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Chemistry: explore STEM content (page 12 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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Flowchart9 objects

Chemistry

Chemistry · L4 · Thermoplastic vs Thermoset vs Elastomer

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Chemistry · L4 · Thermoplastic vs Thermoset vs Elastomer

Flowchart6 objects

Chemistry

Chemistry · L1 · Bike Left Out vs Bike Kept Dry

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Chemistry · L1 · Bike Left Out vs Bike Kept Dry

Collection5 items

01Chemistry · L5 · Green Chemistry — Sustainable Catalysis

02Chemistry · L5 · Green Chemistry — Sustainable Catalysis: the E-factor, asymmetric catalysis, and green solvents

03Chemistry · L5 · Catalytic asymmetric synthesis vs racemic resolution

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Chemistry

Chemistry · L5 · Green Chemistry — Sustainable Catalysis

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Chemistry · L5 · Green Chemistry — Sustainable Catalysis

Flowchart7 objects

Chemistry

Chemistry · L3 · Avogadro's Law and Molar Gas Volume · flowchart

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Chemistry · L3 · Avogadro's Law and Molar Gas Volume · flowchart

MoleculeReaction: CBr.[OH-]>>CO.[Br-]

Chemistry

Chemistry · L3 · Sₙ2 substitution

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Chemistry · L3 · Sₙ2 substitution

Flowchart10 objects

Chemistry

Chemistry · L5 · Wilkinson's Catalyst: A Homogeneous Hydrogenation Cycle

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Chemistry · L5 · Wilkinson's Catalyst: A Homogeneous Hydrogenation Cycle

Flowchart13 objects

Chemistry

Chemistry · L2 · Getting Metals from Ores · flowchart

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Chemistry · L2 · Getting Metals from Ores · flowchart

Collection6 items

01Chemistry · L1 · Food Mixtures

02Chemistry · L1 · Blending, Painting, and Dressing

03Chemistry · L1 · Mixing in the Kitchen

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Chemistry

Chemistry · L1 · Mixing in the Kitchen

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Chemistry · L1 · Mixing in the Kitchen

MoleculeCCO

Chemistry

Ethanol (CH₃CH₂OH)

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Ethanol (CH₃CH₂OH)

Flowchart15 objects

Chemistry

Chemistry · L4 · Ranking boiling points: combining size and IMF type

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Chemistry · L4 · Ranking boiling points: combining size and IMF type

Quiz6 questions

Why does each successive dissociation constant of a polyprotic acid (Ka1, Ka2, Ka3, …) get progressively smaller?

ARemoving a proton becomes progressively harder because the species losing it is progressively more negatively charged, so it holds the remaining protons more tightlyBLater protons are chemically different atoms with weaker O–H bondsCThe solution becomes more dilute after each dissociation stepDEquilibrium constants always decrease with each reaction step, regardless of the species involved

Chemistry

Chemistry · L4 · Polyprotic Acids — 6 Q

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Chemistry · L4 · Polyprotic Acids — 6 Q

Flashcards8 cards

Why can carbon form so many more compounds than almost any other element?1 / 8

Carbon forms four covalent bonds, and — unusually — it bonds happily to itself, chaining into long strings, branches, and rings almost without limit. That single property (catenation) is why organic chemistry, the chemistry of carbon compounds, is such a vast field.

Chemistry

Chemistry · L3 · Organic Chemistry: Functional Groups & Naming

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Chemistry · L3 · Organic Chemistry: Functional Groups & Naming

Quiz5 questions

A Schottky defect in an ionic crystal consists of what?

AA single cation vacancy, with no accompanying anion vacancyBA matched pair of vacancies — one cation site and one anion site both left emptyCA cation displaced into an interstitial site, leaving a vacancy behindDAn extra ion squeezed into an interstitial gap with no vacancy created

Chemistry

Chemistry · L5 · Crystal Defects and Semiconductors

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Chemistry · L5 · Crystal Defects and Semiconductors

Quiz5 questions

What best describes a system at dynamic equilibrium?

AThe forward and reverse reaction rates are equalBThe forward reaction has stopped completelyCThe amounts of reactant and product are equalDThe reverse reaction has stopped completely

Chemistry

Chemistry · L3 · Chemical Equilibrium & Le Chatelier's Principle — 5 Q

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Chemistry · L3 · Chemical Equilibrium & Le Chatelier's Principle — 5 Q

Flowchart19 objects

Chemistry

Chemistry · L5 · Schottky vs Frenkel Defect Formation

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Chemistry · L5 · Schottky vs Frenkel Defect Formation

Flowchart13 objects

Chemistry

Chemistry · L5 · Free-Energy Perturbation Alchemical Pathway

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Chemistry · L5 · Free-Energy Perturbation Alchemical Pathway

Quiz6 questions

HBr adds to 2-methylpropene, (CH₃)₂C=CH₂. What is the major product, and why?

Atert-Butyl bromide, via the more stable tertiary carbocationBIsobutyl bromide, via the more stable primary carbocationCtert-Butyl bromide, via a radical chain mechanismDAn equal mixture of both regioisomers

Chemistry

Chemistry · L4 · Addition and Elimination Mechanisms Quiz

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Chemistry · L4 · Addition and Elimination Mechanisms Quiz

Note~848 words · 4 min

Cell notation and concentration cells The earlier note on electrochemistry built up E°cell, ΔG° = −nFE°, and the Nernst equation from two half-reactions described in words. This note adds two things on top of that foundation: a compact, sta

Chemistry

Chemistry · L4 · Cell Notation and Concentration Cells

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Chemistry · L4 · Cell Notation and Concentration Cells

Flashcards7 cards

What is the law of conservation of mass?1 / 7

In a chemical reaction, no atoms are created or destroyed — they are only rearranged into new substances. So the total mass of the products equals the total mass of the reactants.

Chemistry

Chemistry · L2 · Conservation of Mass

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Chemistry · L2 · Conservation of Mass

Flowchart16 objects

Chemistry

Chemistry · L4 · E1 vs E2: reading the pathway from substrate, base, and solvent

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Chemistry · L4 · E1 vs E2: reading the pathway from substrate, base, and solvent

Flashcards8 cards

What are the four main classes of crystalline solid, classified by what holds their particles together?1 / 8

Ionic (electrostatic attraction between ions), molecular (weak intermolecular forces between discrete molecules), covalent network (one giant, continuously covalently-bonded lattice), and metallic (a delocalized 'sea' of electrons shared among metal cations).

Chemistry

Chemistry · L4 · Solid State Chemistry — Crystal Classes & Bonding

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Chemistry · L4 · Solid State Chemistry — Crystal Classes & Bonding

Quiz5 questions

Which particle is emitted during alpha decay?

AElectronBHelium nucleus (2 protons + 2 neutrons)CGamma ray photonDA single neutron

Chemistry

Chemistry · L3 · Nuclear Chemistry — 5 Q

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Chemistry · L3 · Nuclear Chemistry — 5 Q

Flowchart15 objects

Chemistry

Chemistry · L3 · Identifying Cations with Sodium Hydroxide

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Chemistry · L3 · Identifying Cations with Sodium Hydroxide

Quiz5 questions

What is the fundamental advantage single-molecule spectroscopy has over ensemble spectroscopy?

AIt always gives a stronger overall signalBIt reveals the underlying distribution of behaviors and real-time dynamics that an ensemble average washes outCIt eliminates the need for any fluorescent labelDIt can only be performed on solid samples

Chemistry

Chemistry · L5 · Single-Molecule Spectroscopy

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Chemistry · L5 · Single-Molecule Spectroscopy

Flowchart9 objects

Chemistry

Chemistry · L2 · Temperature and Dissolving

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Chemistry · L2 · Temperature and Dissolving

Quiz6 questions

Dipole moment is a vector quantity. What two things does that mean it has?

AOnly a magnitude, measured in debyeBA magnitude AND a directionCOnly a direction, from negative to positiveDA magnitude and a sign (positive or negative), but no direction

Chemistry

Chemistry · L4 · Intermolecular Forces & Molecular Polarity — 6 Q

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Chemistry · L4 · Intermolecular Forces & Molecular Polarity — 6 Q

Collection5 items

01Chemistry · L1 · Why Bread and Cakes Rise

02Chemistry · L1 · Why Bread and Cakes Rise

03Chemistry · L1 · How Bread Dough Rises

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Chemistry

Chemistry · L1 · Why Bread and Cakes Rise

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Chemistry · L1 · Why Bread and Cakes Rise

Flowchart9 objects

Chemistry

Chemistry · L2 · Polymers and Plastics · flowchart

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Chemistry · L2 · Polymers and Plastics · flowchart

Flashcards10 cards

Is a black marker really made of just one plain color?1 / 10

No — a black marker is often a mix of several hidden colors that only look black together.

Chemistry

Chemistry · L1 · Hidden Colors in a Black Marker

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Chemistry · L1 · Hidden Colors in a Black Marker

Quiz6 questions

Identify the substituent on the ring below, and predict where a second electrophile would attack.

AAn amino group — activating, so the ring is attacked at the ortho and para positionsBA nitro group — deactivating, so the ring is attacked at the meta positionCA nitro group — activating, so the ring is attacked at the ortho and para positionsDA hydroxyl group — deactivating, so the ring is attacked at the meta position

Chemistry

Chemistry · L4 · Reading Structures, Schemes & Calibration Curves — 6 Q

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Chemistry · L4 · Reading Structures, Schemes & Calibration Curves — 6 Q

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