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Chemistry: explore STEM content (page 35 of 47) · openstem

All fields Software Mathematics Physics Chemistry Biology Engineering Astronomy Environmental Other Chemistry Chemistry groups

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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.

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Chemistry

Chemistry · L3 · Ethane

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Chemistry · L3 · Ethane

Quiz5 questions

What fundamental distinction separates activity-based protein profiling (ABPP) from abundance-based proteomic methods?

AABPP measures whether an enzyme is catalytically active, while abundance methods measure total protein present regardless of activityBABPP can only be used on purified, isolated proteins, never in cellsCAbundance-based methods always report enzyme activity accuratelyDThere is no meaningful difference between the two approaches

Chemistry

Chemistry · L5 · Chemical Biology & Activity-Based Probes

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Chemistry · L5 · Chemical Biology & Activity-Based Probes

Flowchart13 objects

Chemistry

Chemistry · L5 · Metal-Organic Frameworks · flowchart

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Chemistry · L5 · Metal-Organic Frameworks · flowchart

Note~680 words · 3 min

Beyond a single test A single spot test — one reagent, one observation — can narrow an unknown down, but several common cations look identical after just one step: more than one gives a white precipitate with sodium hydroxide, for instance.

Chemistry

Chemistry · L4 · Systematic Qualitative Inorganic Analysis

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Chemistry · L4 · Systematic Qualitative Inorganic Analysis

Flashcards10 cards

What happens when you add a splash of vinegar to milk?1 / 10

The milk curdles — it turns lumpy, with soft white clumps floating in watery liquid.

Chemistry

Chemistry · L1 · Milk and Vinegar Curdling

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Chemistry · L1 · Milk and Vinegar Curdling

Collection5 items

01Chemistry · L2 · The Reactivity Series

02Chemistry · L2 · Evidence, Rust, and Uses

03Chemistry · L2 · Metals and Reactivity

+2 more

Chemistry

Chemistry · L2 · Metals and Reactivity

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Chemistry · L2 · Metals and Reactivity

Flowchart14 objects

Chemistry

Chemistry · L1 · Found an Unknown Bottle

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Chemistry · L1 · Found an Unknown Bottle

Flashcards10 cards

What happens if you leave a cup of salty water out for many days?1 / 10

The water slowly disappears into the air. Salt crystals are left behind at the bottom of the cup!

Chemistry

Chemistry · L1 · Growing Crystals at Home

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Chemistry · L1 · Growing Crystals at Home

Flashcards12 cards

How does instrumental chromatography (HPLC, GC) differ fundamentally from paper or TLC chromatography?1 / 12

There is no visible spot on a stationary surface to measure by eye. Instead, the mobile phase carries the sample through an enclosed column, a detector at the far end registers each compound as it emerges, and the compound is characterized by how long it took to travel through the column — its retention time — rather than by a distance travelled up a plate.

Chemistry

Chemistry · L4 · Instrumental Chromatography — HPLC and GC

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Chemistry · L4 · Instrumental Chromatography — HPLC and GC

Quiz6 questions

Why can EDTA form an unusually stable 1:1 complex with a metal ion compared to a simple monodentate ligand such as NH3?

AEDTA is a much smaller molecule than NH3, so it fits into the metal ion more easilyBEDTA has six donor atoms (2 N, 4 O) that can all coordinate to the same metal ion simultaneously, wrapping around it almost completely (the chelate effect)CEDTA reacts with water before it can bind any metal ion, releasing extra heatDEDTA only binds transition metals, never main-group ions like Ca²⁺ or Mg²⁺

Chemistry

Chemistry · L4 · EDTA Complexometric Titration

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Chemistry · L4 · EDTA Complexometric Titration

Flowchart9 objects

Chemistry

Chemistry · L1 · Sorting a Trail Mix

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Chemistry · L1 · Sorting a Trail Mix

Note~492 words · 2 min

Organic reaction mechanisms: nucleophiles, electrophiles, and arrow pushing A reaction mechanism is a step-by-step account of how bonds break and form during a chemical reaction. Each elementary step is represented by curved arrows that sho

Chemistry

Chemistry · L4 · Organic reaction mechanisms: nucleophiles, electrophiles, and arrow pushing

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Chemistry · L4 · Organic reaction mechanisms: nucleophiles, electrophiles, and arrow pushing

Flowchart22 objects

Chemistry

Chemistry · L3 · Periodic Trends · flowchart

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Chemistry · L3 · Periodic Trends · flowchart

Flowchart9 objects

Chemistry

Chemistry · L1 · Soap's Two Ends

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Chemistry · L1 · Soap's Two Ends

Flowchart7 objects

Chemistry

Chemistry · L4 · Organic reaction mechanisms: nucleophiles, electrophiles, and arrow pushing · flowchart

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Chemistry · L4 · Organic reaction mechanisms: nucleophiles, electrophiles, and arrow pushing · flowchart

Note~330 words · 2 min

Why Do Things Float or Sink? Drop something into water and it will do one of two things: float on top, or sink to the bottom. What decides which one happens? It Is Not Just About Weight A huge metal ship floats, but a tiny pebble sinks. Tha

Chemistry

Chemistry · L1 · Why Do Things Float or Sink?

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Chemistry · L1 · Why Do Things Float or Sink?

Quiz5 questions

What happens to chocolate when it gets hot?

AIt melts into a liquidBIt turns to steamCIt gets harderDIt disappears completely

Chemistry

Chemistry · L1 · Heating and Cooling in the Kitchen

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Chemistry · L1 · Heating and Cooling in the Kitchen

Flowchart13 objects

Chemistry

Chemistry · L3 · Successful vs Unsuccessful Collision

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Chemistry · L3 · Successful vs Unsuccessful Collision

Collection3 items

01Chemistry · L5 · Single-Molecule Spectroscopy

02Chemistry · L5 · Single-Molecule Spectroscopy

03Chemistry · L5 · Single-Molecule Spectroscopy

Chemistry

Chemistry · L5 · Single-Molecule Spectroscopy

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Chemistry · L5 · Single-Molecule Spectroscopy

Flowchart7 objects

Chemistry

Chemistry · L5 · Click Chemistry and Bioorthogonal Labeling · flowchart

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Chemistry · L5 · Click Chemistry and Bioorthogonal Labeling · flowchart

Note~633 words · 3 min

Ionic and Covalent Bonding Atoms bond because a full outer shell of electrons is more stable than a partly-full one. There are two main ways atoms reach that stability together: by TRANSFERRING electrons (ionic bonding) or by SHARING electr

Chemistry