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Chemistry: explore STEM content (page 33 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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Quiz6 questions

Which carbon in this molecule is the chiral centre?

AC1BC2CC3DC4

Chemistry

Chemistry · L4 · Stereochemistry — 6 Q

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Chemistry · L4 · Stereochemistry — 6 Q

Flowchart9 objects

Chemistry

Chemistry · L1 · You and Plants Swap Gases

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Chemistry · L1 · You and Plants Swap Gases

Flowchart18 objects

Chemistry

Chemistry · L3 · Paper Chromatography vs TLC

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Chemistry · L3 · Paper Chromatography vs TLC

MoleculeCCC

Chemistry

Chemistry · L3 · Propane

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Chemistry · L3 · Propane

Note~892 words · 4 min

Intermolecular forces & molecular polarity — vectors, polarizability, and boiling-point trends London dispersion, dipole-dipole, and hydrogen bonding explain WHICH forces act between molecules. This note goes one step further and asks HOW S

Chemistry

Chemistry · L4 · Intermolecular forces & molecular polarity — vectors, polarizability, and boiling-point trends

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Chemistry · L4 · Intermolecular forces & molecular polarity — vectors, polarizability, and boiling-point trends

Flowchart13 objects

Chemistry

Chemistry · L2 · Why pH Matters

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Chemistry · L2 · Why pH Matters

Note~457 words · 2 min

Energy in the Water Cycle You already know that a chemical reaction can be exothermic — releasing energy and getting warmer — or endothermic — absorbing energy and getting colder — and that a simple touch test on the container can tell you

Chemistry

Chemistry · L2 · Energy in the Water Cycle

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Chemistry · L2 · Energy in the Water Cycle

MoleculeReaction: C.O=O>>O=C=O.O

Chemistry

Chemistry · L3 · Combustion of methane

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Chemistry · L3 · Combustion of methane

Note~924 words · 5 min

Statement of the Third Law The third law of thermodynamics states that the entropy of a perfect, pure crystalline substance approaches zero as the temperature approaches absolute zero: At 0 K, a perfect crystal has its particles locked into

Chemistry

Chemistry · L5 · The Third Law and Absolute Entropy

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Chemistry · L5 · The Third Law and Absolute Entropy

Flowchart7 objects

Chemistry

Chemistry · L1 · How a Crystal Grows

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Chemistry · L1 · How a Crystal Grows

Flowchart15 objects

Chemistry

Chemistry · L5 · Host–Guest Selectivity Decision

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Chemistry · L5 · Host–Guest Selectivity Decision

MoleculeCC(=O)Nc1ccccc1

Chemistry

Chemistry · L4 · Acetanilide (target molecule)

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Chemistry · L4 · Acetanilide (target molecule)

Flowchart5 objects

Chemistry

Chemistry · L3 · Catalysts in Industry · flowchart

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Chemistry · L3 · Catalysts in Industry · flowchart

Note~944 words · 5 min

Faraday's laws of electrolysis: from current and time to mass deposited The earlier qualitative picture of electrolysis established which ion goes to which electrode, and what happens to it there — cations reduced at the cathode, anions oxi

Chemistry

Chemistry · L4 · Faraday's Laws of Electrolysis: quantifying charge, moles of electrons, and mass deposited

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Chemistry · L4 · Faraday's Laws of Electrolysis: quantifying charge, moles of electrons, and mass deposited

Flashcards10 cards

What two products form when a hydrocarbon undergoes complete combustion in plenty of oxygen?1 / 10

Carbon dioxide and water. Complete combustion also releases a lot of useful energy — the whole reason hydrocarbons are burned as fuels.

Chemistry

Chemistry · L3 · Combustion and Cracking of Hydrocarbons

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Chemistry · L3 · Combustion and Cracking of Hydrocarbons

Collection5 items

01Chemistry · L1 · Testing with Magnets

02Chemistry · L1 · Testing with Magnets

03Chemistry · L1 · The Magnet Test

+2 more

Chemistry

Chemistry · L1 · Testing with Magnets

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Chemistry · L1 · Testing with Magnets

Quiz5 questions

What is a 'strategic bond' in retrosynthetic analysis?

AAny bond that can theoretically be disconnected using a known reactionBA disconnection chosen because it maximally simplifies the target, e.g. by revealing symmetry or enabling a convergent couplingCThe first bond formed in the forward synthesisDA bond that must never be broken during synthesis planning

Chemistry

Chemistry · L5 · Total Synthesis Strategy

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Chemistry · L5 · Total Synthesis Strategy

Flowchart16 objects

Chemistry

Chemistry · L4 · Phase diagram: state changes of a pure substance

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Chemistry · L4 · Phase diagram: state changes of a pure substance

MoleculeO

Chemistry

A Water Molecule

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A Water Molecule

MoleculeReaction: O=[N+]([O-])c1ccccc1>>Nc1ccccc1

Chemistry

Chemistry · L4 · Forward step 1: nitrobenzene reduced to aniline

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Chemistry · L4 · Forward step 1: nitrobenzene reduced to aniline

Flowchart6 objects

Chemistry

Chemistry · L5 · Battery Chemistry & Materials · flowchart

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Chemistry · L5 · Battery Chemistry & Materials · flowchart

Flashcards9 cards

What is spectroelectrochemistry (SEC)?1 / 9

SEC couples an electrochemical perturbation (a controlled potential or current) with a simultaneous spectroscopic measurement (UV-vis, IR, Raman, EPR, or NMR) of the same sample volume, so that the electronic or structural identity of a species can be correlated directly with its formal potential rather than inferred indirectly from a voltammetric peak shape alone.

Chemistry

Chemistry · L5 · Spectroelectrochemistry

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Chemistry · L5 · Spectroelectrochemistry

Flowchart10 objects

Chemistry

Chemistry · L2 · Evaporation vs Condensation on Your Skin

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Chemistry · L2 · Evaporation vs Condensation on Your Skin

Quiz5 questions

At the same temperature, why does a lighter gas molecule move faster, on average, than a heavier one?

ABecause all gases have the same average kinetic energy at a given T, so a smaller mass requires a larger average speed to keep KE = (1/2)mv^2 the sameBBecause lighter molecules experience less gravityCBecause heavier molecules always have lower temperatureDThere is no such relationship — speed is unrelated to mass

Chemistry

Chemistry · L4 · Effusion, Diffusion & Graham's Law — 5 Q

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Chemistry · L4 · Effusion, Diffusion & Graham's Law — 5 Q

MoleculeO

Chemistry

Water

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Water

Note~863 words · 4 min

Lattice energy: charge, radius, and two ways to calculate it The Born-Haber cycle (covered as a Hess's-Law application elsewhere) is one way to obtain a lattice energy: measure everything else in the cycle experimentally and solve for the o

Chemistry

Chemistry · L4 · Lattice energy: what controls its size, and two ways to calculate it

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Chemistry · L4 · Lattice energy: what controls its size, and two ways to calculate it

Quiz6 questions

What does the Hartree-Fock method approximate the many-electron wavefunction as?

AA single Slater determinant of one-electron orbitals, solved self-consistentlyBAn exact sum over every possible electron configurationCA single electron density function of 3 coordinatesDA classical trajectory of point charges

Chemistry

Chemistry · L5 · Computational Chemistry & DFT Basics

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Chemistry · L5 · Computational Chemistry & DFT Basics

Quiz6 questions

According to Hückel's rule, how many π electrons must a planar, cyclic, fully conjugated ring have to be aromatic?

A4n π electronsB4n + 2 π electronsC2n + 4 π electronsDn π electrons

Chemistry

Chemistry · L4 · Aromatic Chemistry & EAS — 6 Q

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Chemistry · L4 · Aromatic Chemistry & EAS — 6 Q

Flowchart15 objects

Chemistry

Chemistry · L3 · Which Intermolecular Forces Act on a Molecule?

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Chemistry · L3 · Which Intermolecular Forces Act on a Molecule?

Note~271 words · 1 min

Reading Hazard Symbols Chemical containers and lab bottles carry hazard pictograms — small pictures inside a diamond or square that warn you what kind of danger is inside, before you even open the label's fine print. A container can show mo

Chemistry

Chemistry · L2 · Chemical Safety and Hazard Symbols

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Chemistry · L2 · Chemical Safety and Hazard Symbols

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