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Chemistry: explore STEM content (page 24 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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Quiz5 questions

Which equilibrium expression is correctly written for CaCO3(s) <=> CaO(s) + CO2(g)?

AKc = [CO2]BKc = [CaO][CO2] / [CaCO3]CKc = [CaCO3] / ([CaO][CO2])DKc = [CaO] / [CaCO3]

Chemistry

Chemistry · L4 · Heterogeneous Equilibria & Kp — 5 Q

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Chemistry · L4 · Heterogeneous Equilibria & Kp — 5 Q

Flowchart9 objects

Chemistry

Chemistry · L3 · Boiling Point Elevation

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Chemistry · L3 · Boiling Point Elevation

Collection5 items

01Chemistry · L1 · Air, Breathing, and Gases

02Chemistry · L1 · Air, Breathing, and Gases

03Chemistry · L1 · What Is Air Made Of?

+2 more

Chemistry

Chemistry · L1 · Air, Breathing, and Gases

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Chemistry · L1 · Air, Breathing, and Gases

Flashcards8 cards

Name two natural polymers found in living things.1 / 8

Starch (made by plants) and rubber (from rubber trees) are natural polymers. Wool and silk, made by animals, are natural polymers too.

Chemistry

Chemistry · L2 · Plastics — Useful but Tricky

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Chemistry · L2 · Plastics — Useful but Tricky

Flashcards11 cards

What is a reaction mechanism?1 / 11

The sequence of small, individual collision steps (elementary steps) that a reaction actually proceeds through on the way from reactants to products — as opposed to the overall balanced equation, which only shows the start and end points.

Chemistry

Chemistry · L3 · Reaction Mechanisms and the Rate-Determining Step

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Chemistry · L3 · Reaction Mechanisms and the Rate-Determining Step

Flashcards6 cards

What does it mean to call a property "colligative", and which three properties does that cover?1 / 6

A colligative property depends on HOW MANY particles are dissolved in a solvent — not what those particles are.

Chemistry

Chemistry · L3 · Freezing & Boiling Point Shifts

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Chemistry · L3 · Freezing & Boiling Point Shifts

MoleculeCCC(C)O

Chemistry

Chemistry · L4 · 2-Butanol

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Chemistry · L4 · 2-Butanol

Flowchart11 objects

Chemistry

Chemistry · L5 · Hückel MO Energy Diagram for Benzene

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Chemistry · L5 · Hückel MO Energy Diagram for Benzene

Note~595 words · 3 min

Common Polyatomic Ions and Their Charges A polyatomic ion is a small group of atoms bonded together that carries one overall charge and behaves as a single unit when building a formula — it gets crossed, subscripted, and bracketed exactly l

Chemistry

Chemistry · L3 · Naming and Writing Ionic Formulae

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Chemistry · L3 · Naming and Writing Ionic Formulae

Note~229 words · 1 min

Evaporation and Condensation After it rains, a puddle sits on the sidewalk. A few hours later on a sunny day, it is gone. Where did all that water go? Evaporation: Liquid Water Becomes Invisible Vapor The sun warms the puddle, and slowly th

Chemistry

Chemistry · L1 · Evaporation and Condensation

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Chemistry · L1 · Evaporation and Condensation

Flowchart23 objects

Chemistry

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

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

Flowchart9 objects

Chemistry

Chemistry · L3 · Specific Latent Heat · flowchart

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Chemistry · L3 · Specific Latent Heat · flowchart

Collection3 items

01Chemistry · L4 · Balancing Redox Equations & Redox Titrations

02Chemistry · L4 · Balancing redox equations by half-reactions, and redox titrations

03Chemistry · L4 · Balancing Redox Equations & Redox Titrations — 5 Q

Chemistry

Chemistry · L4 · Redox Titrations & Balancing

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Chemistry · L4 · Redox Titrations & Balancing

Flowchart13 objects

Chemistry

Chemistry · L1 · Staying Safe with Chemicals at Home · flowchart

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Chemistry · L1 · Staying Safe with Chemicals at Home · flowchart

Flashcards12 cards

What is a quantum dot?1 / 12

A semiconductor nanoparticle, typically only a few nanometers across, small enough that quantum confinement effects dominate its electronic behavior — unlike a bulk crystal of the same material, where those effects are negligible.

Chemistry

Chemistry · L5 · Nanomaterials and Quantum Confinement

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Chemistry · L5 · Nanomaterials and Quantum Confinement

Note~348 words · 2 min

Crystals and Crystallization A crystal is a solid whose particles are arranged in a regular, repeating pattern. That pattern repeats over and over in every direction, like a tiny, perfectly ordered stack of building blocks. Because the patt

Chemistry

Chemistry · L2 · Crystals and Crystallization

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Chemistry · L2 · Crystals and Crystallization

Flashcards7 cards

What is the pH scale?1 / 7

A number line from 0 to 14 that measures how acidic or basic (alkaline) a substance is.

Chemistry

Chemistry · L2 · The pH Scale

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Chemistry · L2 · The pH Scale

Quiz5 questions

What two products does complete combustion of a hydrocarbon fuel produce in plenty of oxygen?

ACarbon dioxide and waterBCarbon monoxide and sootCHydrogen and oxygenDA shorter alkane and an alkene

Chemistry

Chemistry · L3 · Combustion and Cracking of Hydrocarbons — 5 Q

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Chemistry · L3 · Combustion and Cracking of Hydrocarbons — 5 Q

Flowchart13 objects

Chemistry

Chemistry · L3 · What Esters Are Used For

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Chemistry · L3 · What Esters Are Used For

Flowchart7 objects

Chemistry

Chemistry · L4 · Catalytic converter: heterogeneous catalysis in action

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Chemistry · L4 · Catalytic converter: heterogeneous catalysis in action

Flowchart9 objects

Chemistry

Chemistry · L2 · Crystallization as a Separation Technique

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Chemistry · L2 · Crystallization as a Separation Technique

Flowchart10 objects

Chemistry

Chemistry · L4 · How electroplating works (an electrolytic cell)

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Chemistry · L4 · How electroplating works (an electrolytic cell)

Collection4 items

01Chemistry · L4 · EDTA Complexometric Titration

02Chemistry · L4 · EDTA Complexometric Titration

03Chemistry · L4 · EDTA's six donor atoms wrapping a single metal ion

+1 more

Chemistry

Chemistry · L4 · EDTA Complexometric Titration

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Chemistry · L4 · EDTA Complexometric Titration

Flashcards10 cards

State Hess's Law, and explain WHY it works in terms of a fundamental property of enthalpy.1 / 10

Hess's Law: if a reaction can be written as the sum of two or more steps, its overall ΔH equals the sum of the ΔH values of those steps, however the steps are combined. It works because enthalpy is a STATE FUNCTION — ΔH depends only on the initial and final states of a system, not on the path taken between them. Any route from the same reactants to the same products, no matter how many intermediate steps, must add up to the same total ΔH.

Chemistry

Chemistry · L4 · Hess's Law Calculations

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Chemistry · L4 · Hess's Law Calculations

Quiz5 questions

What happens to the temperature of the surroundings in an exothermic reaction?

AIt increases — energy is releasedBIt decreases — energy is absorbedCIt stays exactly the sameDIt cannot be predicted

Chemistry

Chemistry · L2 · Energy in Chemical Reactions

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Chemistry · L2 · Energy in Chemical Reactions

Flowchart7 objects

Chemistry

Chemistry · L1 · Mixtures vs. Solutions · flowchart

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Chemistry · L1 · Mixtures vs. Solutions · flowchart

Flowchart15 objects

Chemistry

Chemistry · L4 · Why Real Gases Deviate from Ideal

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Chemistry · L4 · Why Real Gases Deviate from Ideal

Flowchart8 objects

Chemistry

Chemistry · L1 · Where Does a Puddle Go?

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Chemistry · L1 · Where Does a Puddle Go?

Collection6 items

01Chemistry · L4 · Thermoplastics, Thermosets & Elastomers

02Chemistry · L4 · Polymer Molecular Weight & Polydispersity

03Chemistry · L4 · Classifying Polymers by Thermal & Mechanical Behavior

+3 more

Chemistry

Chemistry · L4 · Polymer Chemistry

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Chemistry · L4 · Polymer Chemistry

Note~542 words · 3 min

How Soap Is Made You already know that a soap molecule has two ends — one that loves water and one that loves grease — and that this is what lets soap wash grease away. But where does that molecule actually come from? Soap is not dug up or

Chemistry

Chemistry · L2 · How Soap Is Made — Saponification

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Chemistry · L2 · How Soap Is Made — Saponification

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