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Chemistry: explore STEM content (page 14 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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Collection9 items

01Chemistry · L4 · Aromatic Chemistry & EAS

02Chemistry · L4 · Aromatic Chemistry & Electrophilic Aromatic Substitution

03Chemistry · L4 · EAS Mechanism: Attack, Arenium Ion, Rearomatisation

+6 more

Chemistry

Chemistry · L4 · Aromatic Chemistry

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Chemistry · L4 · Aromatic Chemistry

Note~457 words · 2 min

Solubility and Solutions When a solid, liquid, or gas dissolves completely into a liquid, the result is called a solution. The substance that dissolves is the solute, and the substance that does the dissolving is the solvent. Stir a spoon o

Chemistry

Chemistry · L2 · Solubility and Solutions

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Chemistry · L2 · Solubility and Solutions

Flowchart18 objects

Chemistry

Chemistry · L3 · Chemical Equilibrium & Le Chatelier's Principle · flowchart

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Chemistry · L3 · Chemical Equilibrium & Le Chatelier's Principle · flowchart

Collection6 items

01Chemistry · L1 · Everyday Chemical Changes

02Chemistry · L1 · Spotting a Chemical Change

03Chemistry · L1 · Is It a Chemical Change?

+3 more

Chemistry

Chemistry · L1 · Everyday Chemical Changes

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Chemistry · L1 · Everyday Chemical Changes

Flowchart11 objects

Chemistry

Chemistry · L2 · Solubility and Solutions · flowchart

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Chemistry · L2 · Solubility and Solutions · flowchart

Flowchart9 objects

Chemistry

Chemistry · L3 · Gas Volume Stoichiometry: Which Direction?

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Chemistry · L3 · Gas Volume Stoichiometry: Which Direction?

Collection4 items

01Chemistry · L4 · Polyprotic Acids

02Chemistry · L4 · Polyprotic acids: stepwise dissociation, successive Ka values, and multi-equivalence-point titrations

03Chemistry · L4 · Multi-equivalence-point titration curve of a triprotic acid

+1 more

Chemistry

Chemistry · L4 · Polyprotic Acids

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Chemistry · L4 · Polyprotic Acids

Flashcards10 cards

How does the Lewis definition of an acid differ from the Brønsted-Lowry definition?1 / 10

Brønsted-Lowry: an acid donates a proton (H⁺). Lewis: an acid accepts a pair of electrons — a broader definition that includes species with no protons at all, such as BF₃ or a bare metal cation.

Chemistry

Chemistry · L4 · Lewis Acids and Bases

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Chemistry · L4 · Lewis Acids and Bases

Flowchart4 objects

Chemistry

Chemistry · L1 · Oil and Water Don't Mix · flowchart

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Chemistry · L1 · Oil and Water Don't Mix · flowchart

Flowchart6 objects

Chemistry

Chemistry · L1 · Dissolving vs. Melting · flowchart

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Chemistry · L1 · Dissolving vs. Melting · flowchart

Flashcards9 cards

What is the fundamental difference between batch and continuous-flow synthesis?1 / 9

In batch synthesis, all reagents are combined in a single vessel and the reaction proceeds over time in that same volume. In continuous-flow synthesis, reagent streams are pumped continuously through a reactor (often narrow tubing or a microstructured chip), and a given parcel of fluid reacts only during the fixed time it takes to traverse the reactor — the residence time — set purely by flow rate and reactor volume, decoupling reaction time from vessel dwell and enabling steady-state operation.

Chemistry

Chemistry · L5 · Flow Chemistry & Continuous Processing

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Chemistry · L5 · Flow Chemistry & Continuous Processing

Flashcards8 cards

What happens to egg white when you cook it?1 / 8

It turns from clear and runny to white and firm. It can never go back to being runny again — that's a chemical change.

Chemistry

Chemistry · L1 · Everyday Chemical Changes

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Chemistry · L1 · Everyday Chemical Changes

Flowchart9 objects

Chemistry

Chemistry · L4 · Nuclear Chemistry — Binding Energy per Nucleon Curve

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Chemistry · L4 · Nuclear Chemistry — Binding Energy per Nucleon Curve

Note~455 words · 2 min

Why Helium Balloons Float Up Let go of a helium balloon and it does not just sit there — it rises up, up, and away until you lose sight of it. But a balloon you blow up yourself just sits on the floor, or floats gently at the height you lef

Chemistry

Chemistry · L1 · Why Helium Balloons Float Up

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Chemistry · L1 · Why Helium Balloons Float Up

Flashcards6 cards

What is a hazard symbol?1 / 6

A hazard symbol is a picture on a bottle. It warns you that what's inside could hurt you.

Chemistry

Chemistry · L1 · Warning Pictures on Bottles

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Chemistry · L1 · Warning Pictures on Bottles

Flowchart10 objects

Chemistry

Chemistry · L5 · Computational Chemistry & DFT Basics · flowchart

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Chemistry · L5 · Computational Chemistry & DFT Basics · flowchart

Flowchart13 objects

Chemistry

Chemistry · L4 · Gas Chromatography (GC) Pipeline

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Chemistry · L4 · Gas Chromatography (GC) Pipeline

Flashcards11 cards

In a pure metal, why can layers of metal ions slide past each other without breaking the metallic bond?1 / 11

The bonding electrons are delocalised into a shared sea that surrounds the whole lattice rather than belonging to any fixed pair of atoms. When a layer slides, the electron sea simply flows to keep surrounding whichever ions are now nearby — no fixed bond has to break in a particular direction.

Chemistry

Chemistry · L3 · Metallic Bonding and Why Alloys Are Harder

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Chemistry · L3 · Metallic Bonding and Why Alloys Are Harder

Note~569 words · 3 min

Acid Rain: When Air Pollution Falls as Rain Acid rain is rain, snow, or fog that has become far more acidic than normal because of air pollution. It forms when two families of gases — sulfur dioxide (SO2) and nitrogen oxides (NOx) — are rel

Chemistry

Chemistry · L3 · Acid Rain

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Chemistry · L3 · Acid Rain

Flowchart11 objects

Chemistry

Chemistry · L5 · Atropisomerism and Axial Chirality · flowchart

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Chemistry · L5 · Atropisomerism and Axial Chirality · flowchart

Note~480 words · 2 min

Esterification: Alcohol + Acid → Ester + Water You've already met the alcohol group (–OH) and the carboxylic acid group (–COOH). Put an alcohol and a carboxylic acid together — usually with an acid catalyst such as concentrated sulfuric aci

Chemistry

Chemistry · L3 · Esters — Formation and Uses

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Chemistry · L3 · Esters — Formation and Uses

Note~508 words · 3 min

Two ways to build a polymer A polymer is a long chain of repeating monomers — that much you already know. What matters now is HOW the monomers actually join up. There are two distinct mechanisms, and knowing which one built a plastic tells

Chemistry

Chemistry · L3 · Two Ways to Build a Polymer

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Chemistry · L3 · Two Ways to Build a Polymer

Quiz6 questions

What makes bread dough puff up?

ATiny trapped bubbles of gasBThe dough getting colderCExtra water soaking inDThe dough turning into a solid rock

Chemistry

Chemistry · L1 · Why Bread and Cakes Rise

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Chemistry · L1 · Why Bread and Cakes Rise

Note~198 words · 1 min

Secular Determinant from Variational Principle For an MO ψ = Σᵢ cᵢχᵢ, minimising E = ⟨ψ|Ĥ|ψ⟩/⟨ψ|ψ⟩ with respect to each cⱼ yields the secular equations: Non-trivial solutions require the secular determinant to vanish: Hückel Results for Ben

Chemistry

Chemistry · L5 · Molecular Orbital Theory: Secular Equations & Frontier Orbitals

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Chemistry · L5 · Molecular Orbital Theory: Secular Equations & Frontier Orbitals

Flowchart8 objects

Chemistry

Chemistry · L4 · Atmospheric Chemistry — Ozone and the Greenhouse Effect · flowchart

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Chemistry · L4 · Atmospheric Chemistry — Ozone and the Greenhouse Effect · flowchart

Flowchart16 objects

Chemistry

Chemistry · L2 · Comparing Food Preservation Methods

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Chemistry · L2 · Comparing Food Preservation Methods

Quiz5 questions

In retrosynthetic analysis, which direction does the disconnection arrow point, and why?

AFrom the complex target toward simpler precursors, since the analysis works backward from the targetBFrom simple starting materials toward the target, identical to a forward reaction arrowCIt has no defined directionDFrom the solvent toward the product

Chemistry

Chemistry · L4 · Organic Synthesis Routes — 5 Q

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Chemistry · L4 · Organic Synthesis Routes — 5 Q

Note~813 words · 4 min

Combustion Analysis: Measuring a Formula by Burning It You already know how to write a balanced complete-combustion equation for a hydrocarbon given its formula, and how to turn a GIVEN percent composition into an empirical formula. Combust

Chemistry

Chemistry · L3 · Combustion Analysis

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Chemistry · L3 · Combustion Analysis

Note~258 words · 1 min

Hidden Colors in a Black Marker A black marker looks like it draws just one plain color: black. But many black markers are secretly a mix of several colors blended together so well that they look black. How to Reveal the Hidden Colors As th

Chemistry

Chemistry · L1 · Hidden Colors in a Black Marker

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Chemistry · L1 · Hidden Colors in a Black Marker

Note~761 words · 4 min

Chemiluminescence: The Opposite Starting Point Photochemistry starts with a photon going IN: a molecule absorbs light, is promoted to an excited electronic state, and eventually relaxes back down, sometimes emitting light of its own as fluo

Chemistry

Chemistry · L5 · Chemiluminescence: Light Out With No Light In

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Chemistry · L5 · Chemiluminescence: Light Out With No Light In

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