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

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Search the community's STEM library — free to study, yours to make your own.

Chemistry

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Chemistry: explore STEM content (page 39 of 47) · openstem

Collection6 items

01Chemistry · L3 · Esters — Formation and Uses

02Chemistry · L3 · Esters — Formation and Uses

03Chemistry · L3 · Naming an Ester from Acid + Alcohol

+3 more

Chemistry

Chemistry · L3 · Esters — Formation and Uses

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Chemistry · L3 · Esters — Formation and Uses

Flowchart13 objects

Chemistry

Chemistry · L1 · Yeast Bread vs. Baking-Soda Cake

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Chemistry · L1 · Yeast Bread vs. Baking-Soda Cake

Note~793 words · 4 min

The CuAAC Reaction: A Third Kind of Cycloaddition The copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC) joins an organic azide (R–N₃) and a terminal alkyne (R'–C≡CH) into a 1,2,3-triazole ring. Formally it is a [3+2] cycloaddition — th

Chemistry

Chemistry · L5 · Click Chemistry and Bioorthogonal Labeling

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Chemistry · L5 · Click Chemistry and Bioorthogonal Labeling

Flowchart15 objects

Chemistry

Chemistry · L3 · Buffers — Resisting pH Change · flowchart

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Chemistry · L3 · Buffers — Resisting pH Change · flowchart

Flashcards10 cards

Roughly where does lemon juice sit on the pH scale?1 / 10

Around pH 2 — strongly acidic.

Chemistry

Chemistry · L2 · pH in Everyday Life

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Chemistry · L2 · pH in Everyday Life

Note~708 words · 4 min

Avogadro's Law: Same Volume, Same Number of Moles Boyle's Law and Charles's Law both describe a FIXED amount of gas as its pressure, volume, or temperature changes. Avogadro's Law asks a different question: what happens when you compare two

Chemistry

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

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

Collection4 items

01Chemistry · L4 · Cell Notation and Concentration Cells

02Chemistry · L4 · Cell Notation and Concentration Cells

03Chemistry · L4 · Ion flow direction in a concentration cell

+1 more

Chemistry

Chemistry · L4 · Cell Notation and Concentration Cells

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Chemistry · L4 · Cell Notation and Concentration Cells

Flashcards10 cards

Define the E-factor. What do very high or very low values mean?1 / 10

E-factor = mass of waste / mass of product (kg waste per kg product isolated). An E-factor of 0 is the unreachable ideal — every input atom ends up in the product. A high E-factor means the process generates many kilograms of waste — solvents, byproducts, purification losses — for every kilogram of product actually isolated; the higher the number, the further the real process is from ideal.

Chemistry

Chemistry · L5 · Green Chemistry — Sustainable Catalysis

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Chemistry · L5 · Green Chemistry — Sustainable Catalysis

Note~396 words · 2 min

Thermochemistry: enthalpy, entropy, and free energy Thermochemistry investigates the heat changes that accompany chemical reactions. The three central quantities — enthalpy (H), entropy (S), and Gibbs free energy (G) — together determine wh

Chemistry

Chemistry · L4 · Thermochemistry: enthalpy, entropy, and free energy

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Chemistry · L4 · Thermochemistry: enthalpy, entropy, and free energy

Flashcards6 cards

Write the dilution equation and say what each symbol means.1 / 6

C₁, V₁ are the concentration and volume BEFORE diluting; C₂, V₂ are the concentration and volume AFTER. It works because the moles of solute (C×V) don't change — only the volume of solution around them does.

Chemistry

Chemistry · L3 · Dilution — C₁V₁ = C₂V₂

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Chemistry · L3 · Dilution — C₁V₁ = C₂V₂

Note~576 words · 3 min

What Is an Alloy? An alloy is a mixture of a metal with one or more other elements — often another metal, sometimes a non-metal like carbon. Metals are usually melted and stirred together, then left to cool and solidify as one solid mixture

Chemistry

Chemistry · L2 · Alloys — Mixing Metals for a Purpose

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Chemistry · L2 · Alloys — Mixing Metals for a Purpose

Quiz6 questions

What family does this molecule belong to, and what feature tells you?

AAlkane — only single bondsBAlkene — a C=C double bondCAlcohol — an –OH groupDCarboxylic acid — a –COOH group

Chemistry

Chemistry · L3 · Organic Chemistry: Functional Groups & Naming — 6 Q

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Chemistry · L3 · Organic Chemistry: Functional Groups & Naming — 6 Q

Note~753 words · 4 min

Colligative Properties (Quantitative) The L3 treatment of colligative properties is purely qualitative: dissolved particles 'get in the way' of the solvent, so freezing point drops, boiling point rises, and evaporation slows. That intuition

Chemistry

Chemistry · L4 · Colligative Properties (Quantitative)

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Chemistry · L4 · Colligative Properties (Quantitative)

Flowchart14 objects

Chemistry

Chemistry · L5 · Jablonski Diagram: Photophysical Decay Pathways

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Chemistry · L5 · Jablonski Diagram: Photophysical Decay Pathways

Note~516 words · 3 min

Metalloenzymes: Nature's Small-Molecule Activation Chemistry A handful of metalloenzymes perform reactions — N2 fixation, four-electron water oxidation, selective C–H hydroxylation, reversible H2 cycling — that remain difficult or impossibl

Chemistry

Chemistry · L5 · Bioinorganic Metalloenzymes

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Chemistry · L5 · Bioinorganic Metalloenzymes

Flowchart19 objects

Chemistry

Chemistry · L5 · Doping Silicon: N-Type vs P-Type

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Chemistry · L5 · Doping Silicon: N-Type vs P-Type

Collection4 items

01Chemistry · L1 · Where Do Smells Come From?

02Chemistry · L1 · Where Do Smells Come From?

03Chemistry · L1 · Strong Smell vs Faint Smell

+1 more

Chemistry

Chemistry · L1 · Where Do Smells Come From?

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Chemistry · L1 · Where Do Smells Come From?

Note~627 words · 3 min

Real Gases & the Ideal Gas Law Boyle's law, Charles's law, and Avogadro's law each describe how two of a gas's variables relate while the others are held fixed. Combine all three and you get one master equation that handles any two states o

Chemistry

Chemistry · L4 · Real Gases & the Ideal Gas Law

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Chemistry · L4 · Real Gases & the Ideal Gas Law

Note~191 words · 1 min

Metals and Non-metals Look around you. Some things are metals, like a spoon or a nail. Other things are non-metals, like a rubber band or a wooden pencil. Here is how to tell them apart. Not every metal is magnetic! A magnet sticks to iron

Chemistry

Chemistry · L1 · Metals and Non-metals

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Chemistry · L1 · Metals and Non-metals

Flashcards5 cards

What is a physical change?1 / 5

A physical change alters the shape or state of a substance, but no new substance is formed. Tearing paper and melting ice are physical changes.

Chemistry

Chemistry · L2 · Physical vs Chemical Change

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Chemistry · L2 · Physical vs Chemical Change

MoleculeCc1ccccc1

Chemistry

Chemistry · L4 · Toluene

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Chemistry · L4 · Toluene

Flowchart11 objects

Chemistry

Chemistry · L4 · Is This Carbon a Chiral Centre?

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Chemistry · L4 · Is This Carbon a Chiral Centre?

Quiz6 questions

What most fundamentally distinguishes HPLC and GC from paper or TLC chromatography?

AThey use a detector and a time-based retention time instead of a visible spot and a distance-based Rf valueBThey don't require any kind of stationary phase at allCThey can only separate mixtures of colored substancesDThey detect compounds but cannot actually separate a mixture

Chemistry

Chemistry · L4 · Instrumental Chromatography — HPLC and GC

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Chemistry · L4 · Instrumental Chromatography — HPLC and GC

Flowchart17 objects

Chemistry

Chemistry · L2 · Combustion and Fuels · flowchart

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Chemistry · L2 · Combustion and Fuels · flowchart

Note~726 words · 4 min

Complex-ion formation and its effect on solubility A salt with a tiny Ksp can still be made to dissolve almost completely if something in solution reacts with the metal ion as fast as the salt releases it. That 'something' is usually a liga

Chemistry