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Chemistry: explore STEM content (page 18 of 47) · openstem

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

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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.

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Note~818 words · 4 min

Blast Furnace and Electrolytic Refining The general rule is already familiar: an unreactive metal like gold is found native, a moderately reactive metal like iron is extracted by reduction with carbon, and a highly reactive metal like alumi

Chemistry

Chemistry · L4 · Blast Furnace and Electrolytic Refining

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Chemistry · L4 · Blast Furnace and Electrolytic Refining

Flowchart13 objects

Chemistry

Chemistry · L2 · The pH Scale · flowchart

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Chemistry · L2 · The pH Scale · flowchart

Flowchart15 objects

Chemistry

Chemistry · L5 · Fuel Cell Polarization Curve Loss Regimes

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Chemistry · L5 · Fuel Cell Polarization Curve Loss Regimes

Flowchart13 objects

Chemistry

Chemistry · L3 · Two Ways to Build a Polymer · flowchart

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Chemistry · L3 · Two Ways to Build a Polymer · flowchart

Quiz5 questions

A current of 2.00 A is passed through a solution containing Cu²⁺ ions for 1000 s. How many moles of electrons are transferred? (F = 96 485 C/mol)

A0.0207 molB0.0414 molC0.0104 molD20.7 mol

Chemistry

Chemistry · L4 · Faraday's Laws of Electrolysis — 5 Q

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Chemistry · L4 · Faraday's Laws of Electrolysis — 5 Q

Note~727 words · 4 min

Heterogeneous equilibria: multiple phases, one equilibrium constant Every equilibrium studied so far in aqueous acid-base and solubility chemistry has involved species dissolved in the same solution — a homogeneous equilibrium. Many importa

Chemistry

Chemistry · L4 · Heterogeneous equilibria: omitted phases, Kp, and the Kp–Kc relationship

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Chemistry · L4 · Heterogeneous equilibria: omitted phases, Kp, and the Kp–Kc relationship

Collection6 items

01Chemistry · L2 · Exothermic Reactions

02Chemistry · L2 · Endothermic Reactions & Spotting the Difference

03Chemistry · L2 · Energy in Chemical Reactions

+3 more

Chemistry

Chemistry · L2 · Energy in Chemical Reactions

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Chemistry · L2 · Energy in Chemical Reactions

Quiz6 questions

Which of these is a chemical change?

AMelting an ice cubeBTearing paperCToasting breadDFolding a towel

Chemistry

Chemistry · L1 · Everyday Chemical Changes

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Chemistry · L1 · Everyday Chemical Changes

Flowchart10 objects

Chemistry

Chemistry · L5 · Marcus Theory: Why and How Fast Electron Transfer Happens · flowchart

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Chemistry · L5 · Marcus Theory: Why and How Fast Electron Transfer Happens · flowchart

Flowchart15 objects

Chemistry

Chemistry · L4 · Multi-equivalence-point titration curve of a triprotic acid

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Chemistry · L4 · Multi-equivalence-point titration curve of a triprotic acid

MoleculeCC(=O)O

Chemistry

Chemistry · L3 · Acetic Acid

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Chemistry · L3 · Acetic Acid

Flowchart13 objects

Chemistry

Chemistry · L3 · Catalytic Converter — Which Gas Becomes What

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Chemistry · L3 · Catalytic Converter — Which Gas Becomes What

Flowchart16 objects

Chemistry

Chemistry · L5 · Why the [2+2] Photocycloaddition Needs Light

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Chemistry · L5 · Why the [2+2] Photocycloaddition Needs Light

Flashcards10 cards

What is the difference between a covalent bond and an intermolecular force?1 / 10

A covalent bond is a strong force WITHIN a molecule, holding its atoms together by sharing electrons. An intermolecular force is a much weaker force BETWEEN separate molecules.

Chemistry

Chemistry · L3 · Intermolecular Forces

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Chemistry · L3 · Intermolecular Forces

Collection5 items

01Chemistry · L3 · Oxidation States & Balancing Redox Equations

02Chemistry · L3 · Assigning Oxidation Numbers

03Chemistry · L3 · Oxidation States & Redox Balancing — 6 Q

+2 more

Chemistry

Chemistry · L3 · Oxidation States & Balancing Redox Equations

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Chemistry · L3 · Oxidation States & Balancing Redox Equations

Collection6 items

01Chemistry · L1 · Colors That Change

02Chemistry · L1 · Colours That Change

03Chemistry · L1 · Cabbage Juice Colour Clues

+3 more

Chemistry

Chemistry · L1 · Colors That Change

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Chemistry · L1 · Colors That Change

Flowchart10 objects

Chemistry

Chemistry · L3 · Electroplating with copper

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Chemistry · L3 · Electroplating with copper

Collection5 items

01Chemistry · L4 · Blast Furnace and Electrolytic Refining

02Chemistry · L4 · Blast Furnace and Electrolytic Refining

03Chemistry · L4 · Blast Furnace Flux: Limestone to Slag

+2 more

Chemistry

Chemistry · L4 · Blast Furnace and Electrolytic Refining

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Chemistry · L4 · Blast Furnace and Electrolytic Refining

Note~964 words · 5 min

Hess's Law calculations: building an unmeasurable ΔH from measurable steps Enthalpy is a state function: ΔH for a reaction depends only on the initial and final states, not on the path taken between them. Hess's Law turns that fact into a c

Chemistry

Chemistry · L4 · Hess's Law calculations: cycles, scaling, and the Born–Haber cycle

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Chemistry · L4 · Hess's Law calculations: cycles, scaling, and the Born–Haber cycle

Collection4 items

01Chemistry · L1 · Evaporation and Condensation

02Chemistry · L1 · Evaporation and Condensation

03Chemistry · L1 · The Everyday Water Cycle

+1 more

Chemistry

Chemistry · L1 · Evaporation and Condensation

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Chemistry · L1 · Evaporation and Condensation

Note~561 words · 3 min

Four Gases, Four Tests Chemists often need to identify an unknown gas quickly, without any fancy equipment. Over time, four simple tests have become standard — one for each of the gases you meet again and again in the lab: oxygen, carbon di

Chemistry

Chemistry · L2 · Testing for Gases

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Chemistry · L2 · Testing for Gases

Collection5 items

01Chemistry · L5 · Organometallic Chemistry: Electron Counting & Elementary Steps

02Chemistry · L5 · Organometallic Catalytic Cycles: The 18-Electron Rule in Action

03Chemistry · L5 · Elementary Steps of Organometallic Catalysis

+2 more

Chemistry

Chemistry · L5 · Organometallic Chemistry

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Chemistry · L5 · Organometallic Chemistry

Flashcards10 cards

What distinguishes outer-sphere from inner-sphere electron transfer?1 / 10

In outer-sphere ET, donor and acceptor never form a bond — the electron tunnels across the gap during a brief close approach, and both species keep their original coordination spheres intact. In inner-sphere ET, a ligand bridges the two metal centres (bond forms, then breaks), as in Taube's classic Cr²⁺ + Co(NH₃)₅Cl²⁺ chloride-bridged experiment. Marcus theory in its simplest form treats outer-sphere transfer.

Chemistry

Chemistry · L5 · Marcus Theory & Electron Transfer Kinetics

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Chemistry · L5 · Marcus Theory & Electron Transfer Kinetics

Note~1236 words · 6 min

Enzyme kinetics: the Michaelis-Menten equation Enzyme catalysis is one of the richest, most consequential applications of the steady-state approximation you met for a generic two-step mechanism with an intermediate. There, a reactant A form

Chemistry

Chemistry · L5 · Enzyme Kinetics

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Chemistry · L5 · Enzyme Kinetics

Flashcards10 cards

What is the general idea behind spectroscopy?1 / 10

Shine a form of energy (usually light) at a sample and see what happens to it — what gets absorbed, transmitted, or emitted. Because different structures interact with energy differently, the result reveals something about the sample's structure.

Chemistry

Chemistry · L4 · Spectroscopy Basics

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Chemistry · L4 · Spectroscopy Basics

Flashcards8 cards

State Raoult's law for the vapor pressure of the solvent above an ideal solution.1 / 8

P_solution = X_solvent · P°_solvent, where X_solvent is the mole fraction of solvent in the solution and P°_solvent is the vapor pressure of the pure solvent at that temperature. Dissolving a non-volatile solute always lowers X_solvent below 1, so P_solution < P°_solvent.

Chemistry

Chemistry · L4 · Raoult's Law & Osmotic Pressure

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Chemistry · L4 · Raoult's Law & Osmotic Pressure

Flowchart9 objects

Chemistry

Chemistry · L3 · From Reactants to Percent Yield

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Chemistry · L3 · From Reactants to Percent Yield

Flashcards6 cards

Why is a 2D NMR experiment needed for a complex molecule when 1D ¹H NMR already gives chemical shifts and coupling patterns?1 / 6

For a molecule with many similar protons, a 1D spectrum gets too crowded — peaks overlap and individual couplings become impossible to read out. A 2D experiment spreads the same information across two frequency axes instead of one, so each correlation gets its own point in a plane rather than competing for space on a single line. This resolves overlap and directly reveals WHICH nuclei are related to which, rather than just listing shifts and multiplicities.

Chemistry

Chemistry · L5 · 2D NMR: COSY & HSQC

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Chemistry · L5 · 2D NMR: COSY & HSQC

Note~289 words · 1 min

Groups and Periods The periodic table lines up every known element by atomic number — the number of protons in each atom. Element number 1 (hydrogen) comes first, element number 2 (helium) comes next, and so on, all the way past 100. The ta

Chemistry

Chemistry · L2 · Periodic Table Basics

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Chemistry · L2 · Periodic Table Basics

Flowchart13 objects

Chemistry

Chemistry · L3 · Why We Crack Long-Chain Hydrocarbons

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Chemistry · L3 · Why We Crack Long-Chain Hydrocarbons

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