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Chemistry: explore STEM content (page 26 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.

Content Groups1

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Flowchart14 objects

Chemistry

Chemistry · L3 · Sodium vs Chlorine — Shells and Groups

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Chemistry · L3 · Sodium vs Chlorine — Shells and Groups

Flashcards10 cards

What is a mole, in everyday terms?1 / 10

A dozen always means 12, however many you're counting. A mole is the same idea for atoms and molecules: it always means 6.02 × 10²³ particles — Avogadro's number — no matter which substance you're counting.

Chemistry

Chemistry · L3 · Stoichiometry & the Mole

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Chemistry · L3 · Stoichiometry & the Mole

Note~741 words · 4 min

Catalysis and green chemistry: lowering barriers, cutting waste A catalyst speeds up a reaction by opening an alternate pathway with a lower activation energy (Ea), without being consumed overall — it may take part in an intermediate step,

Chemistry

Chemistry · L4 · Catalysis and green chemistry: lowering barriers, cutting waste

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Chemistry · L4 · Catalysis and green chemistry: lowering barriers, cutting waste

Quiz5 questions

In a cup of sweet tea, sugar is dissolved in hot water. What is the sugar called?

AThe solventBThe soluteCThe solutionDThe mixture

Chemistry

Chemistry · L2 · Solubility and Solutions

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Chemistry · L2 · Solubility and Solutions

Flowchart11 objects

Chemistry

Chemistry · L2 · Energy in Chemical Reactions · flowchart

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Chemistry · L2 · Energy in Chemical Reactions · flowchart

Collection5 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

Chemistry · L1 · Secret Messages with Invisible Ink

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Chemistry · L1 · Secret Messages with Invisible Ink

Flowchart5 objects

Chemistry

Chemistry · L1 · Separating Marker Colors With Water

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Chemistry · L1 · Separating Marker Colors With Water

Flowchart13 objects

Chemistry

Chemistry · L4 · Cell Notation and Concentration Cells · flowchart

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Chemistry · L4 · Cell Notation and Concentration Cells · flowchart

Flowchart21 objects

Chemistry

Chemistry · L3 · VSEPR shapes — worked examples

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Chemistry · L3 · VSEPR shapes — worked examples

Quiz6 questions

What is the total electron count of Fe(CO)5 by the 18-electron rule?

A16B17C18D20

Chemistry

Chemistry · L5 · Organometallic Chemistry & Catalytic Cycles

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Chemistry · L5 · Organometallic Chemistry & Catalytic Cycles

Quiz6 questions

Why does 2D NMR spectroscopy become necessary for larger, more complex molecules?

A1D spectra lose signal intensity for larger moleculesB1D spectra become too crowded and overlapping to assign individual signals reliablyC1D NMR cannot detect ¹³C nuclei at allD2D NMR always requires less instrument time than 1D NMR

Chemistry

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

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

Flashcards8 cards

What does the mnemonic OIL RIG stand for?1 / 8

OIL — Oxidation Is Loss (of electrons). RIG — Reduction Is Gain (of electrons). It's a quick way to remember which direction each half-process moves electrons.

Chemistry

Chemistry · L3 · Redox & Electrochemistry

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Chemistry · L3 · Redox & Electrochemistry

Collection6 items

01Chemistry · L4 · Freezing Point Depression & Boiling Point Elevation

02Chemistry · L4 · Raoult's Law & Osmotic Pressure

03Chemistry · L4 · Colligative Properties (Quantitative)

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Chemistry

Chemistry · L4 · Colligative Properties

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Chemistry · L4 · Colligative Properties

Flowchart15 objects

Chemistry

Chemistry · L4 · Gibbs free energy: the four cases, the crossover point, and the road to K · flowchart

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Chemistry · L4 · Gibbs free energy: the four cases, the crossover point, and the road to K · flowchart

Note~437 words · 2 min

A titration that isn't about pH at all An acid–base titration tracks proton transfer, and its endpoint is flagged by a pH indicator. A REDOX titration swaps both of those out: the titrant and analyte react by transferring electrons, not pro

Chemistry

Chemistry · L3 · Redox Titrations

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Chemistry · L3 · Redox Titrations

Note~1271 words · 6 min

Glass transition, crystallinity, and the chain-structure–property connection L4 classified polymers along one axis: how heavily are the chains cross-linked (thermoplastic vs elastomer vs thermoset)? This note works within the thermoplastics

Chemistry

Chemistry · L5 · Glass Transition, Crystallinity & Chain-Structure–Property Control

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Chemistry · L5 · Glass Transition, Crystallinity & Chain-Structure–Property Control

Flowchart17 objects

Chemistry

Chemistry · L2 · Alloys — Mixing Metals for a Purpose · flowchart

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Chemistry · L2 · Alloys — Mixing Metals for a Purpose · flowchart

Flashcards7 cards

What is the 'rocking-chair' mechanism of a lithium-ion battery?1 / 7

In a rocking-chair (intercalation-type) lithium-ion battery, Li⁺ ions shuttle back and forth between two host intercalation materials — a graphite anode and a transition-metal oxide cathode — inserting into and extracting from the layered or channeled crystal structure of each electrode without either host structure being consumed or fundamentally transformed. Charging drives Li⁺ out of the cathode host and into the graphite anode host; discharging reverses the flow — the electrode HOSTS never change identity, only their lithium occupancy, which is why the mechanism is called 'rocking-chair' rather than a conversion or plating reaction.

Chemistry

Chemistry · L5 · Battery Chemistry & Materials

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Chemistry · L5 · Battery Chemistry & Materials

Flowchart13 objects

Chemistry

Chemistry · L2 · Alloys — Two Copper Alloys

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Chemistry · L2 · Alloys — Two Copper Alloys

Quiz5 questions

Why do people sprinkle salt on icy sidewalks?

ASalt makes the ice colder instantlyBSalt lowers the temperature the ice needs to refreeze at, so it melts and stays meltedCSalt turns the ice into a new substanceDSalt has nothing to do with the ice

Chemistry

Chemistry · L1 · Why Salt Melts Sidewalk Ice Faster

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Chemistry · L1 · Why Salt Melts Sidewalk Ice Faster

Note~290 words · 1 min

Polymers and Plastics A polymer is a very long chain made of many small, repeating units called monomers, joined together end to end. Picture a paper-clip chain made of thousands of identical clips — each clip is a monomer, and the whole ch

Chemistry

Chemistry · L2 · Polymers and Plastics

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Chemistry · L2 · Polymers and Plastics

Note~1000 words · 5 min

Marcus Theory: Why and How Fast Electron Transfer Happens L4's electrochemistry note covered how far a redox reaction wants to go — E°cell and ΔG° = −nFE°cell tell you whether electrons will flow and how much useful work they can do. Marcus

Chemistry

Chemistry · L5 · Marcus Theory: Why and How Fast Electron Transfer Happens

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Chemistry · L5 · Marcus Theory: Why and How Fast Electron Transfer Happens

Quiz6 questions

In a blast furnace, what is the actual chemical species that reduces iron(III) oxide to iron?

ACarbon monoxide (CO), formed when carbon dioxide reacts with more cokeBCarbon dioxide (CO2) itselfCSolid coke, reacting directly with the solid oreDCalcium oxide (CaO)

Chemistry

Chemistry · L4 · Blast Furnace and Electrolytic Refining

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Chemistry · L4 · Blast Furnace and Electrolytic Refining

Collection4 items

01Chemistry · L2 · Natural and Synthetic Fibers

02Chemistry · L2 · Natural and Synthetic Fibers

03Chemistry · L2 · From Fiber to Fabric Choice

+1 more

Chemistry

Chemistry · L2 · Natural and Synthetic Fibers

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Chemistry · L2 · Natural and Synthetic Fibers

Plot1 plot

Chemistry

Chemistry · L5 · Fuel Cell Polarization Curve

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Chemistry · L5 · Fuel Cell Polarization Curve

Flowchart8 objects

Chemistry

Chemistry · L4 · The Steady-State Approximation · flowchart

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Chemistry · L4 · The Steady-State Approximation · flowchart

Quiz5 questions

Which technique would you use to separate sand from water?

AFiltrationBEvaporationCDistillationDChromatography

Chemistry

Chemistry · L2 · Separating Mixtures

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Chemistry · L2 · Separating Mixtures

Flashcards8 cards

What is a polymer?1 / 8

A polymer is a very long chain made of many small, repeating units called monomers joined together — like a paper-clip chain made of thousands of identical clips.

Chemistry

Chemistry · L2 · Polymers and Monomers

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Chemistry · L2 · Polymers and Monomers

Flowchart12 objects

Chemistry

Chemistry · L3 · Inside a Galvanic (Voltaic) Cell

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Chemistry · L3 · Inside a Galvanic (Voltaic) Cell

Flowchart9 objects

Chemistry

Chemistry · L3 · Bucket Brigade Analogy for the Rate-Determining Step

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Chemistry · L3 · Bucket Brigade Analogy for the Rate-Determining Step

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