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Chemistry: explore STEM content (page 15 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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Flowchart18 objects

Chemistry

Chemistry · L4 · Stereochemistry: Chirality, Enantiomers, and R/S Naming · flowchart

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Chemistry · L4 · Stereochemistry: Chirality, Enantiomers, and R/S Naming · flowchart

Collection4 items

01Chemistry · L3 · Chromatography and Rf Values

02Chemistry · L3 · Chromatography and Rf Values

03Chemistry · L3 · Paper Chromatography vs TLC

+1 more

Chemistry

Chemistry · L3 · Chromatography and Rf Values

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Chemistry · L3 · Chromatography and Rf Values

Flashcards12 cards

What color is a dilute aqueous solution of Cu²⁺ (e.g. CuSO₄(aq))?1 / 12

Pale blue. The hydrated copper(II) ion, [Cu(H₂O)₆]²⁺, gives copper sulfate solutions and crystals their familiar blue color — one of the most recognisable transition-metal aqua-ion colors in the lab.

Chemistry

Chemistry · L4 · Transition Metal Chemistry in Solution

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Chemistry · L4 · Transition Metal Chemistry in Solution

Quiz5 questions

What should you do if you find a bottle you don't recognize?

ATaste it to find out what it isBSmell it closelyCAsk a grown-upDPour it down the sink yourself

Chemistry

Chemistry · L1 · Staying Safe with Chemicals

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Chemistry · L1 · Staying Safe with Chemicals

Flashcards10 cards

What is EDTA, and why is it described as a hexadentate ligand?1 / 10

EDTA (ethylenediaminetetraacetic acid) is a chelating ligand with six donor atoms — two nitrogen atoms (from its two amine groups) and four oxygen atoms (from its four carboxylate groups) — all of which can coordinate to a single metal ion at the same time. Because it offers six donor atoms simultaneously, EDTA is hexadentate: it wraps around a metal ion almost completely, like a claw, rather than approaching from just one side.

Chemistry

Chemistry · L4 · EDTA Complexometric Titration

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Chemistry · L4 · EDTA Complexometric Titration

Note~368 words · 2 min

Combustion and Fuels Combustion is the scientific name for burning. It is a chemical reaction between a fuel and oxygen that releases heat and light — and, like all chemical changes, it makes brand-new substances that cannot easily be turne

Chemistry

Chemistry · L2 · Combustion and Fuels

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Chemistry · L2 · Combustion and Fuels

Flashcards11 cards

What does Avogadro's Law state?1 / 11

Equal volumes of any gases, measured at the same temperature and pressure, contain equal numbers of particles (moles) — regardless of what the gas actually is. A litre of hydrogen and a litre of carbon dioxide, at the same temperature and pressure, hold exactly the same number of moles.

Chemistry

Chemistry · L3 · Avogadro's Law and Molar Gas Volume

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Chemistry · L3 · Avogadro's Law and Molar Gas Volume

Quiz6 questions

Why does conventional free-radical polymerization typically give a broad molecular-weight distribution (high PDI)?

ABecause the monomer used is always a mixture of different structuresBBecause initiation and irreversible termination both occur randomly at scattered times throughout the reaction, so chains grow for very different lengths of timeCBecause free-radical polymerization always uses a metal catalyst that broadens PDIDBecause free-radical chains cannot propagate past a fixed maximum length

Chemistry

Chemistry · L5 · Controlled and Living Polymerization — 5 Q

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Chemistry · L5 · Controlled and Living Polymerization — 5 Q

Flowchart7 objects

Chemistry

Chemistry · L1 · Milk Meets Vinegar

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Chemistry · L1 · Milk Meets Vinegar

MoleculeCC(C)Cc1ccc(cc1)C(C)C(=O)O

Chemistry

Chemistry · L5 · Ibuprofen

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Chemistry · L5 · Ibuprofen

Quiz5 questions

Why do microreactors handle strongly exothermic reactions more safely than batch flasks?

ATheir high surface-area-to-volume ratio dissipates heat far faster, preventing thermal runawayBThey operate at lower pressure than batch reactorsCThey use less concentrated reagent solutions by designDThey cannot support exothermic reactions at all

Chemistry

Chemistry · L5 · Flow Chemistry & Continuous Processing

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Chemistry · L5 · Flow Chemistry & Continuous Processing

Flashcards6 cards

What does the Karplus equation relate, in general terms?1 / 6

It relates the vicinal (three-bond, ³J) H–H coupling constant to the dihedral (torsion) angle θ between the two coupled C–H bonds: ³J(θ) = A cos²θ + B cosθ + C, where A, B, C are empirically fit constants. Measuring ³J therefore lets you estimate θ, and so probe 3D geometry rather than just connectivity.

Chemistry

Chemistry · L5 · Karplus Equation & Coupling-Constant Analysis

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Chemistry · L5 · Karplus Equation & Coupling-Constant Analysis

Flowchart13 objects

Chemistry

Chemistry · L2 · What's in the Air?

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Chemistry · L2 · What's in the Air?

Flowchart11 objects

Chemistry

Chemistry · L3 · Transition metals: variable oxidation states and vivid color · flowchart

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Chemistry · L3 · Transition metals: variable oxidation states and vivid color · flowchart

Quiz5 questions

What does molarity (M) measure?

AMoles of solute per litre of solutionBGrams of solute per litre of solventCThe temperature at which a solution boilsDThe total mass of the solution

Chemistry

Chemistry · L3 · Solutions & Molarity — 5 Q

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Chemistry · L3 · Solutions & Molarity — 5 Q

Collection6 items

01Chemistry · L5 · Tg, Tm & Crystallinity

02Chemistry · L5 · Chain Structure → Bulk Properties

03Chemistry · L5 · Glass Transition, Crystallinity & Chain-Structure–Property Control

+3 more

Chemistry

Chemistry · L5 · Polymer Science & Materials Chemistry

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Chemistry · L5 · Polymer Science & Materials Chemistry

MoleculeCC(O)C

Chemistry

Isopropanol / propan-2-ol ((CH₃)₂CHOH)

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Isopropanol / propan-2-ol ((CH₃)₂CHOH)

Flashcards11 cards

What is a 'diagonal relationship' in the periodic table, and where does the best-known example sit?1 / 11

A diagonal relationship is when an element resembles the element one period down and one group to the right more than it resembles other members of its own group. The classic trio sits at the top-left of the table: lithium resembles magnesium, beryllium resembles aluminium, and boron resembles silicon.

Chemistry

Chemistry · L4 · Periodic Anomalies

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Chemistry · L4 · Periodic Anomalies

Quiz5 questions

In the complex [Cu(NH₃)₄]²⁺, what role does each NH₃ molecule play?

AA Lewis acid accepting an electron pair from copperBA Lewis base donating a lone pair to copperCA spectator ion with no bond to copperDA reducing agent that lowers copper's oxidation state

Chemistry

Chemistry · L4 · Coordination Chemistry — 5 Q

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Chemistry · L4 · Coordination Chemistry — 5 Q

Flowchart13 objects

Chemistry

Chemistry · L1 · Testing an Object

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Chemistry · L1 · Testing an Object

Note~801 words · 4 min

Which reactant runs out first? Stoichiometry lets you convert between mass, moles, and mole ratios for a single reactant. Real reactions usually start with TWO reactants measured out independently, and they rarely arrive in exactly the rati

Chemistry

Chemistry · L3 · Limiting Reagents and Percent Yield

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Chemistry · L3 · Limiting Reagents and Percent Yield

Quiz5 questions

A flame test on an unknown white powder produces a lilac flame. Which ion is most likely present?

ASodium, Na⁺BPotassium, K⁺CLithium, Li⁺DCalcium, Ca²⁺

Chemistry

Chemistry · L3 · Flame Tests & Ion Tests — 5 Q

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Chemistry · L3 · Flame Tests & Ion Tests — 5 Q

MoleculeCC(=O)Oc1ccccc1C(=O)O

Chemistry

Chemistry · L3 · Aspirin

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Chemistry · L3 · Aspirin

Collection2 items

01Chemistry · L4 · Atomic Structure & Quantum Numbers

02Chemistry · L4 · Periodicity & Chemical Bonding

Chemistry

Chemistry · L4 · Atomic Structure, Periodicity & Bonding

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Chemistry · L4 · Atomic Structure, Periodicity & Bonding

Flowchart7 objects

Chemistry

Chemistry · L1 · Fizzy or Flat?

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Chemistry · L1 · Fizzy or Flat?

Flowchart7 objects

Chemistry

Chemistry · L1 · Milk and Vinegar Curdling · flowchart

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Chemistry · L1 · Milk and Vinegar Curdling · flowchart

Collection5 items

01Chemistry · L1 · Why Helium Balloons Float Up

02Chemistry · L1 · Why Helium Balloons Float Up

03Chemistry · L1 · Which Way Does a Balloon Go?

+2 more

Chemistry

Chemistry · L1 · Why Helium Balloons Float Up

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Chemistry · L1 · Why Helium Balloons Float Up

Collection10 items

01Chemistry · L3 · Reading reactions in SMILES

02Chemistry · L3 · Reactions at a glance

03Chemistry · L3 · Reactions and Structures — 5 Q

+7 more

Chemistry

Chemistry · L3 · Reactions in SMILES

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Chemistry · L3 · Reactions in SMILES

Note~594 words · 3 min

The oxidation ladder: alcohols → aldehydes/ketones → carboxylic acids Alcohols, aldehydes, ketones, and carboxylic acids are all connected by a single idea: oxidation state at carbon. Climbing the ladder from alcohol to acid means removing

Chemistry

Chemistry · L4 · The oxidation ladder: alcohols → aldehydes/ketones → carboxylic acids

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Chemistry · L4 · The oxidation ladder: alcohols → aldehydes/ketones → carboxylic acids

Quiz6 questions

What is a smell actually made of?

ANothing — smells are just imaginedBTiny, invisible particles floating in the airCA special kind of lightDSound waves

Chemistry

Chemistry · L1 · Where Do Smells Come From?

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Chemistry · L1 · Where Do Smells Come From?

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