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Chemistry: explore STEM content (page 32 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

What kind of reaction is shown?

ANucleophilic substitutionBElectrophilic additionCFree-radical chain reactionDAcid–base neutralisation

Chemistry

Chemistry · L3 · Reactions and Structures — 5 Q

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Chemistry · L3 · Reactions and Structures — 5 Q

Collection5 items

01Chemistry · L1 · Natural and Human-made Materials

02Chemistry · L1 · Where Do Materials Come From?

03Chemistry · L1 · Natural or Human-made?

+2 more

Chemistry

Chemistry · L1 · Natural and Human-made Materials

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Chemistry · L1 · Natural and Human-made Materials

Flowchart11 objects

Chemistry

Chemistry · L2 · The Chemistry of Food Preservation · flowchart

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Chemistry · L2 · The Chemistry of Food Preservation · flowchart

Quiz6 questions

Which three metals commonly act as catalysts in a car's catalytic converter?

APlatinum, palladium and rhodiumBIron, nickel and copperCVanadium, manganese and chromiumDGold, silver and zinc

Chemistry

Chemistry · L3 · Catalysts in Industry — 6 Q

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Chemistry · L3 · Catalysts in Industry — 6 Q

Flowchart6 objects

Chemistry

Chemistry · L4 · Why Cross-Linking Locks Chains in Place

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Chemistry · L4 · Why Cross-Linking Locks Chains in Place

Flowchart13 objects

Chemistry

Chemistry · L5 · Crystal Defects and Semiconductors · flowchart

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Chemistry · L5 · Crystal Defects and Semiconductors · flowchart

Flashcards10 cards

Do oil and water mix together?1 / 10

No. Oil and water do not mix, no matter how long you stir them.

Chemistry

Chemistry · L1 · Oil and Water Don't Mix

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Chemistry · L1 · Oil and Water Don't Mix

Note~628 words · 3 min

Catalysts in industry: a gallery beyond Haber and Contact You've already seen iron and vanadium(V) oxide as industrial catalysts — iron in the Haber process, vanadium(V) oxide in the Contact process. A catalyst still means the same thing ev

Chemistry

Chemistry · L3 · Catalysts in Industry

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Chemistry · L3 · Catalysts in Industry

Flashcards10 cards

What is a back titration (indirect titration), and why use one instead of titrating the analyte directly?1 / 10

A back titration adds a KNOWN, precisely measured EXCESS of a standard reagent to the sample — enough to react completely with the analyte — then titrates the LEFTOVER (unreacted) excess with a second standard solution. It's used when the analyte can't be titrated directly: e.g. it's an insoluble solid, it reacts too slowly with a titrant to give a stable endpoint, or no indicator gives a sharp colour change for the direct reaction.

Chemistry

Chemistry · L4 · Back Titration

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Chemistry · L4 · Back Titration

Collection4 items

01Chemistry · L2 · Testing for Gases

02Chemistry · L2 · Testing for Gases

03Chemistry · L2 · The Four Gas Tests, Grouped

+1 more

Chemistry

Chemistry · L2 · Testing for Gases

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Chemistry · L2 · Testing for Gases

MoleculeOCC1OC(O)C(O)C(O)C1O

Chemistry

Chemistry · L3 · Glucose

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Chemistry · L3 · Glucose

Note~561 words · 3 min

Chirality Without a Stereocenter Ordinary (point) chirality requires a stereocenter: an atom bonded to four different substituents arranged tetrahedrally, whose mirror image cannot be superimposed on the original. Atropisomerism produces ch

Chemistry

Chemistry · L5 · Atropisomerism and Axial Chirality

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Chemistry · L5 · Atropisomerism and Axial Chirality

Flowchart19 objects

Chemistry

Chemistry · L5 · Zeolite Catalysis · flowchart

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Chemistry · L5 · Zeolite Catalysis · flowchart

Flashcards10 cards

According to kinetic molecular theory, what is true about the AVERAGE kinetic energy of different gases at the same temperature?1 / 10

All gases at the same temperature have the same average translational kinetic energy, regardless of their identity or molar mass: KE_avg = (3/2)RT, which depends only on T. Since KE = ½mv², a heavier molecule (larger m) must have a proportionally smaller average v² to keep KE the same as a lighter molecule's — heavier molecules simply move slower, on average, at a given temperature.

Chemistry

Chemistry · L4 · Effusion, Diffusion & Graham's Law

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Chemistry · L4 · Effusion, Diffusion & Graham's Law

Quiz6 questions

Which pair of oxidation states does iron most commonly show in its compounds?

AFe⁺ and Fe²⁺BFe²⁺ and Fe³⁺CFe³⁺ and Fe⁴⁺DFe and Fe⁺

Chemistry

Chemistry · L3 · Transition Metals — Variable States and Color — 6 Q

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Chemistry · L3 · Transition Metals — Variable States and Color — 6 Q

Note~462 words · 2 min

Chemistry Without a Solvent: Mechanical Activation Most synthetic organic chemistry dissolves reactants in a solvent so that molecules can diffuse together and react homogeneously. Mechanochemistry instead brings solid reactants into intima

Chemistry

Chemistry · L5 · Mechanochemistry

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Chemistry · L5 · Mechanochemistry

Note~672 words · 3 min

Organic synthesis routes: retrosynthetic analysis and a worked example Planning a multi-step organic synthesis rarely starts by asking 'what does this starting material turn into?' — it starts at the TARGET and works backwards. Retrosynthet

Chemistry

Chemistry · L4 · Retrosynthetic analysis and a worked multi-step synthesis

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Chemistry · L4 · Retrosynthetic analysis and a worked multi-step synthesis

Flowchart13 objects

Chemistry

Chemistry · L1 · Sorting and Recycling Materials · flowchart

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Chemistry · L1 · Sorting and Recycling Materials · flowchart

Flowchart7 objects

Chemistry

Chemistry · L3 · Finding Molarity

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Chemistry · L3 · Finding Molarity

Note~673 words · 3 min

Why Two Dimensions? A 1D ¹H spectrum plots intensity against a single chemical-shift axis. For a small molecule that is plenty — but for a molecule with many chemically similar protons, peaks pile up and overlap until individual multiplets

Chemistry

Chemistry · L5 · Advanced NMR: 2D Techniques & Coupling Analysis

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Chemistry · L5 · Advanced NMR: 2D Techniques & Coupling Analysis

Flowchart13 objects

Chemistry

Chemistry · L3 · Addition vs Condensation Polymerization

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Chemistry · L3 · Addition vs Condensation Polymerization

Quiz6 questions

What does electronegativity describe?

AAn atom's tendency to pull the electrons it shares in a bond toward itselfBThe number of valence electrons an atom hasCAn atom's atomic massDThe number of bonds an atom can form

Chemistry

Chemistry · L3 · Electronegativity and Bond Polarity — 6 Q

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Chemistry · L3 · Electronegativity and Bond Polarity — 6 Q

Note~539 words · 3 min

Coordination complexes: ligands, naming, and why they're colored A coordination complex has a central transition metal ion surrounded by ligands — molecules or ions that each donate a lone electron pair to the metal, forming a coordinate (d

Chemistry