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All fields Software Mathematics Physics Chemistry Biology Engineering Astronomy Environmental Other Chemistry Chemistry groups

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Chemistry

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Chemistry: explore STEM content (page 22 of 47) · openstem

Quiz6 questions

Which of the following is a core assumption of the Langmuir adsorption model?

AThe surface has a fixed number of identical, non-interacting sites, each holding at most one adsorbed moleculeBAdsorbed molecules can stack indefinitely in multiple layersCAdsorption sites interact strongly with their neighbours, favouring clusteringDThe number of available sites increases as pressure increases

Chemistry

Chemistry · L5 · Surface Chemistry and Adsorption

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Chemistry · L5 · Surface Chemistry and Adsorption

Collection4 items

01Chemistry · L3 · Water Hardness

02Chemistry · L3 · Water Hardness

03Chemistry · L3 · Diagnosing and Treating Hard Water

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Chemistry

Chemistry · L3 · Water Hardness

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Chemistry · L3 · Water Hardness

Note~713 words · 4 min

Balancing redox equations by half-reactions, and redox titrations A redox equation can't always be balanced by inspection — especially once polyatomic ions like MnO₄⁻ or Cr₂O₇²⁻ are involved. The half-reaction (ion-electron) method balances

Chemistry

Chemistry · L4 · Balancing redox equations by half-reactions, and redox titrations

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Chemistry · L4 · Balancing redox equations by half-reactions, and redox titrations

Flowchart17 objects

Chemistry

Chemistry · L2 · Fermentation · flowchart

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Chemistry · L2 · Fermentation · flowchart

Collection8 items

01Chemistry · L3 · Addition vs Condensation Polymerization

02Chemistry · L3 · Plastic Recycling Codes

03Chemistry · L3 · Two Ways to Build a Polymer

+5 more

Chemistry

Chemistry · L3 · Polymer Chemistry

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Chemistry · L3 · Polymer Chemistry

Quiz6 questions

What best explains why atomic radius decreases across a period?

AMore protons pull on the same outer shell, drawing it in tighterBA new electron shell is added at each stepCShielding from inner electrons increases sharplyDElectrons begin pairing up and repelling each other more

Chemistry

Chemistry · L3 · Periodic Trends — 6 Q

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Chemistry · L3 · Periodic Trends — 6 Q

Quiz6 questions

What is the key physical difference between the glass transition (Tg) and the melting temperature (Tm) of a polymer?

ATg applies to the crystalline fraction; Tm applies to the whole sampleBTg is a first-order transition with latent heat; Tm has noneCTg marks when amorphous chain segments gain enough mobility for cooperative motion; Tm is the first-order melting of the crystalline fraction onlyDTg and Tm are two names for the same transition

Chemistry

Chemistry · L5 · Polymer Science & Materials Chemistry — 6 Q

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Chemistry · L5 · Polymer Science & Materials Chemistry — 6 Q

Note~231 words · 1 min

Arrhenius Equation The empirical Arrhenius equation describes how the rate constant k depends on temperature T: where A is the pre-exponential (frequency) factor, Eₐ is the activation energy (J mol⁻¹), R = 8.314 J mol⁻¹ K⁻¹ is the gas const

Chemistry

Chemistry · L5 · Chemical Kinetics: Eyring & Arrhenius Equations

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Chemistry · L5 · Chemical Kinetics: Eyring & Arrhenius Equations

Flowchart16 objects

Chemistry

Chemistry · L4 · Colligative Properties (Quantitative) · flowchart

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Chemistry · L4 · Colligative Properties (Quantitative) · flowchart

Collection1 items

01Chemistry · L4 · Stoichiometry — Moles, Equations & Reactions

Chemistry

Chemistry · L4 · Stoichiometry

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Chemistry · L4 · Stoichiometry

Flashcards7 cards

What structural feature distinguishes a thermoplastic from a thermoset?1 / 7

Cross-linking. A thermoplastic's chains are NOT chemically bonded to each other — they're just long, tangled, individual strands held together by weaker intermolecular forces. A thermoset's chains ARE cross-linked: covalent bonds welded between chains during curing lock the whole mass into one giant molecular network.

Chemistry

Chemistry · L4 · Thermoplastics, Thermosets & Elastomers

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Chemistry · L4 · Thermoplastics, Thermosets & Elastomers

Collection4 items

01Chemistry · L5 · Chemiluminescence

02Chemistry · L5 · Chemiluminescence: Light Out With No Light In

03Chemistry · L5 · Luminol Forensic Reaction Pathway

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Chemistry

Chemistry · L5 · Chemiluminescence

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Chemistry · L5 · Chemiluminescence

Flowchart15 objects

Chemistry

Chemistry · L2 · The Fire Triangle

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Chemistry · L2 · The Fire Triangle

Flashcards8 cards

What is atropisomerism?1 / 8

Atropisomerism is a form of stereoisomerism arising from restricted rotation about a single bond — most commonly the C–C bond connecting two aromatic rings in a biaryl — where sufficiently bulky substituents near that bond raise the rotational barrier high enough that the two resulting non-superimposable conformers are configurationally stable and isolable at room temperature, rather than rapidly interconverting.

Chemistry

Chemistry · L5 · Atropisomerism & Axial Chirality

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Chemistry · L5 · Atropisomerism & Axial Chirality

Note~373 words · 2 min

Puffing Up With Bubbles Bread dough and cake batter both start out flat and heavy. But once they come out of the oven, they are light and full of tiny holes. What happened? Tiny bubbles of gas formed inside the dough or batter. As the oven

Chemistry

Chemistry · L1 · Why Bread and Cakes Rise

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Chemistry · L1 · Why Bread and Cakes Rise

Collection4 items

01Chemistry · L5 · Flow Chemistry & Continuous Processing

02Chemistry · L5 · Flow Chemistry and Continuous Processing

03Chemistry · L5 · Telescoped Multistep Flow Synthesis

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Chemistry

Chemistry · L5 · Flow Chemistry & Continuous Processing

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Chemistry · L5 · Flow Chemistry & Continuous Processing

Flowchart7 objects

Chemistry

Chemistry · L1 · Sour or Soapy Taste Test

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Chemistry · L1 · Sour or Soapy Taste Test

Flowchart7 objects

Chemistry

Chemistry · L2 · Conservation of Mass

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Chemistry · L2 · Conservation of Mass

Flowchart15 objects

Chemistry

Chemistry · L3 · Titration Setup & Procedure

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Chemistry · L3 · Titration Setup & Procedure

Quiz5 questions

Which intermolecular force exists between every pair of molecules, even nonpolar ones?

ADipole-dipole forcesBHydrogen bondingCLondon dispersion forcesDIonic bonding

Chemistry

Chemistry · L3 · Intermolecular Forces — 5 Q

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Chemistry · L3 · Intermolecular Forces — 5 Q

Flashcards9 cards

What does the equation q = mcΔT let you calculate, and what does each symbol mean?1 / 9

It calculates q, the heat energy transferred, in joules. m is the mass being heated or cooled, in grams; c is the substance's specific heat capacity, in J/(g·°C) — how much energy it takes to raise 1 g of it by 1 °C; and ΔT is the temperature change, in °C.

Chemistry

Chemistry · L3 · Thermochemistry Basics

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Chemistry · L3 · Thermochemistry Basics

Flowchart15 objects

Chemistry

Chemistry · L3 · Concentration vs Time: Reading the Gradient

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Chemistry · L3 · Concentration vs Time: Reading the Gradient

Collection6 items

01Chemistry · L2 · The Fire Triangle

02Chemistry · L2 · Burning Fuels — Products and Extinguishers

03Chemistry · L2 · Combustion and Fuels

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Chemistry

Chemistry · L2 · Combustion and Fuels

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Chemistry · L2 · Combustion and Fuels

Flashcards5 cards

What happens when you stir sugar into water?1 / 5

The sugar disappears into the water. We say it dissolves. The water tastes sweet.

Chemistry

Chemistry · L1 · Mixing and Dissolving

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Chemistry · L1 · Mixing and Dissolving

Flowchart13 objects

Chemistry

Chemistry · L1 · Why Helium Balloons Float Up · flowchart

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Chemistry · L1 · Why Helium Balloons Float Up · flowchart

Quiz6 questions

Hess's Law is a direct consequence of which property of enthalpy?

AIt is a state function — depends only on the initial and final states, not the pathBIt is an extensive property that scales with the amount of substanceCIt is temperature-independent by definitionDIt only applies to gas-phase reactions

Chemistry

Chemistry · L4 · Hess's Law Calculations — 6 Q

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Chemistry · L4 · Hess's Law Calculations — 6 Q

Flashcards9 cards

How does atomic radius change as you move across a period (left to right), and why?1 / 9

Atomic radius decreases. Moving across a period adds protons to the nucleus one at a time, but the new electrons are added to the SAME outer shell. The extra positive charge pulls that whole electron cloud in tighter, so the atom shrinks.

Chemistry