCollection4 items
01Chemistry · L1 · Sour or Soapy? Acids and Bases in the Kitchen
02Chemistry · L1 · Sour or Soapy? Acids and Bases in the Kitchen
03Chemistry · L1 · Sour or Soapy Taste Test
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Chemistry · L1 · Sour or Soapy? Acids and Bases in the KitchenCollection4 items
01Chemistry · L1 · Why a Candle Burns
02Chemistry · L1 · Why a Candle Burns
03Chemistry · L1 · The Three Things a Flame Needs
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Chemistry · L1 · Why a Candle BurnsCollection4 items
01Chemistry · L1 · Dissolving vs. Melting
02Chemistry · L1 · Dissolving vs. Melting
03Chemistry · L1 · Melting or Dissolving?
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Chemistry · L1 · Dissolving vs. MeltingCollection4 items
01Chemistry · L1 · Evaporation and Condensation
02Chemistry · L1 · Evaporation and Condensation
03Chemistry · L1 · The Everyday Water Cycle
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Chemistry · L1 · Evaporation and CondensationCollection4 items
01Chemistry · L1 · Why Salt Melts Sidewalk Ice Faster
02Chemistry · L1 · Why Salt Melts Sidewalk Ice Faster
03Chemistry · L1 · Salt on an Icy Sidewalk
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Chemistry · L1 · Why Salt Melts Sidewalk Ice FasterCollection4 items
01Chemistry · L1 · Milk and Vinegar Curdling
02Chemistry · L1 · Milk and Vinegar Curdling
03Chemistry · L1 · Milk Meets Vinegar
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Chemistry · L1 · Milk and Vinegar CurdlingCollection4 items
01Chemistry · L1 · Mixtures vs. Solutions
02Chemistry · L1 · Mixtures vs. Solutions
03Chemistry · L1 · Mixture or Solution?
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Chemistry · L1 · Mixtures vs. SolutionsCollection4 items
01Chemistry · L1 · Oil and Water Don't Mix
02Chemistry · L1 · Oil and Water Don't Mix
03Chemistry · L1 · Shaking Salad Dressing
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Chemistry · L1 · Oil and Water Don't MixCollection4 items
01Chemistry · L1 · Hidden Colors in a Black Marker
02Chemistry · L1 · Hidden Colors in a Black Marker
03Chemistry · L1 · Separating Marker Colors With Water
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Chemistry · L1 · Hidden Colors in a Black MarkerCollection4 items
01Chemistry · L1 · Solid, Liquid, or Gas?
02Chemistry · L1 · Solid, Liquid, or Gas?
03Chemistry · L1 · Heating and Cooling Water
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Chemistry · L1 · Solid, Liquid, or Gas?Collection11 items
01Chemistry · L2 · Atoms and Molecules
02Chemistry · L2 · Physical vs Chemical Change
03Chemistry · L2 · Acids and Bases
+8 moreChemistry · L2 · Atoms, Mixtures & Reactions
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Chemistry · L2 · Atoms, Mixtures & ReactionsCollection6 items
01Chemistry · L2 · Periodic Table Basics
02Chemistry · L2 · Periodic Table Basics
03Chemistry · L2 · Groups of the Periodic Table
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Chemistry · L2 · Periodic Table BasicsCollection7 items
01Chemistry · L2 · The pH Scale
02Chemistry · L2 · pH in Everyday Life
03Chemistry · L2 · The pH Scale
+4 moreChemistry · L2 · Acids, Bases & the pH Scale
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Chemistry · L2 · Acids, Bases & the pH ScaleCollection6 items
01Chemistry · L2 · Chemical Reactions & Word Equations
02Chemistry · L2 · Conservation of Mass
03Chemistry · L2 · Chemical Reactions & Word Equations
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Chemistry · L2 · Chemical Reactions & Word EquationsCollection6 items
01Chemistry · L2 · Separating Mixtures
02Chemistry · L2 · Mixtures and Solutions
03Chemistry · L2 · Separating Mixtures
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Chemistry · L2 · Separating MixturesCollection5 items
01Chemistry · L2 · The Reactivity Series
02Chemistry · L2 · Evidence, Rust, and Uses
03Chemistry · L2 · Metals and Reactivity
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Chemistry · L2 · Metals and ReactivityCollection9 items
01Chemistry · L2 · Chemical Symbols
02Chemistry · L2 · Reading Chemical Formulae
03Chemistry · L2 · Elements, Compounds & Chemical Formulae
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Chemistry · L2 · Elements, Compounds & Chemical FormulaeCollection7 items
01Chemistry · L2 · Solute, Solvent, and Solution
02Chemistry · L2 · Saturation, Temperature, and Concentration
03Chemistry · L2 · Solubility and Solutions
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Chemistry · L2 · Solubility and SolutionsCollection6 items
01Chemistry · L2 · The Fire Triangle
02Chemistry · L2 · Burning Fuels — Products and Extinguishers
03Chemistry · L2 · Combustion and Fuels
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Chemistry · L2 · Combustion and FuelsCollection5 items
01Chemistry · L2 · Density
02Chemistry · L2 · Density
03Chemistry · L2 · Why Objects Float or Sink
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Chemistry · L2 · DensityCollection6 items
01Chemistry · L2 · Crystals — The Basics
02Chemistry · L2 · Growing Crystals
03Chemistry · L2 · Crystals and Crystallization
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Chemistry · L2 · Crystals and CrystallizationCollection6 items
01Chemistry · L2 · Gases in the Air
02Chemistry · L2 · Gases in the Air
03Chemistry · L2 · What's in the Air?
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Chemistry · L2 · Gases in the AirCollection7 items
01Chemistry · L2 · Polymers and Monomers
02Chemistry · L2 · Plastics — Useful but Tricky
03Chemistry · L2 · Polymers and Plastics
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Chemistry · L2 · Polymers and PlasticsCollection6 items
01Chemistry · L2 · Hazard Pictogram Categories
02Chemistry · L2 · Lab Safety Rules
03Chemistry · L2 · Chemical Safety and Hazard Symbols
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Chemistry · L2 · Chemical Safety and Hazard SymbolsCollection6 items
01Chemistry · L2 · Exothermic Reactions
02Chemistry · L2 · Endothermic Reactions & Spotting the Difference
03Chemistry · L2 · Energy in Chemical Reactions
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Chemistry · L2 · Energy in Chemical ReactionsCollection4 items
01Chemistry · L2 · Making Salts
02Chemistry · L2 · Making Salts
03Chemistry · L2 · Naming a Salt from Its Acid
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Chemistry · L2 · Making Salts