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Chemistry: explore STEM content (page 20 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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Flowchart7 objects

Chemistry

Chemistry · L1 · Why Salt Melts Sidewalk Ice Faster · flowchart

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Chemistry · L1 · Why Salt Melts Sidewalk Ice Faster · flowchart

Flowchart9 objects

Chemistry

Chemistry · L3 · Using a Mole Ratio

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Chemistry · L3 · Using a Mole Ratio

Flashcards11 cards

HDPE and LDPE are both made from the same monomer, ethene. Why is HDPE rigid while LDPE is flexible?1 / 11

HDPE has long, mostly straight chains that pack tightly and tangle, resisting sliding — rigid and strong. LDPE has shorter, highly branched chains that pack loosely and slide past each other easily — soft and flexible.

Chemistry

Chemistry · L3 · Polymer Structure and Properties

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Chemistry · L3 · Polymer Structure and Properties

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Chemistry

Chemistry · L5 · Enzyme Kinetics · flowchart

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Chemistry · L5 · Enzyme Kinetics · flowchart

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Chemistry

Chemistry · L1 · How a Nail Rusts

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Chemistry · L1 · How a Nail Rusts

Flowchart13 objects

Chemistry

Chemistry · L4 · Alcohol oxidation ladder: primary vs secondary vs tertiary

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Chemistry · L4 · Alcohol oxidation ladder: primary vs secondary vs tertiary

Quiz6 questions

Given E°(Ag⁺/Ag) = +0.80 V and E°(Zn²⁺/Zn) = −0.76 V, what is E°cell for the spontaneous cell built from this pair?

A+1.56 VB+0.04 VC−1.56 VD+0.80 V

Chemistry

Chemistry · L4 · Electrochemistry — 6 Q

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Chemistry · L4 · Electrochemistry — 6 Q

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Chemistry

Chemistry · L3 · Esters — Formation and Uses · flowchart

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Chemistry · L3 · Esters — Formation and Uses · flowchart

Note~491 words · 2 min

One Excitation, Two New Redox Powers A ground-state Ru(bpy)₃²⁺ or Ir(ppy)₃ complex is a modest, often kinetically sluggish, redox partner. Absorbing visible light promotes an electron from a metal-centered orbital into a ligand π* orbital —

Chemistry

Chemistry · L5 · Photoredox Catalysis

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Chemistry · L5 · Photoredox Catalysis

Quiz6 questions

Which gas turns clear limewater cloudy?

AOxygenBCarbon dioxideCCarbon monoxideDNitrogen

Chemistry

Chemistry · L2 · What Comes Out of a Flame

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Chemistry · L2 · What Comes Out of a Flame

Flashcards7 cards

What physically happens to a polymer's chains at the glass transition temperature Tg?1 / 7

Below Tg, chains are effectively frozen — only small-scale vibrational and local bond motion is possible, not large-scale segmental motion, so the bulk material is a rigid glass. At and above Tg, the free volume between chains grows enough that cooperative segmental motion becomes accessible: chain segments can wiggle past one another, and the material turns rubbery or leathery.

Chemistry

Chemistry · L5 · Tg, Tm & Crystallinity

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Chemistry · L5 · Tg, Tm & Crystallinity

Flashcards10 cards

Is air a single substance or a mixture?1 / 10

Air is a mixture of several different gases, not a single substance. The main ones are nitrogen, oxygen, argon, and carbon dioxide.

Chemistry

Chemistry · L2 · Gases in the Air

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Chemistry · L2 · Gases in the Air

MoleculeCCCO

Chemistry

Chemistry · L4 · 1-Propanol (C₃H₇OH)

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Chemistry · L4 · 1-Propanol (C₃H₇OH)

Flowchart16 objects

Chemistry

Chemistry · L5 · Mechanochemistry · flowchart

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Chemistry · L5 · Mechanochemistry · flowchart

Collection6 items

01Chemistry · L2 · Chemical Reactions & Word Equations

02Chemistry · L2 · Conservation of Mass

03Chemistry · L2 · Chemical Reactions & Word Equations

+3 more

Chemistry

Chemistry · L2 · Chemical Reactions & Word Equations

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Chemistry · L2 · Chemical Reactions & Word Equations

Note~1029 words · 5 min

Surface Chemistry and Adsorption: the Langmuir Isotherm You've already met several heterogeneous catalysts — iron in the Haber process, vanadium(V) oxide in the Contact process, and the platinum, palladium and rhodium of a catalytic convert

Chemistry

Chemistry · L5 · Surface Chemistry and Adsorption

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Chemistry · L5 · Surface Chemistry and Adsorption

Quiz5 questions

What does the 'equivalence point' of an acid–base titration mean?

AThe point where the indicator first changes colour, whatever the pHBThe point where moles of acid added exactly equal moles of base addedCThe point where the solution's temperature stops changingDThe point where the burette is exactly half empty

Chemistry

Chemistry · L3 · Acid–Base Titration — 5 Q

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Chemistry · L3 · Acid–Base Titration — 5 Q

Flowchart9 objects

Chemistry

Chemistry · L2 · Crystals and Crystallization · flowchart

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Chemistry · L2 · Crystals and Crystallization · flowchart

Quiz5 questions

Why do people spread salt on icy roads and sidewalks in winter?

ATo make the ice taste betterBTo make it much harder for the water to stay frozen, turning ice into safer slushCTo make the ice look prettierDTo make the ice freeze even harder

Chemistry

Chemistry · L1 · Why Salt Melts Icy Roads

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Chemistry · L1 · Why Salt Melts Icy Roads

Flowchart17 objects

Chemistry

Chemistry · L1 · Natural or Human-made?

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Chemistry · L1 · Natural or Human-made?

Collection4 items

01Chemistry · L2 · Treating Water for Drinking

02Chemistry · L2 · Treating Water for Drinking

03Chemistry · L2 · Why Water Treatment Needs Four Steps

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Chemistry

Chemistry · L2 · Treating Water for Drinking

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Chemistry · L2 · Treating Water for Drinking

Flowchart11 objects

Chemistry

Chemistry · L4 · How spectroscopy works: energy in, signal out

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Chemistry · L4 · How spectroscopy works: energy in, signal out

Quiz6 questions

What type of reaction is esterification — an alcohol and a carboxylic acid combining to form an ester and water?

ANeutralizationBCondensationCCombustionDDisplacement

Chemistry

Chemistry · L3 · Esters — Formation and Uses — 6 Q

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Chemistry · L3 · Esters — Formation and Uses — 6 Q

Moleculec1ccccc1

Chemistry

Chemistry · L3 · Benzene

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Chemistry · L3 · Benzene

Flowchart11 objects

Chemistry

Chemistry · L2 · How a Solution Forms

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Chemistry · L2 · How a Solution Forms

Note~848 words · 4 min

Green chemistry — sustainable catalysis Atom economy tells you what a reaction could achieve on paper, from the balanced equation alone, before a single flask is ever run. The E-factor tells you what a process actually achieves — and the ga

Chemistry