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Chemistry: explore STEM content (page 46 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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Quiz5 questions

Which loss regime dominates a fuel cell's polarization curve at very low current density?

AMass-transport (concentration) lossesBActivation (kinetic) losses, reflecting sluggish electrode reaction kineticsCOhmic (resistive) lossesDNo losses occur at low current density

Chemistry

Chemistry · L5 · Electrocatalysis & Fuel Cells

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Chemistry · L5 · Electrocatalysis & Fuel Cells

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Chemistry

Chemistry · L1 · Where Do Smells Come From? · flowchart

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Chemistry · L1 · Where Do Smells Come From? · flowchart

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Chemistry

Chemistry · L3 · Squeezing a Gas

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Chemistry · L3 · Squeezing a Gas

Flashcards9 cards

What is a radical clock, and how is it used to measure the rate of an extremely fast radical process?1 / 9

A radical clock is a substrate containing a very fast, well-calibrated unimolecular radical rearrangement (classically the ring-opening of a cyclopropylcarbinyl radical, with a known rate constant on the order of 10⁸ s⁻¹) competing against a bimolecular reaction with an external trapping reagent whose concentration is known. By measuring the ratio of rearranged to unrearranged product as a function of trap concentration, the absolute rate constant of the bimolecular reaction can be calculated relative to the clock's known unimolecular rate — letting chemists measure radical reaction rates far too fast to time directly by any spectroscopic method.

Chemistry

Chemistry · L5 · Advanced Radical Chemistry

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Chemistry · L5 · Advanced Radical Chemistry

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Chemistry

Chemistry · L5 · Boltzmann Populations: Low T vs High T

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Chemistry · L5 · Boltzmann Populations: Low T vs High T

Note~216 words · 1 min

Milk and Vinegar Curdling Pour a glass of milk and it looks smooth and even. Now add just a small splash of vinegar and stir. Watch closely — something surprising happens. From Smooth to Lumpy Within a minute or two, the milk stops looking

Chemistry

Chemistry · L1 · Milk and Vinegar Curdling

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Chemistry · L1 · Milk and Vinegar Curdling

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Chemistry

Chemistry · L3 · Intermolecular Forces and Boiling Point

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Chemistry · L3 · Intermolecular Forces and Boiling Point

Flashcards7 cards

Why do we keep milk in the fridge?1 / 7

The cold keeps milk fresh for longer. Without the fridge, milk would spoil much faster.

Chemistry

Chemistry · L1 · Fridges, Freezers, and Staying Safe

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Chemistry · L1 · Fridges, Freezers, and Staying Safe

Quiz6 questions

Which general word equation describes neutralization?

Ametal + acid → salt + hydrogenBacid + base → salt + waterCacid + metal carbonate → salt + water + carbon dioxideDsalt + water → acid + base

Chemistry

Chemistry · L2 · Making Salts

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Chemistry · L2 · Making Salts

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Chemistry

Chemistry · L5 · Luminol Forensic Reaction Pathway

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Chemistry · L5 · Luminol Forensic Reaction Pathway

MoleculeN#N

Chemistry

Chemistry · L2 · Nitrogen (N₂)

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Chemistry · L2 · Nitrogen (N₂)

Collection5 items

01Chemistry · L5 · Carbene Chemistry

02Chemistry · L5 · Carbene Chemistry

03Chemistry · L5 · Metal-Catalyzed Diazo Decomposition to a Carbenoid

+2 more

Chemistry

Chemistry · L5 · Carbene Chemistry

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Chemistry · L5 · Carbene Chemistry

Collection3 items

01Chemistry · L5 · Spectroelectrochemistry

02Chemistry · L5 · Spectroelectrochemistry: Watching Electron Transfer Happen

03Chemistry · L5 · Spectroelectrochemistry

Chemistry

Chemistry · L5 · Spectroelectrochemistry

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Chemistry · L5 · Spectroelectrochemistry

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Chemistry

Chemistry · L3 · Redox Reactions & Electrochemistry · flowchart

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Chemistry · L3 · Redox Reactions & Electrochemistry · flowchart

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Chemistry

Chemistry · L1 · Weathering: Why Outdoor Metal Rusts · flowchart

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Chemistry · L1 · Weathering: Why Outdoor Metal Rusts · flowchart

Note~472 words · 2 min

Building Porous Crystals by Design A metal-organic framework assembles two kinds of well-defined molecular building blocks — metal-oxo clusters called secondary building units (SBUs) and multitopic organic linkers — into an extended, crysta

Chemistry

Chemistry · L5 · Metal-Organic Frameworks

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Chemistry · L5 · Metal-Organic Frameworks

Note~789 words · 4 min

The Goal: Approximating the Schrödinger Equation A molecule's structure, energy, and most other properties are, in principle, all contained in the solution to its electronic Schrödinger equation: This equation can be solved exactly only for

Chemistry

Chemistry · L5 · Computational Chemistry & DFT Basics

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Chemistry · L5 · Computational Chemistry & DFT Basics

Flowchart9 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

Collection5 items

01Chemistry · L3 · Chemical Equilibrium & Le Chatelier's Principle

02Chemistry · L3 · Chemical Equilibrium & Le Chatelier's Principle

03Chemistry · L3 · Reaching dynamic equilibrium

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Chemistry

Chemistry · L3 · Chemical Equilibrium & Le Chatelier

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Chemistry · L3 · Chemical Equilibrium & Le Chatelier

MoleculeCCO

Chemistry

Chemistry · L2 · Ethanol (C₂H₅OH)

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Chemistry · L2 · Ethanol (C₂H₅OH)

Flashcards6 cards

What does molarity (M) measure?1 / 6

The concentration of a solution — how many moles of solute are dissolved per litre of solution. Its unit, mol/L, is written M for short.

Chemistry

Chemistry · L3 · Molarity Basics

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Chemistry · L3 · Molarity Basics

Flowchart31 objects

Chemistry

Chemistry · L4 · Systematic Qualitative Inorganic Analysis · flowchart

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Chemistry · L4 · Systematic Qualitative Inorganic Analysis · flowchart

Flowchart15 objects

Chemistry

Chemistry · L4 · Real Gases & the Ideal Gas Law · flowchart

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Chemistry · L4 · Real Gases & the Ideal Gas Law · flowchart

Flowchart13 objects

Chemistry

Chemistry · L3 · Flame Test Procedure

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Chemistry · L3 · Flame Test Procedure

Flowchart11 objects

Chemistry

Chemistry · L2 · How to Grow a Crystal

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Chemistry · L2 · How to Grow a Crystal

Collection4 items

01Chemistry · L3 · Acid Rain

02Chemistry · L3 · Acid Rain

03Chemistry · L3 · Cutting Acid Rain at the Source

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Chemistry

Chemistry · L3 · Acid Rain

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Chemistry · L3 · Acid Rain

Collection6 items

01Chemistry · L4 · Nuclear Chemistry: The Decay Law, Mass Defect & Binding Energy

02Chemistry · L4 · Nuclear Chemistry — The Decay Law & Radiometric Dating

03Chemistry · L4 · Nuclear Chemistry — Mass Defect & Binding Energy

+3 more

Chemistry

Chemistry · L4 · Nuclear Chemistry

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Chemistry · L4 · Nuclear Chemistry

Flashcards12 cards

What is photosynthesis?1 / 12

The process plants use to make their own food. Using energy from sunlight, a plant combines carbon dioxide and water to produce glucose (a sugar) and releases oxygen as a byproduct.

Chemistry

Chemistry · L2 · The Carbon Cycle

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Chemistry · L2 · The Carbon Cycle

MoleculeClCl

Chemistry

Chemistry · L2 · Chlorine (Cl₂)

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Chemistry · L2 · Chlorine (Cl₂)

Quiz6 questions

What is the purpose of the screening step at a water treatment plant?

ATo kill bacteria and other pathogensBTo remove large debris like leaves and litterCTo let heavy particles settle to the bottomDTo trap fine particles in sand and gravel

Chemistry

Chemistry · L2 · Treating Water for Drinking

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Chemistry · L2 · Treating Water for Drinking

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