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Chemistry: explore STEM content (page 11 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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Flowchart15 objects

Chemistry

Chemistry · L4 · Periodic Anomalies · flowchart

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Chemistry · L4 · Periodic Anomalies · flowchart

Flowchart12 objects

Chemistry

Chemistry · L2 · Reading the Formula H2O

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Chemistry · L2 · Reading the Formula H2O

Flowchart17 objects

Chemistry

Chemistry · L2 · Testing for Gases · flowchart

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Chemistry · L2 · Testing for Gases · flowchart

Flowchart18 objects

Chemistry

Chemistry · L4 · Buffer Response to Added Strong Acid or Base

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Chemistry · L4 · Buffer Response to Added Strong Acid or Base

Quiz6 questions

What does the third law of thermodynamics state?

AThe entropy of any substance is zero at room temperatureBThe entropy of a perfect, pure crystalline substance approaches zero as temperature approaches absolute zeroCEnthalpy and entropy become equal at absolute zeroDNo process can reach absolute zero in a finite number of steps

Chemistry

Chemistry · L5 · The Third Law and Absolute Entropy

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Chemistry · L5 · The Third Law and Absolute Entropy

Flashcards7 cards

What is a mixture?1 / 7

A mixture is two or more substances combined together but not chemically joined. Each substance keeps its own properties, and the mixture can usually be separated back into its parts.

Chemistry

Chemistry · L2 · Mixtures and Solutions

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Chemistry · L2 · Mixtures and Solutions

Quiz5 questions

What does an empirical formula represent?

AThe exact number of atoms of each element in one moleculeBThe simplest whole-number ratio of atoms of each element in a compoundCThe total mass of the compound in gramsDThe number of moles in a 1 g sample

Chemistry

Chemistry · L3 · Empirical and Molecular Formula — 5 Q

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Chemistry · L3 · Empirical and Molecular Formula — 5 Q

Collection7 items

01Chemistry · L4 · Amino Acid Structure

02Chemistry · L4 · From amino acids to protein structure — a chemist's view

03Chemistry · L4 · Building a polypeptide: repeated condensation

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Chemistry

Chemistry · L4 · Biochemistry Basics

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Chemistry · L4 · Biochemistry Basics

Note~232 words · 1 min

Something New! A chemical change makes a whole new substance. Once it happens, you can't turn it back into what it was before. How do you know a chemical change happened? Look for these clues: Cooking an egg: the clear, runny egg white turn

Chemistry

Chemistry · L1 · Spotting a Chemical Change

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Chemistry · L1 · Spotting a Chemical Change

Quiz6 questions

Which term describes a host cavity already pre-shaped to match its guest before binding, minimizing the energetic and entropic cost of complex formation?

APreorganizationBTautomerismCRacemizationDIsomerism

Chemistry

Chemistry · L5 · Supramolecular Chemistry

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Chemistry · L5 · Supramolecular Chemistry

Quiz5 questions

What makes a solid a crystal?

AIt is always clear and colourlessBIts particles are arranged in a regular, repeating patternCIt can only be made by humansDIt has no fixed shape

Chemistry

Chemistry · L2 · Crystals and Crystallization

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Chemistry · L2 · Crystals and Crystallization

Flashcards10 cards

What is a smell actually made of?1 / 10

A smell is made of tiny, invisible particles. They come off a substance and float through the air to your nose.

Chemistry

Chemistry · L1 · Where Do Smells Come From?

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Chemistry · L1 · Where Do Smells Come From?

Collection4 items

01Chemistry · L2 · How Batteries Work

02Chemistry · L2 · How Batteries Work

03Chemistry · L2 · Single-Use vs Rechargeable Batteries

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Chemistry

Chemistry · L2 · How Batteries Work

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Chemistry · L2 · How Batteries Work

Flashcards7 cards

What is a crystal?1 / 7

A crystal is a solid whose particles (atoms, ions, or molecules) are arranged in a regular, repeating pattern. That orderly pattern is what gives crystals their flat faces and straight edges.

Chemistry

Chemistry · L2 · Crystals — The Basics

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Chemistry · L2 · Crystals — The Basics

Note~566 words · 3 min

Timing the Untimeable: Radical Clocks Some radical reactions are too fast to time by direct spectroscopic observation. A radical clock substrate contains a unimolecular rearrangement with a precisely known rate constant — classically cyclop

Chemistry

Chemistry · L5 · Advanced Radical Chemistry

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Chemistry · L5 · Advanced Radical Chemistry

Quiz4 questions

According to Hückel's rule, which of the following is aromatic?

ACyclooctatetraene (8 π electrons)BCyclopentadienyl cation (4 π electrons)CNaphthalene (10 π electrons)DCyclobutadiene (4 π electrons)

Chemistry

Chemistry · L5 · Quantum Chemistry & Spectroscopy

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Chemistry · L5 · Quantum Chemistry & Spectroscopy

Flashcards12 cards

What does a catalyst do to a reaction, in terms of activation energy and its own fate?1 / 12

A catalyst provides an alternate reaction pathway with a lower activation energy (Ea), so more reactant molecules have enough energy to react at a given temperature. It is regenerated at the end of the mechanism — not consumed overall — even though it may take part in an intermediate step.

Chemistry

Chemistry · L4 · Catalysis & Green Chemistry

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Chemistry · L4 · Catalysis & Green Chemistry

Note~299 words · 1 min

Fermentation: Living Yeast Without Oxygen Yeast is a living microorganism — far too small to see, but very much alive. Most living things need oxygen to release energy from food. Yeast can do something different: when there is no oxygen aro

Chemistry

Chemistry · L2 · Fermentation

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Chemistry · L2 · Fermentation

Flowchart9 objects

Chemistry

Chemistry · L2 · How Soap Is Made — Saponification · flowchart

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Chemistry · L2 · How Soap Is Made — Saponification · flowchart

Note~536 words · 3 min

Two forces, four trends The periodic table isn't just a list of elements — moving across it in either direction changes an atom's properties in predictable ways. Every one of those changes comes down to a tug-of-war between two things: how

Chemistry

Chemistry · L3 · Periodic Trends

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Chemistry · L3 · Periodic Trends

Flowchart7 objects

Chemistry

Chemistry · L3 · Mass ↔ Moles ↔ Particles

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Chemistry · L3 · Mass ↔ Moles ↔ Particles

Note~648 words · 3 min

The 18-Electron Rule A transition-metal organometallic complex tends to be especially stable when its total valence electron count reaches 18 — filling the metal's nine valence orbitals (1 s + 3 p + 5 d), exactly as the octet rule fills 4 o

Chemistry

Chemistry · L5 · Organometallic Catalytic Cycles: The 18-Electron Rule in Action

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Chemistry · L5 · Organometallic Catalytic Cycles: The 18-Electron Rule in Action

Flowchart18 objects

Chemistry

Chemistry · L5 · PET Imaging Detection Principle

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Chemistry · L5 · PET Imaging Detection Principle

Flashcards5 cards

State the LCAO (Linear Combination of Atomic Orbitals) approximation for a diatomic molecule.1 / 5

A molecular orbital ψ is approximated as a linear combination of atomic orbitals χᵢ on each nucleus:

Chemistry

Chemistry · L5 · Quantum Chemistry & MO Theory

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Chemistry · L5 · Quantum Chemistry & MO Theory

Flowchart17 objects

Chemistry

Chemistry · L4 · Solubility Equilibria: Ksp, common ion effect, and precipitation · flowchart

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Chemistry · L4 · Solubility Equilibria: Ksp, common ion effect, and precipitation · flowchart

Flowchart13 objects

Chemistry

Chemistry · L4 · Protein structure levels, bottom-up

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Chemistry · L4 · Protein structure levels, bottom-up

Note~560 words · 3 min

What an oxidation number is An oxidation number (or oxidation state) is a bookkeeping charge assigned to an atom — the charge it would have if every bond to a different element were fully ionic. It isn't always a real, physical charge, but

Chemistry

Chemistry · L3 · Oxidation States & Balancing Redox Equations

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Chemistry · L3 · Oxidation States & Balancing Redox Equations

Flowchart10 objects

Chemistry

Chemistry · L4 · Electroplating setup: which electrode gains mass

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Chemistry · L4 · Electroplating setup: which electrode gains mass

Flashcards12 cards

What is a natural pH indicator?1 / 12

A substance found in nature — usually in a plant — that changes colour depending on whether it touches an acid or a base, instead of being manufactured in a lab like universal indicator.

Chemistry

Chemistry · L2 · Natural pH Indicators

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Chemistry · L2 · Natural pH Indicators

Note~437 words · 2 min

Old Tricks That Still Work Long before anyone knew that bacteria and mould existed, people were already preserving food with salt, vinegar, and sugar. These methods survived for thousands of years simply because they worked — even though no

Chemistry

Chemistry · L2 · The Chemistry of Food Preservation

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Chemistry · L2 · The Chemistry of Food Preservation

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