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Chemistry

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Chemistry: explore STEM content (page 34 of 47) · openstem

Flashcards7 cards

What is mass defect (Δm)?1 / 7

The difference between the sum of the masses of a nucleus's separate, free protons and neutrons and the actual (smaller) mass of the bound nucleus. It's the mass that seems to be 'missing' once the nucleons are bound together.

Chemistry

Chemistry · L4 · Nuclear Chemistry — Mass Defect & Binding Energy

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Chemistry · L4 · Nuclear Chemistry — Mass Defect & Binding Energy

Collection8 items

01Chemistry · L3 · Ionic and Covalent Bonding

02Chemistry · L3 · Ionic, Covalent & Metallic Bonding

03Chemistry · L3 · How an Ionic Bond Forms (Na + Cl)

+5 more

Chemistry

Chemistry · L3 · Ionic and Covalent Bonding

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Chemistry · L3 · Ionic and Covalent Bonding

Flashcards8 cards

What is a polarization curve, and what does its overall downward-sloping shape represent?1 / 8

A polarization curve plots a fuel cell's operating cell voltage against the current density it delivers; it always slopes downward from the theoretical open-circuit (equilibrium, zero-current) voltage because drawing any real current necessarily incurs voltage losses (overpotentials) at the electrodes and across the cell — the curve is, in effect, a direct visualization of how much of the cell's theoretical thermodynamic voltage is actually lost to real-world kinetic and transport limitations at a given operating current.

Chemistry

Chemistry · L5 · Electrocatalysis & Fuel Cells

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Chemistry · L5 · Electrocatalysis & Fuel Cells

Quiz5 questions

Which pair of elements is the clearest example of a diagonal relationship?

ALithium and sodiumBLithium and magnesiumCSodium and magnesiumDBeryllium and calcium

Chemistry

Chemistry · L4 · Periodic Anomalies — 5 Q

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Chemistry · L4 · Periodic Anomalies — 5 Q

Flashcards12 cards

What is a coordination complex?1 / 12

A central metal ion (usually a transition metal) surrounded by a fixed number of ligands — molecules or ions that donate an electron pair to the metal. The metal acts as a Lewis acid, the ligands as Lewis bases.

Chemistry

Chemistry · L4 · Coordination Chemistry

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Chemistry · L4 · Coordination Chemistry

Quiz5 questions

What happens when you make a fruit salad?

AThe fruits melt together into one new fruitBYou mix different fruits together, but each stays itselfCThe fruits turn into juiceDYou cook the fruits until they disappear

Chemistry

Chemistry · L1 · Mixing in the Kitchen Quiz

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Chemistry · L1 · Mixing in the Kitchen Quiz

Note~356 words · 2 min

A Smell Is Made of Tiny Particles When you smell fresh cookies, a flower, or even a skunk, you are not just imagining it. Tiny, invisible particles are coming off that thing and drifting through the air until some of them reach your nose. Y

Chemistry

Chemistry · L1 · Where Do Smells Come From?

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Chemistry · L1 · Where Do Smells Come From?

Flowchart5 objects

Chemistry

Chemistry · L3 · Solutions & Molarity · flowchart

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Chemistry · L3 · Solutions & Molarity · flowchart

Flowchart15 objects

Chemistry

Chemistry · L2 · Why Carbon Monoxide Is Dangerous

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Chemistry · L2 · Why Carbon Monoxide Is Dangerous

Flowchart7 objects

Chemistry

Chemistry · L1 · Washing Grease Off a Pan

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Chemistry · L1 · Washing Grease Off a Pan

Note~522 words · 3 min

Identifying the unknown Qualitative analysis asks a different question from most of chemistry so far — not 'how much?' but 'what is it?'. A handful of simple, fast tests — a flame test, a few drops of reagent turning cloudy, a gas relightin

Chemistry

Chemistry · L3 · Flame Tests & Ion Tests

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Chemistry · L3 · Flame Tests & Ion Tests

Flashcards7 cards

State Cram's preorganization principle.1 / 7

The more a host's binding sites are already arranged — both sterically and electronically — to complement a given guest before binding occurs, the stronger and more selective the resulting complex will be. A highly preorganized host pays little conformational or entropic 'cost' to reach its binding geometry, because it is already there.

Chemistry

Chemistry · L5 · Supramolecular Chemistry: Preorganization & Design

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Chemistry · L5 · Supramolecular Chemistry: Preorganization & Design

Note~957 words · 5 min

Polyprotic acids: stepwise dissociation, successive Ka values, and multi-equivalence-point titrations A polyprotic acid loses more than one proton, but it does so one proton at a time, through a series of distinct equilibria — each with its

Chemistry

Chemistry · L4 · Polyprotic acids: stepwise dissociation, successive Ka values, and multi-equivalence-point titrations

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Chemistry · L4 · Polyprotic acids: stepwise dissociation, successive Ka values, and multi-equivalence-point titrations

Note~700 words · 4 min

Aromatic Chemistry & Electrophilic Aromatic Substitution Benzene looks, on paper, like it should behave as three alkenes stitched into a ring — reactive C=C bonds ready to add bromine or hydrogen the way any alkene would. It doesn't. Benzen

Chemistry

Chemistry · L4 · Aromatic Chemistry & Electrophilic Aromatic Substitution

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Chemistry · L4 · Aromatic Chemistry & Electrophilic Aromatic Substitution

Note~94 words · 1 min

Materials Around Us Everything is made of a material. A material is what a thing is made from. We choose materials because of what they can do. Think about a cup. It could be plastic, glass, or metal. Each one feels different and works diff

Chemistry

Chemistry · L1 · Materials and What They Are Good For

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Chemistry · L1 · Materials and What They Are Good For

Flowchart17 objects

Chemistry

Chemistry · L2 · Energy Stored in Chemical Bonds · flowchart

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Chemistry · L2 · Energy Stored in Chemical Bonds · flowchart

Flowchart12 objects

Chemistry

Chemistry · L5 · Green Chemistry — Sustainable Catalysis: the E-factor, asymmetric catalysis, and green solvents · flowchart

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Chemistry · L5 · Green Chemistry — Sustainable Catalysis: the E-factor, asymmetric catalysis, and green solvents · flowchart

Collection4 items

01Chemistry · L3 · Transition Metals — Variable States and Color

02Chemistry · L3 · Transition metals: variable oxidation states and vivid color

03Chemistry · L3 · Spotting the transition-metal pattern in an unknown sample

+1 more

Chemistry

Chemistry · L3 · Transition Metals — Variable States and Color

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Chemistry · L3 · Transition Metals — Variable States and Color

Flashcards10 cards

How does lemon juice taste?1 / 10

Sour.

Chemistry

Chemistry · L1 · Sour or Soapy? Acids and Bases in the Kitchen

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Chemistry · L1 · Sour or Soapy? Acids and Bases in the Kitchen

MoleculeCC(=O)O

Chemistry

Chemistry · L3 · Acetic acid

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Chemistry · L3 · Acetic acid

Note~287 words · 1 min

Where Do Materials Come From? Every material comes from somewhere. Some materials grow or are found in nature. Others are made by people. We can sort materials by asking: where did this come from? Natural Materials A natural material grows

Chemistry

Chemistry · L1 · Where Do Materials Come From?

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Chemistry · L1 · Where Do Materials Come From?

Quiz6 questions

What is the final product when a primary alcohol is oxidized with excess hot acidified KMnO₄?

AAn aldehydeBA ketoneCA carboxylic acidDAn ester

Chemistry

Chemistry · L4 · Organic Chemistry II — Oxidation Ladder & Carboxylic Acids Quiz

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Chemistry · L4 · Organic Chemistry II — Oxidation Ladder & Carboxylic Acids Quiz

Flowchart17 objects

Chemistry

Chemistry · L2 · Basic Lab Safety Rules

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Chemistry · L2 · Basic Lab Safety Rules

Quiz6 questions

Ethene polymerizes into polyethylene by addition polymerization. What makes this possible?

AEthene has two reactive end groupsBEthene has a C=C double bond that opens up to link monomers togetherCEthene loses a water molecule at each linkDEthene is itself a natural polymer

Chemistry

Chemistry · L3 · Polymer Chemistry — 6 Q

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Chemistry · L3 · Polymer Chemistry — 6 Q

MoleculeFC(Cl)Br

Chemistry

Chemistry · L4 · Bromochlorofluoromethane

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Chemistry · L4 · Bromochlorofluoromethane

Collection5 items

01Chemistry · L3 · Catalysts in Industry

02Chemistry · L3 · Catalysts in Industry

03Chemistry · L3 · Catalytic Converter — Which Gas Becomes What

+2 more

Chemistry

Chemistry · L3 · Catalysts in Industry

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Chemistry · L3 · Catalysts in Industry

Flowchart15 objects

Chemistry

Chemistry · L2 · Natural vs Synthetic Polymers

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Chemistry · L2 · Natural vs Synthetic Polymers

Flashcards8 cards

What happens to chocolate when it gets warm?1 / 8

It melts! Warm chocolate turns from a hard bar into a smooth, runny liquid.

Chemistry

Chemistry · L1 · Heating and Cooling Food

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Chemistry · L1 · Heating and Cooling Food

Flowchart15 objects

Chemistry

Chemistry · L5 · Choosing a Computational Method

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Chemistry · L5 · Choosing a Computational Method

Note~310 words · 2 min

How Soap Cleans You already know that sugar and salt dissolve in water, but oil and grease do not. Grease just sits on top of water, no matter how much you stir it. So how do we ever get a greasy pan clean? The answer is soap. Soap Has Two

Chemistry

Chemistry · L1 · How Soap Cleans

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Chemistry · L1 · How Soap Cleans

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