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Chemistry: explore STEM content (page 23 of 47) · openstem

All fields Software Mathematics Physics Chemistry Biology Engineering Astronomy Environmental Other Chemistry Chemistry groups

Explore STEM Content

Search the community's STEM library — free to study, yours to make your own.

Chemistry

Reactions, bonding and organic chemistry on openstem — flashcards, notes, quizzes and molecule structures shared by the community. Study free, or clone into your library.

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Quiz5 questions

Why does MLCT excitation make a photocatalyst both a stronger oxidant and a stronger reductant simultaneously?

AIt increases the total electron count on the metalBThe metal-centered electron hole created makes it a better oxidant, while the promoted ligand pi* electron makes it a better reductantCExcitation always favors oxidation only, never reductionDThe metal center is reduced to a lower oxidation state upon excitation

Chemistry

Chemistry · L5 · Photoredox Catalysis

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Chemistry · L5 · Photoredox Catalysis

Flowchart14 objects

Chemistry

Chemistry · L3 · Reaching dynamic equilibrium

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Chemistry · L3 · Reaching dynamic equilibrium

Flashcards7 cards

What happens when you blend fruit into a smoothie?1 / 7

The fruit gets mashed up smooth. It looks different, but it is still just mixed-up fruit.

Chemistry

Chemistry · L1 · Blending, Painting, and Dressing

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Chemistry · L1 · Blending, Painting, and Dressing

Collection6 items

01Chemistry · L2 · Hazard Pictogram Categories

02Chemistry · L2 · Lab Safety Rules

03Chemistry · L2 · Chemical Safety and Hazard Symbols

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Chemistry

Chemistry · L2 · Chemical Safety and Hazard Symbols

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Chemistry · L2 · Chemical Safety and Hazard Symbols

Flashcards8 cards

What two conditions does collision theory say a collision must meet to cause a reaction?1 / 8

The particles must collide with enough energy — at least the activation energy — AND in the correct orientation. Meet only one and the collision fails.

Chemistry

Chemistry · L3 · Reaction rates & kinetics

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Chemistry · L3 · Reaction rates & kinetics

Flashcards12 cards

What is a reaction intermediate, and why can't its concentration be handled with simple algebra the way a stable reactant can?1 / 12

An intermediate is a species produced by one elementary step and consumed by a later one — it never appears in the overall equation. Because it is typically short-lived and reactive, we can't just measure its concentration directly; we need an approximation to eliminate it from the rate law.

Chemistry

Chemistry · L4 · The Steady-State Approximation

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Chemistry · L4 · The Steady-State Approximation

Flowchart13 objects

Chemistry

Chemistry · L2 · The pH Scale, 0 to 14

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Chemistry · L2 · The pH Scale, 0 to 14

Flowchart13 objects

Chemistry

Chemistry · L2 · Physical vs Chemical Change

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Chemistry · L2 · Physical vs Chemical Change

Quiz5 questions

Why does a singlet carbene's cyclopropanation of an alkene proceed stereospecifically?

AIt reacts in a single concerted step with no intermediate that could rotate and scramble the alkene's original stereochemistryBSinglet carbenes never react with alkenes at allCSinglet carbenes always racemize the alkene before additionDSinglet carbenes only add to alkenes at very low temperature

Chemistry

Chemistry · L5 · Carbene Chemistry

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Chemistry · L5 · Carbene Chemistry

MoleculeO

Chemistry

Chemistry · L2 · Water (H₂O)

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Chemistry · L2 · Water (H₂O)

Note~996 words · 5 min

Solid state chemistry: crystal classes and unit cells Most solids we handle are crystalline: their particles pack into an ordered, repeating three-dimensional pattern rather than sitting in random disorder. What holds a particular solid tog

Chemistry

Chemistry · L4 · Solid state chemistry: crystal classes and unit cells

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Chemistry · L4 · Solid state chemistry: crystal classes and unit cells

Flowchart7 objects

Chemistry

Chemistry · L1 · Testing with Magnets · flowchart

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Chemistry · L1 · Testing with Magnets · flowchart

Flowchart13 objects

Chemistry

Chemistry · L5 · Photoredox Catalysis · flowchart

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Chemistry · L5 · Photoredox Catalysis · flowchart

Flowchart10 objects

Chemistry

Chemistry · L1 · After You Use a Garden Tool

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Chemistry · L1 · After You Use a Garden Tool

Flowchart15 objects

Chemistry

Chemistry · L5 · Spectrochemical Series — Weak-Field to Strong-Field Ligands

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Chemistry · L5 · Spectrochemical Series — Weak-Field to Strong-Field Ligands

Flashcards11 cards

Why do candle wax, propane, and petrol all produce carbon dioxide and water when they burn completely?1 / 11

They are all hydrocarbons — molecules made only of carbon and hydrogen. When any hydrocarbon burns completely in plenty of oxygen, its carbon always ends up as carbon dioxide and its hydrogen as water.

Chemistry

Chemistry · L2 · What Comes Out of a Flame

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Chemistry · L2 · What Comes Out of a Flame

Note~614 words · 3 min

Measuring Activity, Not Just Abundance Most proteomic methods measure how much of a protein is present. Activity-based protein profiling (ABPP) instead measures whether an enzyme is catalytically FUNCTIONING, using a small-molecule probe de

Chemistry