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Chemistry

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Chemistry: explore STEM content (page 29 of 47) · openstem

Note~265 words · 1 min

Mixing in the Kitchen Your kitchen is full of mixtures! A mixture is two or more things mixed together, where each part stays itself. Mixtures You Can Still Take Apart Some kitchen mixtures are easy to take apart again, because you can stil

Chemistry

Chemistry · L1 · Mixing in the Kitchen

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Chemistry · L1 · Mixing in the Kitchen

Quiz6 questions

What is a reaction mechanism?

AThe single collision that turns reactants directly into productsBThe sequence of small elementary steps a reaction actually proceeds through, from reactants to productsCAnother name for the balanced overall chemical equationDA list of the four everyday factors that can speed a reaction up

Chemistry

Chemistry · L3 · Reaction Mechanisms and the Rate-Determining Step — 6 Q

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Chemistry · L3 · Reaction Mechanisms and the Rate-Determining Step — 6 Q

Collection4 items

01Chemistry · L2 · Getting Metals from Ores

02Chemistry · L2 · Getting Metals from Ores

03Chemistry · L2 · Three Ways to Extract a Metal

+1 more

Chemistry

Chemistry · L2 · Getting Metals from Ores

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Chemistry · L2 · Getting Metals from Ores

Quiz6 questions

A mass spectrum shows a molecular-ion cluster with M at 100% intensity and M+2 at approximately 33% intensity, with no significant M+4 peak. Which halogen is most likely present?

AFluorineBChlorineCBromineDIodine

Chemistry

Chemistry · L5 · Advanced Mass Spectrometry

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Chemistry · L5 · Advanced Mass Spectrometry

Flowchart12 objects

Chemistry

Chemistry · L2 · Electrolytes and Sports Drinks · flowchart

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Chemistry · L2 · Electrolytes and Sports Drinks · flowchart

Note~301 words · 2 min

One string, one reaction A SMILES string normally names a single molecule. Add a '>' and it names a whole reaction: reactants, then reagents, then products. Nothing else changes — the notation carries the meaning. Here bromomethane meets a

Chemistry

Chemistry · L3 · Reading reactions in SMILES

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Chemistry · L3 · Reading reactions in SMILES

Note~254 words · 1 min

Staying Safe with Chemicals at Home Your home has many bottles and containers. Some hold food. Some hold cleaning chemicals or medicine. Chemicals can help us clean and stay healthy, but some of them can hurt us if we don't use them the rig

Chemistry

Chemistry · L1 · Staying Safe with Chemicals at Home

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Chemistry · L1 · Staying Safe with Chemicals at Home

MoleculeCC(N)C(=O)O

Chemistry

Chemistry · L4 · Alanine — a methyl R group

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Chemistry · L4 · Alanine — a methyl R group

MoleculeCC(=O)O

Chemistry

Acetic acid (CH₃COOH)

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Acetic acid (CH₃COOH)

Flashcards10 cards

Can you see the air around you?1 / 10

No, air is invisible. You cannot see it, but it is all around you, all the time.

Chemistry

Chemistry · L1 · Air, Breathing, and Gases

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Chemistry · L1 · Air, Breathing, and Gases

Collection5 items

01Chemistry · L2 · What Comes Out of a Flame

02Chemistry · L2 · What Comes Out of a Flame

03Chemistry · L2 · Comparing CO₂ Output From Different Fuels

+2 more

Chemistry

Chemistry · L2 · What Comes Out of a Flame

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Chemistry · L2 · What Comes Out of a Flame

Quiz5 questions

Salt is spread on icy roads in winter. Which colligative property is being put to use?

AFreezing point depressionBBoiling point elevationCVapor pressure elevationDNone — this is a chemical reaction, not a colligative property

Chemistry

Chemistry · L3 · Colligative Properties — 5 Q

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Chemistry · L3 · Colligative Properties — 5 Q

Flashcards6 cards

Name this reaction — and say which species is the nucleophile.1 / 6

Nucleophilic substitution (Sₙ2). Hydroxide is the nucleophile; bromide is the leaving group.

Chemistry

Chemistry · L3 · Reactions at a glance

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Chemistry · L3 · Reactions at a glance

Flowchart11 objects

Chemistry

Chemistry · L4 · Which Real Gases Behave Most Ideally?

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Chemistry · L4 · Which Real Gases Behave Most Ideally?

Flashcards12 cards

What are the four quantum numbers that describe an electron in an atom?1 / 12

n (principal — energy level, n = 1, 2, 3, …), l (angular momentum — subshell, 0 to n−1), mₗ (magnetic — orbital orientation, −l to +l), and mₛ (spin — ±½). Together they uniquely identify an electron's state.

Chemistry

Chemistry · L4 · Atomic Structure & Quantum Numbers

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Chemistry · L4 · Atomic Structure & Quantum Numbers

Flowchart13 objects

Chemistry

Chemistry · L2 · Gases in the Air · flowchart

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Chemistry · L2 · Gases in the Air · flowchart

Flashcards5 cards

Contrast SN2 and SN1 mechanisms: kinetics, stereochemistry, and substrate effects.1 / 5

SN2: bimolecular, rate = k[substrate][nucleophile], proceeds via a single concerted back-side attack transition state → complete inversion of configuration (Walden inversion). Favoured by primary substrates and strong nucleophiles in polar aprotic solvents.

Chemistry

Chemistry · L5 · Advanced Organic Mechanisms & Retrosynthesis

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Chemistry · L5 · Advanced Organic Mechanisms & Retrosynthesis

Note~329 words · 2 min

Metal Left Out in the Weather Bike frames, metal fences, garden tools, and playground equipment all spend their lives outside. Rain falls on them, and even when it isn't raining, the air around them often stays damp. Metal kept indoors — li

Chemistry

Chemistry · L1 · Weathering: Why Outdoor Metal Rusts

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Chemistry · L1 · Weathering: Why Outdoor Metal Rusts

Flowchart21 objects

Chemistry

Chemistry · L5 · Competitive ABPP Inhibitor Screening Workflow

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Chemistry · L5 · Competitive ABPP Inhibitor Screening Workflow

Flashcards9 cards

What determines whether a reaction is spontaneous, and why does temperature only matter for two of the four ΔH/ΔS sign combinations?1 / 9

The sign of ΔG = ΔH − TΔS. When ΔH and −TΔS push in the SAME direction for every T (both negative, or both positive), the sign of ΔG never changes — spontaneity is fixed, regardless of temperature. When they push in OPPOSITE directions, the two terms compete, and which one wins depends on how large T is — so spontaneity can flip at some crossover temperature.

Chemistry

Chemistry · L4 · Gibbs Free Energy — Spontaneity Cases & Crossover Temperature

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Chemistry · L4 · Gibbs Free Energy — Spontaneity Cases & Crossover Temperature

Quiz5 questions

Which pair of factors most directly determines the magnitude of a lattice energy, according to the Coulomb's-law-based model?

AIonic charge and ionic radiusBBoiling point and densityCMolar mass and colourDElectronegativity difference alone, with no dependence on size

Chemistry

Chemistry · L4 · Lattice Energy, Born-Lande & Kapustinskii — 5 Q

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Chemistry · L4 · Lattice Energy, Born-Lande & Kapustinskii — 5 Q

Collection4 items

01Chemistry · L4 · Colorimetry & the Beer-Lambert Law

02Chemistry · L4 · Colorimetry and the Beer-Lambert law

03Chemistry · L4 · Beer-Lambert calibration curve

+1 more

Chemistry

Chemistry · L4 · Colorimetry & Beer-Lambert Law

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Chemistry · L4 · Colorimetry & Beer-Lambert Law

Quiz6 questions

A big ship floats, even though it is very heavy. Why?

AIt is not really heavy at allBIts shape traps air, so it is not packed together tightlyCShips cannot sinkDIt is made of wood

Chemistry

Chemistry · L1 · Floating and Sinking

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Chemistry · L1 · Floating and Sinking

MoleculeCCCC

Chemistry

Chemistry · L4 · Butane (C₄H₁₀)

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Chemistry · L4 · Butane (C₄H₁₀)

Flowchart23 objects

Chemistry

Chemistry · L5 · Chain Structure → Tg / Crystallinity → Bulk Property

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Chemistry · L5 · Chain Structure → Tg / Crystallinity → Bulk Property

Note~452 words · 2 min

Inside the atom Every atom is built from three subatomic particles. Protons carry a positive charge and neutrons carry no charge at all — both are packed tightly together in the nucleus, the small, dense centre of the atom. Electrons carry

Chemistry

Chemistry · L3 · Atomic Structure & Electron Shells

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Chemistry · L3 · Atomic Structure & Electron Shells

Flashcards9 cards

What is mechanochemistry?1 / 9

Mechanochemistry is the study and use of mechanical force — grinding, milling, shearing, or ultrasound — to induce chemical reactions, either by driving reactants together without bulk solvent (mechanochemical synthesis) or by directly breaking or forming covalent bonds through applied stress (mechanochemical bond activation), as distinct from thermal or photochemical activation.

Chemistry

Chemistry · L5 · Mechanochemistry

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Chemistry · L5 · Mechanochemistry

Note~583 words · 3 min

Chemistry at the Timescale of a Vibrating Bond A single molecular vibration completes in roughly 10 to 100 femtoseconds (1 fs = 10⁻¹⁵ s) — so to watch atoms actually move as a bond breaks or forms, rather than only comparing the reactant st

Chemistry

Chemistry · L5 · Ultrafast Femtochemistry

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Chemistry · L5 · Ultrafast Femtochemistry

Quiz5 questions

What structural feature does axial chirality arise from, as opposed to point chirality?

AA single tetrahedral stereocenter atom with four different substituentsBA chiral axis, where the spatial arrangement around a restricted-rotation bond is non-superimposable on its mirror image, with no single stereocenter atomCA planar ring system with no rotation at allDA double bond geometry described by E/Z descriptors

Chemistry

Chemistry · L5 · Atropisomerism & Axial Chirality

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Chemistry · L5 · Atropisomerism & Axial Chirality

Quiz5 questions

What role does mechanical impact play in a ball-milling reaction?

AIt fractures particles and continuously exposes fresh, unreacted crystal surfaces to each otherBIt dissolves the reactants into a homogeneous solutionCIt only removes moisture from the reaction mixtureDIt cools the reaction to suppress unwanted side reactions

Chemistry

Chemistry · L5 · Mechanochemistry

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Chemistry · L5 · Mechanochemistry

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