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Chemistry: explore STEM content (page 4 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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Flashcards10 cards

What happens when you stir sugar into warm tea?1 / 10

The sugar dissolves — it spreads out into tiny pieces you can no longer see.

Chemistry

Chemistry · L1 · Dissolving vs. Melting

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Chemistry · L1 · Dissolving vs. Melting

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Chemistry

Chemistry · L3 · The Ocean Buffer Under Pressure

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Chemistry · L3 · The Ocean Buffer Under Pressure

Flowchart12 objects

Chemistry

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

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

Collection6 items

01Chemistry · L5 · Marcus Theory & Electron Transfer Kinetics

02Chemistry · L5 · Marcus Theory: Why and How Fast Electron Transfer Happens

03Chemistry · L5 · The three factors that set the electron-transfer rate

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Chemistry

Chemistry · L5 · Marcus Theory & Electron Transfer

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Chemistry · L5 · Marcus Theory & Electron Transfer

Collection4 items

01Chemistry · L4 · Systematic Qualitative Inorganic Analysis

02Chemistry · L4 · Systematic Qualitative Inorganic Analysis

03Chemistry · L4 · Anion tests: sulfate, carbonate, nitrate

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Chemistry

Chemistry · L4 · Systematic Qualitative Inorganic Analysis

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Chemistry · L4 · Systematic Qualitative Inorganic Analysis

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Chemistry

Chemistry · L3 · Redox Titrations · flowchart

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Chemistry · L3 · Redox Titrations · flowchart

Collection4 items

01Chemistry · L3 · Buffers — Resisting pH Change

02Chemistry · L3 · Buffers — Resisting pH Change

03Chemistry · L3 · Buffers — Resisting pH Change

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Chemistry

Chemistry · L3 · Buffers — Resisting pH Change

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Chemistry · L3 · Buffers — Resisting pH Change

Collection5 items

01Chemistry · L5 · Ligand Field Theory

02Chemistry · L5 · Ligand Field Theory: Spectrochemical Series, Spin State, and Jahn–Teller Distortion

03Chemistry · L5 · Spectrochemical Series — Weak-Field to Strong-Field Ligands

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Chemistry

Chemistry · L5 · Ligand Field Theory

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Chemistry · L5 · Ligand Field Theory

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Chemistry

Chemistry · L5 · Advanced Radical Chemistry · flowchart

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Chemistry · L5 · Advanced Radical Chemistry · flowchart

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Chemistry

Chemistry · L3 · Atomic Structure & Electron Shells · flowchart

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Chemistry · L3 · Atomic Structure & Electron Shells · flowchart

Note~290 words · 1 min

Chemical Symbols Every element has its own shorthand code called a chemical symbol — one or two letters that chemists everywhere understand, no matter what language they speak. Notice the pattern: a symbol with two letters always has a capi

Chemistry

Chemistry · L2 · Elements, Compounds & Chemical Formulae

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Chemistry · L2 · Elements, Compounds & Chemical Formulae

MoleculeReaction: Nc1ccccc1.CC(=O)OC(C)=O>>CC(=O)Nc1ccccc1…

Chemistry

Chemistry · L4 · Forward step 2: aniline acylated to acetanilide

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Chemistry · L4 · Forward step 2: aniline acylated to acetanilide

Collection4 items

01Chemistry · L4 · Back Titration

02Chemistry · L4 · Back Titration: The Excess-and-Subtract Method

03Chemistry · L4 · Choosing Back Titration Over Direct Titration

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Chemistry

Chemistry · L4 · Back Titration

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Chemistry · L4 · Back Titration

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Chemistry

Chemistry · L3 · Balancing by Half-Equations

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Chemistry · L3 · Balancing by Half-Equations

Flashcards12 cards

A chiral bidentate phosphine like BINAP replaces PPh3 in a Wilkinson's-type hydrogenation catalyst. Which elementary steps of the catalytic cycle stay exactly the same?1 / 12

The same skeleton as the achiral Wilkinson's cycle: ligand dissociation to open a site, oxidative addition of H2, alkene association, migratory insertion of the alkene into a Rh–H bond, and reductive elimination to release the alkane and regenerate the active catalyst. Nothing about those five steps changes — what changes is the shape of the ligand sitting on the metal throughout all of them.

Chemistry

Chemistry · L5 · Asymmetric Catalysis Mechanisms

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Chemistry · L5 · Asymmetric Catalysis Mechanisms

MoleculeO

Chemistry

Chemistry · L1 · A Water Molecule

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Chemistry · L1 · A Water Molecule

Flowchart17 objects

Chemistry

Chemistry · L3 · Diagnosing and Treating Hard Water

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Chemistry · L3 · Diagnosing and Treating Hard Water

Flowchart20 objects

Chemistry

Chemistry · L4 · Classifying reaction order by successive half-lives

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Chemistry · L4 · Classifying reaction order by successive half-lives

Flashcards8 cards

What is activity-based protein profiling (ABPP), and how does it differ fundamentally from measuring protein abundance (e.g. by Western blot or mass spectrometry proteomics)?1 / 8

ABPP uses a small-molecule probe that covalently reacts with the catalytically active form of a target enzyme class, so the labeling signal reports specifically on enzymatic ACTIVITY (whether the enzyme's catalytic machinery is functional and accessible) rather than total protein ABUNDANCE. This distinction matters because an enzyme can be abundantly present yet catalytically silent — inhibited, mutated, or held in an inactive conformation/zymogen state — and abundance-only methods cannot detect that difference, while an ABP specifically fails to label an inactive enzyme copy even if it is present in equal or greater amount.

Chemistry

Chemistry · L5 · Chemical Biology & Activity-Based Probes

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Chemistry · L5 · Chemical Biology & Activity-Based Probes

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Chemistry

Chemistry · L2 · Bond Energy Balance

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Chemistry · L2 · Bond Energy Balance

Flowchart13 objects

Chemistry

Chemistry · L4 · Osmosis vs Reverse Osmosis

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Chemistry · L4 · Osmosis vs Reverse Osmosis

Flashcards12 cards

What is a salt, in the chemistry sense?1 / 12

A salt is a compound formed when the hydrogen in an acid is replaced by a metal (or a similar positive ion). It is always one of the products when an acid reacts with a metal, a base, or a metal carbonate.

Chemistry

Chemistry · L2 · Making Salts

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Chemistry · L2 · Making Salts

Quiz5 questions

What is a secondary building unit (SBU) in MOF chemistry?

AA single isolated metal ion with no defined geometryBA rigid, geometrically predictable polynuclear metal-oxo cluster that acts as a network nodeCThe organic linker molecule aloneDA solvent molecule trapped in the framework pores

Chemistry

Chemistry · L5 · Metal-Organic Frameworks

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Chemistry · L5 · Metal-Organic Frameworks

Flowchart19 objects

Chemistry

Chemistry · L5 · Controlled and Living Polymerization · flowchart

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Chemistry · L5 · Controlled and Living Polymerization · flowchart

Flashcards7 cards

State the exponential decay law and define every symbol in it.1 / 7

N(t) = N₀e^(-λt). N₀ is the number of radioactive nuclei (or activity) at t = 0, N(t) is the number remaining after time t, and λ is the decay constant — the fixed probability of decay per unit time for a single nucleus (units: inverse time).

Chemistry

Chemistry · L4 · Nuclear Chemistry — The Decay Law & Radiometric Dating

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Chemistry · L4 · Nuclear Chemistry — The Decay Law & Radiometric Dating

Quiz6 questions

What defines the limiting reagent in a chemical reaction?

AThe reactant present in the smallest massBThe reactant that runs out first, capping the amount of product that can formCThe reactant with the largest molar massDThe reactant listed first in the balanced equation

Chemistry

Chemistry · L3 · Limiting Reagents and Percent Yield — 6 Q

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Chemistry · L3 · Limiting Reagents and Percent Yield — 6 Q

Quiz5 questions

In N = N₀e^(-λt), what does the decay constant λ physically represent?

AThe number of half-lives that have elapsedBThe probability of decay per unit time for a single nucleusCThe total mass lost during the entire decay processDThe fraction of the sample remaining after one half-life

Chemistry

Chemistry · L4 · Nuclear Chemistry (Quantitative) — 5 Q

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Chemistry · L4 · Nuclear Chemistry (Quantitative) — 5 Q

Flashcards12 cards

What makes water 'hard'?1 / 12

Dissolved calcium ions (Ca²⁺) and magnesium ions (Mg²⁺). Water picks these up as it flows over and through rock containing minerals such as limestone and chalk, which slowly dissolve into it.

Chemistry