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Chemistry

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Chemistry: explore STEM content (page 44 of 47) · openstem

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Chemistry

Chemistry · L2 · Testing for Oxygen and Carbon Dioxide

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Chemistry · L2 · Testing for Oxygen and Carbon Dioxide

Quiz5 questions

What four thermodynamic quantities can a single, well-designed ITC titration determine simultaneously?

AOnly the association constant KaBStoichiometry (n), association constant (Ka, hence delta G), binding enthalpy (delta H), and by subtraction, binding entropy (delta S)COnly the melting temperature of the proteinDOnly the crystal structure resolution

Chemistry

Chemistry · L5 · Protein-Ligand Binding Thermodynamics

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Chemistry · L5 · Protein-Ligand Binding Thermodynamics

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Chemistry

Chemistry · L1 · Fruit Salad or Smoothie?

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Chemistry · L1 · Fruit Salad or Smoothie?

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Chemistry

Chemistry · L1 · How Sand Becomes Glass

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Chemistry · L1 · How Sand Becomes Glass

Quiz6 questions

What is fermentation?

AYeast burning sugar using oxygenBYeast breaking down sugar without using oxygenCA physical change where sugar just dissolvesDSugar cooling down until it turns solid

Chemistry

Chemistry · L2 · Fermentation

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Chemistry · L2 · Fermentation

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Chemistry

Chemistry · L5 · Competitive vs Noncompetitive Enzyme Inhibition

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Chemistry · L5 · Competitive vs Noncompetitive Enzyme Inhibition

Quiz5 questions

Why does salting meat help stop it from spoiling?

AThe salt directly destroys the DNA inside bacteria and mould cellsBA high salt concentration draws water out of microbe cells, drying them outCSalt raises the temperature of the meat enough to kill microbesDSalt reacts chemically with the meat to seal out all air

Chemistry

Chemistry · L2 · The Chemistry of Food Preservation

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Chemistry · L2 · The Chemistry of Food Preservation

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Chemistry

Chemistry · L3 · Why Atomic Radius Rises and Falls

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Chemistry · L3 · Why Atomic Radius Rises and Falls

MoleculeCCO

Chemistry

Chemistry · L3 · Ethanol

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Chemistry · L3 · Ethanol

Note~676 words · 3 min

From percent composition to a ratio of atoms Stoichiometry gave you a one-step conversion: mass to moles, using n = m/M. Empirical formula work uses that exact same conversion three times in a row — once per element — and then compares the

Chemistry

Chemistry · L3 · Empirical and Molecular Formula

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Chemistry · L3 · Empirical and Molecular Formula

Collection5 items

01Chemistry · L3 · Redox Reactions & Electrochemistry

02Chemistry · L3 · Redox & Electrochemistry

03Chemistry · L3 · OIL RIG — Tracing Electron Transfer

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Chemistry

Chemistry · L3 · Redox Reactions & Electrochemistry

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Chemistry · L3 · Redox Reactions & Electrochemistry

Quiz6 questions

Why is cotton comfortable to wear on a hot day?

AIt is naturally fire-resistantBIt is breathable and absorbs moisture wellCIt dries faster than any other fiberDIt never wrinkles

Chemistry

Chemistry · L2 · Natural and Synthetic Fibers

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Chemistry · L2 · Natural and Synthetic Fibers

Collection4 items

01Chemistry · L5 · The Kinetic Isotope Effect

02Chemistry · L5 · The Kinetic Isotope Effect

03Chemistry · L5 · Why a C–D Bond Needs More Energy to Break Than a C–H Bond

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Chemistry

Chemistry · L5 · The Kinetic Isotope Effect

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Chemistry · L5 · The Kinetic Isotope Effect

Quiz5 questions

What makes a dissolved substance an "electrolyte"?

AIt changes the colour of the waterBIt splits into charged ions that let the solution conduct electricityCIt always makes the water taste sweetDIt stops the water from freezing

Chemistry

Chemistry · L2 · Electrolytes and Sports Drinks

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Chemistry · L2 · Electrolytes and Sports Drinks

Quiz5 questions

Where does a zeolite's Bronsted acidity structurally come from?

AIsomorphic substitution of Al3+ for Si4+ in the framework leaves an extra negative charge, balanced by a proton on a bridging Si-OH-Al oxygenBFree sulfuric acid trapped within the poresCSurface hydroxyl groups unrelated to the aluminosilicate frameworkDA metal ion exchanged onto the external crystal surface only

Chemistry

Chemistry · L5 · Zeolite Catalysis

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Chemistry · L5 · Zeolite Catalysis

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Chemistry

Chemistry · L5 · Interpreting a COSY Spectrum

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Chemistry · L5 · Interpreting a COSY Spectrum

Collection7 items

01Chemistry · L1 · Solids, Liquids, and Gases

02Chemistry · L1 · Mixing and Dissolving

03Chemistry · L1 · Melting and Freezing

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Chemistry

Chemistry · L1 · Materials & States of Matter

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Chemistry · L1 · Materials & States of Matter

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Chemistry

Chemistry · L2 · Metals and Reactivity · flowchart

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Chemistry · L2 · Metals and Reactivity · flowchart

Flowchart15 objects

Chemistry

Chemistry · L4 · Classifying an unknown crystalline solid by its properties

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Chemistry · L4 · Classifying an unknown crystalline solid by its properties

Note~411 words · 2 min

Chemical kinetics: rate laws, activation energy, and catalysis Chemical kinetics studies how fast reactions occur and what factors govern reaction rate. Kinetics is distinct from thermodynamics: a reaction can be thermodynamically spontaneo

Chemistry

Chemistry · L4 · Chemical kinetics: rate laws, activation energy, and catalysis

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Chemistry · L4 · Chemical kinetics: rate laws, activation energy, and catalysis

Flowchart13 objects

Chemistry

Chemistry · L2 · Single-Use vs Rechargeable Batteries

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Chemistry · L2 · Single-Use vs Rechargeable Batteries

Quiz6 questions

What does a catalyst do to a reaction's activation energy, and is it consumed overall?

ALowers Ea by providing an alternate pathway; not consumed overallBLowers Ea by providing an alternate pathway; consumed overallCRaises Ea to slow down unwanted side reactions; not consumedDHas no effect on Ea, but binds permanently to the product

Chemistry

Chemistry · L4 · Catalysis & Green Chemistry — 6 Q

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Chemistry · L4 · Catalysis & Green Chemistry — 6 Q

Flowchart14 objects

Chemistry

Chemistry · L5 · Spectroelectrochemistry: Watching Electron Transfer Happen · flowchart

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Chemistry · L5 · Spectroelectrochemistry: Watching Electron Transfer Happen · flowchart

Note~236 words · 1 min

Solid, Liquid, or Gas? Look around your kitchen. A spoon, a puddle of juice, and the steam over a hot pot are all matter — but they behave in three very different ways. Three States You Already Know Same Stuff, Different Form Here is the su

Chemistry

Chemistry · L1 · Solid, Liquid, or Gas?

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Chemistry · L1 · Solid, Liquid, or Gas?

Flashcards12 cards

What is a polyatomic ion, and how is it different from a monatomic ion like Cl⁻?1 / 12

A polyatomic ion is a group of atoms bonded tightly together that carries one overall charge and moves as a single unit in a formula — for example, the sulfate ion SO4²⁻ is one sulfur atom and four oxygen atoms sharing a single 2- charge between them. A monatomic ion like Cl⁻ is just one atom carrying the charge on its own.

Chemistry

Chemistry · L3 · Naming and Writing Ionic Formulae

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Chemistry · L3 · Naming and Writing Ionic Formulae

Flashcards8 cards

What three things make up the fire triangle?1 / 8

Fuel, oxygen, and heat. A fire needs all three at the same time — take away any one and the fire goes out.

Chemistry

Chemistry · L2 · The Fire Triangle

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Chemistry · L2 · The Fire Triangle

Collection4 items

01Chemistry · L3 · Specific Latent Heat

02Chemistry · L3 · Specific Latent Heat

03Chemistry · L3 · Why Temperature Plateaus During a Phase Change

+1 more

Chemistry

Chemistry · L3 · Specific Latent Heat

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Chemistry · L3 · Specific Latent Heat

Note~813 words · 4 min

Why Pure Metals Are Malleable In a pure metal, every atom is the same size and packs into a regular, repeating arrangement of layers — think of identical marbles stacked neatly in rows. The outer electrons of every atom are delocalised into

Chemistry

Chemistry · L3 · Metallic Bonding and Why Alloys Are Harder

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Chemistry · L3 · Metallic Bonding and Why Alloys Are Harder

Quiz3 questions

What is the smallest particle of an element?

AA moleculeBAn atomCA compoundDA crystal

Chemistry

Chemistry · L2 · Atoms, Molecules, and Elements

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Chemistry · L2 · Atoms, Molecules, and Elements

MoleculeCl

Chemistry

Chemistry · L3 · Hydrogen Chloride (HCl)

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Chemistry · L3 · Hydrogen Chloride (HCl)

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