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Chemistry: explore STEM content (page 36 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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Chemistry

Chemistry · L3 · Rate vs Concentration (First-Order)

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Chemistry · L3 · Rate vs Concentration (First-Order)

Flowchart21 objects

Chemistry

Chemistry · L3 · Assigning an Oxidation Number

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Chemistry · L3 · Assigning an Oxidation Number

Note~316 words · 2 min

Air Is Really There Air is all around you, right now. You cannot see it, but it is a real thing, just like water or wood. You can feel air when the wind blows on your face, and you can trap it inside a balloon. Air is not one single thing —

Chemistry

Chemistry · L1 · Air, Breathing, and Gases

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Chemistry · L1 · Air, Breathing, and Gases

Quiz5 questions

In cell notation, what does the double line "||" represent?

AA phase boundary between an electrode and its solutionBThe salt bridge (or porous membrane) connecting the two half-cellsCTwo ions coexisting in the same solutionDThe direction of conventional current flow

Chemistry

Chemistry · L4 · Cell Notation and Concentration Cells — 5 Q

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Chemistry · L4 · Cell Notation and Concentration Cells — 5 Q

Flowchart7 objects

Chemistry

Chemistry · L1 · Baking Soda Ink, Step by Step

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Chemistry · L1 · Baking Soda Ink, Step by Step

Flashcards9 cards

What happens to electrons when an IONIC bond forms?1 / 9

One atom (a metal) transfers one or more electrons to another atom (a non-metal). Both end up with full outer shells, but now as oppositely charged ions that attract each other electrostatically.

Chemistry

Chemistry · L3 · Ionic, Covalent & Metallic Bonding

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Chemistry · L3 · Ionic, Covalent & Metallic Bonding

Flowchart8 objects

Chemistry

Chemistry · L4 · Chemical kinetics: rate laws, activation energy, and catalysis · flowchart

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Chemistry · L4 · Chemical kinetics: rate laws, activation energy, and catalysis · flowchart

Quiz5 questions

What is the full range of the pH scale?

A0 to 7B0 to 10C0 to 14D1 to 100

Chemistry

Chemistry · L2 · Acids, Bases & the pH Scale

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Chemistry · L2 · Acids, Bases & the pH Scale

Note~434 words · 2 min

Metal + Acid → Salt + Hydrogen As you saw in the reactivity series, a reactive metal added to an acid fizzes — sometimes fast, sometimes slowly. That fizzing is a real chemical reaction, and it always follows the same pattern: the metal dis

Chemistry

Chemistry · L2 · Metals Reacting with Acids

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Chemistry · L2 · Metals Reacting with Acids

MoleculeN

Chemistry

Chemistry · L3 · Ammonia (NH₃)

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Chemistry · L3 · Ammonia (NH₃)

Flowchart7 objects

Chemistry

Chemistry · L2 · Natural pH Indicators · flowchart

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Chemistry · L2 · Natural pH Indicators · flowchart

Flowchart7 objects

Chemistry

Chemistry · L2 · Chemical Reactions & Word Equations · flowchart

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Chemistry · L2 · Chemical Reactions & Word Equations · flowchart

Quiz7 questions

The structure below is caffeine, the stimulant in coffee and tea. How many nitrogen atoms does one caffeine molecule contain?

A2B3C4D6

Chemistry

Chemistry · L3 · Reading Structures, Equations & Curves — 7 Q

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Chemistry · L3 · Reading Structures, Equations & Curves — 7 Q

Note~649 words · 3 min

Reaction mechanisms and the rate-determining step The balanced equation for a reaction only shows the starting materials and the final products — it doesn't show HOW they get there. Many reactions don't happen in a single collision at all.

Chemistry

Chemistry · L3 · Reaction Mechanisms and the Rate-Determining Step

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Chemistry · L3 · Reaction Mechanisms and the Rate-Determining Step

Collection6 items

01Chemistry · L5 · 2D NMR: COSY & HSQC

02Chemistry · L5 · Karplus Equation & Coupling-Constant Analysis

03Chemistry · L5 · Advanced NMR: 2D Techniques & Coupling Analysis

+3 more

Chemistry

Chemistry · L5 · Advanced NMR: 2D Techniques

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Chemistry · L5 · Advanced NMR: 2D Techniques

Quiz6 questions

Why does a helium-filled balloon float up through the air?

ABecause balloons are always lighter than air, no matter what is insideBBecause the helium inside is packed together more loosely than the air around itCBecause helium is a bright colorDBecause the string pulls it upward

Chemistry

Chemistry · L1 · Why Helium Balloons Float Up

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Chemistry · L1 · Why Helium Balloons Float Up

Flashcards8 cards

What is a reactant?1 / 8

A reactant is a substance you start with in a chemical reaction. Reactants get used up as the reaction happens.

Chemistry

Chemistry · L2 · Chemical Reactions & Word Equations

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Chemistry · L2 · Chemical Reactions & Word Equations

Flashcards9 cards

What is a metal-organic framework (MOF)?1 / 9

A MOF is a crystalline, porous solid built from metal ions or metal-oxo clusters (nodes) connected by multitopic organic ligands (linkers) into an extended, often highly ordered three-dimensional network, leaving a permanent internal pore system accessible to guest molecules once the pores are evacuated of synthesis solvent.

Chemistry

Chemistry · L5 · Metal-Organic Frameworks

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Chemistry · L5 · Metal-Organic Frameworks

Flashcards8 cards

What does a Jablonski diagram depict?1 / 8

A Jablonski diagram maps the electronic and vibrational energy levels a molecule can occupy after absorbing a photon, and every pathway back down: fluorescence, intersystem crossing, phosphorescence, and non-radiative decay. Vertical position represents energy; singlet states (S₀, S₁, S₂, …) and triplet states (T₁, T₂, …) are drawn as separate manifolds because they differ in spin multiplicity.

Chemistry

Chemistry · L5 · Photochemistry

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Chemistry · L5 · Photochemistry

Flashcards10 cards

Why does a bike frame left outside all year get rustier than one kept in a garage?1 / 10

The bike left outside gets rained on and sits in damp air all the time. The metal almost never gets to dry out, so it rusts much faster.

Chemistry

Chemistry · L1 · Weathering: Why Outdoor Metal Rusts

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Chemistry · L1 · Weathering: Why Outdoor Metal Rusts

Flowchart15 objects

Chemistry

Chemistry · L5 · Statistical Thermodynamics: Boltzmann Distribution, Partition Functions & Entropy · flowchart

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Chemistry · L5 · Statistical Thermodynamics: Boltzmann Distribution, Partition Functions & Entropy · flowchart

Flashcards8 cards

How did Jean-Marie Lehn define supramolecular chemistry, and how does it differ from ordinary molecular chemistry?1 / 8

Lehn described supramolecular chemistry as "chemistry beyond the molecule" — the study of organized entities (supermolecules and assemblies) held together not by covalent bonds but by non-covalent intermolecular forces. Where molecular chemistry is the chemistry of the covalent bond, supramolecular chemistry is the chemistry of molecular recognition, self-assembly, and reversible binding between complementary partners.

Chemistry

Chemistry · L5 · Supramolecular Chemistry: Foundations

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Chemistry · L5 · Supramolecular Chemistry: Foundations

Flashcards11 cards

What fundamentally distinguishes a redox titration from an acid–base titration?1 / 11

The titrant and analyte react by transferring electrons (a redox reaction), not protons. The endpoint is also detected differently — by a redox-driven colour change rather than a pH indicator.

Chemistry

Chemistry · L3 · Redox Titrations

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Chemistry · L3 · Redox Titrations

Flowchart10 objects

Chemistry

Chemistry · L1 · Metals and Non-metals · flowchart

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Chemistry · L1 · Metals and Non-metals · flowchart

Flowchart7 objects

Chemistry

Chemistry · L1 · The Everyday Water Cycle

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Chemistry · L1 · The Everyday Water Cycle

Quiz5 questions

HDPE and LDPE are both addition polymers of ethene, yet HDPE is rigid and LDPE is flexible. What best explains this difference?

AHDPE chains are cross-linked with sulfur, LDPE chains are notBHDPE has long, straight chains that pack tightly; LDPE has short, branched chains that pack looselyCHDPE is a condensation polymer while LDPE is an addition polymerDHDPE and LDPE are made from different monomers

Chemistry

Chemistry · L3 · Polymer Structure and Properties — 5 Q

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Chemistry · L3 · Polymer Structure and Properties — 5 Q

Flashcards11 cards

In everyday terms, what does 'entropy' actually measure?1 / 11

Entropy measures how spread out or disordered energy and matter are. Low entropy means energy or particles are concentrated and orderly; high entropy means they are spread out and jumbled up.

Chemistry