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Chemistry: explore STEM content (page 27 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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Flowchart16 objects

Chemistry

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

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

Quiz5 questions

Diamond and quartz are both classified as which type of crystalline solid?

AIonicBMolecularCCovalent networkDMetallic

Chemistry

Chemistry · L4 · Solid State Chemistry & Crystal Structures — 5 Q

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Chemistry · L4 · Solid State Chemistry & Crystal Structures — 5 Q

MoleculeC

Chemistry

Chemistry · L3 · Methane (CH₄)

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Chemistry · L3 · Methane (CH₄)

Flowchart25 objects

Chemistry

Chemistry · L2 · Hazard Symbol Categories

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Chemistry · L2 · Hazard Symbol Categories

Flowchart9 objects

Chemistry

Chemistry · L2 · Protecting Metal Structures · flowchart

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Chemistry · L2 · Protecting Metal Structures · flowchart

Flowchart11 objects

Chemistry

Chemistry · L3 · Naming and Writing Ionic Formulae · flowchart

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Chemistry · L3 · Naming and Writing Ionic Formulae · flowchart

Flowchart10 objects

Chemistry

Chemistry · L3 · OIL RIG — Tracing Electron Transfer

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Chemistry · L3 · OIL RIG — Tracing Electron Transfer

Flowchart14 objects

Chemistry

Chemistry · L5 · Total Synthesis Strategy · flowchart

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Chemistry · L5 · Total Synthesis Strategy · flowchart

Flowchart9 objects

Chemistry

Chemistry · L4 · Choosing a technique: what question are you asking?

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Chemistry · L4 · Choosing a technique: what question are you asking?

Note~419 words · 2 min

Energy Stored in Chemical Bonds You already know that an exothermic reaction releases energy and warms its surroundings, while an endothermic reaction absorbs energy and cools its surroundings. But where does that energy actually come from,

Chemistry

Chemistry · L2 · Energy Stored in Chemical Bonds

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Chemistry · L2 · Energy Stored in Chemical Bonds

Flowchart13 objects

Chemistry

Chemistry · L4 · Blast Furnace and Electrolytic Refining · flowchart

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Chemistry · L4 · Blast Furnace and Electrolytic Refining · flowchart

Plot1 plot

Chemistry

Chemistry · L5 · Electron-transfer rate vs driving force (the Marcus curve)

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Chemistry · L5 · Electron-transfer rate vs driving force (the Marcus curve)

Collection5 items

01Chemistry · L3 · Nuclear Chemistry

02Chemistry · L3 · Nuclear Chemistry

03Chemistry · L3 · Half-Life Decay Staircase

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Chemistry

Chemistry · L3 · Nuclear Chemistry

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Chemistry · L3 · Nuclear Chemistry

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Chemistry

Chemistry · L5 · Green solvent selection cascade

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Chemistry · L5 · Green solvent selection cascade

Flashcards10 cards

What is the van't Hoff factor i, and why does it appear in every colligative-property equation?1 / 10

i is the number of dissociated particles one formula unit of solute produces in solution. Colligative properties depend on total particle count, not solute identity, so every equation multiplies the 'per-mole' effect by i to account for solutes that split into multiple ions. Nonelectrolytes (glucose, sucrose, urea) have i = 1 — they don't dissociate.

Chemistry

Chemistry · L4 · Freezing Point Depression & Boiling Point Elevation

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Chemistry · L4 · Freezing Point Depression & Boiling Point Elevation

Quiz5 questions

Why is the Haber process run at ~450°C instead of a lower temperature, which would favour a higher equilibrium yield of ammonia?

AA lower temperature would make the reaction too slow to be economicalBA lower temperature would shift the equilibrium toward the reactantsCThe iron catalyst only works above 450°CDAmmonia decomposes below 450°C

Chemistry

Chemistry · L3 · Industrial Equilibrium — Haber and Contact Processes — 5 Q

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Chemistry · L3 · Industrial Equilibrium — Haber and Contact Processes — 5 Q

Note~238 words · 1 min

Dissolving vs. Melting Stir sugar into warm tea and it seems to vanish. Leave an ice cube on the counter and it also seems to vanish. But these two things are not the same at all. Melting Is About Heat Melting happens when a solid gets warm

Chemistry

Chemistry · L1 · Dissolving vs. Melting

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Chemistry · L1 · Dissolving vs. Melting

Collection5 items

01Chemistry · L3 · Gas Laws

02Chemistry · L3 · Gas Laws

03Chemistry · L3 · Which Gas Law Do I Use?

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Chemistry

Chemistry · L3 · Gas Laws

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Chemistry · L3 · Gas Laws

Flashcards10 cards

What is retrosynthetic analysis, and which direction does its disconnection arrow (⇒) point?1 / 10

Retrosynthetic analysis works BACKWARDS from a target molecule toward simpler, ideally commercially available starting materials, by mentally breaking (disconnecting) bonds one at a time. The disconnection arrow ⇒ points from the more complex target to the simpler precursor(s) — the opposite direction from an actual forward reaction arrow (→), which is why the same route is drawn once backwards (planning) and once forwards (the real synthesis).

Chemistry

Chemistry · L4 · Organic Synthesis Routes & Retrosynthetic Analysis

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Chemistry · L4 · Organic Synthesis Routes & Retrosynthetic Analysis

Flowchart9 objects

Chemistry

Chemistry · L5 · Basis Set Size vs Accuracy and Cost

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Chemistry · L5 · Basis Set Size vs Accuracy and Cost

Collection4 items

01Chemistry · L4 · Acid-Base Titration Curves & Indicator Selection

02Chemistry · L4 · Titration curve shapes, the half-equivalence point, and indicator selection

03Chemistry · L4 · Strong Acid-Strong Base Titration Curve

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Chemistry

Chemistry · L4 · Acid-Base Titration Curves & Indicators

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Chemistry · L4 · Acid-Base Titration Curves & Indicators

Flashcards8 cards

What is the lanthanide contraction, and what causes it?1 / 8

The lanthanide contraction is the steady, cumulative decrease in ionic radius across the lanthanide series (La³⁺ to Lu³⁺) as the 4f subshell fills. Each added 4f electron shields the increasing nuclear charge poorly (4f orbitals have a diffuse, multi-lobed shape with significant electron density near the nucleus and poor mutual shielding), so the effective nuclear charge felt by the outer electrons rises steadily across the series, pulling the ion's outer shell inward and shrinking its radius.

Chemistry

Chemistry · L5 · Lanthanide & Actinide Chemistry

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Chemistry · L5 · Lanthanide & Actinide Chemistry

Flashcards12 cards

What is soap traditionally made from?1 / 12

A fat or oil — such as animal fat, olive oil, or coconut oil — heated together with a strong base called lye (sodium hydroxide, NaOH).

Chemistry

Chemistry · L2 · How Soap Is Made — Saponification

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Chemistry · L2 · How Soap Is Made — Saponification

Flowchart13 objects

Chemistry

Chemistry · L4 · Brønsted-Lowry as a subset of Lewis acid-base theory

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Chemistry · L4 · Brønsted-Lowry as a subset of Lewis acid-base theory

Quiz5 questions

For a titration of a weak acid with a strong base, why does the equivalence point occur above pH 7?

ABecause the only species present at equivalence is the conjugate base of the weak acid, which hydrolyses water to produce OH-BBecause strong bases always produce a pH above 10 regardless of the acidCBecause the indicator used shifts the true equivalence pointDIt does not — the equivalence point is always exactly pH 7 for any acid-base titration

Chemistry

Chemistry · L4 · Titration Curves & Indicators — 5 Q

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Chemistry · L4 · Titration Curves & Indicators — 5 Q

Flashcards10 cards

What does VSEPR theory say determines a molecule's shape?1 / 10

The electron pairs (bonding pairs AND lone pairs) around a central atom repel each other and arrange themselves to be as far apart as possible. The resulting positions of the ATOMS give the molecular shape.

Chemistry

Chemistry · L3 · VSEPR shapes

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Chemistry · L3 · VSEPR shapes

Note~345 words · 2 min

Reversible reactions reach a moving balance Most reactions you meet early on run one way and stop. A reversible reaction, written with a ⇌ instead of a →, can run in BOTH directions at once under the same conditions: reactants turn into pro

Chemistry

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

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

Note~416 words · 2 min

Metals and Reactivity Not all metals behave the same way. Some, like potassium and sodium, react so fast and so strongly that they must be stored under oil for safety. Others, like gold and platinum, barely react with anything at all — whic

Chemistry

Chemistry · L2 · Metals and Reactivity

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Chemistry · L2 · Metals and Reactivity

Flowchart7 objects

Chemistry

Chemistry · L1 · Heating and Cooling Water

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Chemistry · L1 · Heating and Cooling Water

Flashcards11 cards

What is a mole, and what is Avogadro's number?1 / 11

One mole is the amount of substance containing exactly 6.022 × 10²³ (Avogadro's number, Nₐ) elementary entities (atoms, molecules, ions). It links macroscopic mass to the atomic scale: 1 mol of ¹²C = 12.000 g.

Chemistry

Chemistry · L4 · Stoichiometry — Moles, Equations & Reactions

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Chemistry · L4 · Stoichiometry — Moles, Equations & Reactions

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