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

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Chemistry

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Chemistry: explore STEM content (page 9 of 47) · openstem

Flashcards10 cards

An alcohol and a carboxylic acid are mixed together. What reaction can occur, and what two products does it give?1 / 10

Esterification: the alcohol and carboxylic acid react — usually with an acid catalyst and gentle heating — to form an ESTER plus WATER.

Chemistry

Chemistry · L3 · Esters — Formation and Uses

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Chemistry · L3 · Esters — Formation and Uses

Flowchart7 objects

Chemistry

Chemistry · L3 · Endothermic Reaction — Energy Diagram

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Chemistry · L3 · Endothermic Reaction — Energy Diagram

Collection5 items

01Chemistry · L2 · Density

02Chemistry · L2 · Density

03Chemistry · L2 · Why Objects Float or Sink

+2 more

Chemistry

Chemistry · L2 · Density

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Chemistry · L2 · Density

Note~387 words · 2 min

Carbon's Special Talent Carbon forms four covalent bonds — and it can use those bonds to link to other carbon atoms, over and over, building long chains, branches, and rings. Almost no other element does this so readily. That one property i

Chemistry

Chemistry · L3 · Organic Chemistry: Functional Groups & Naming

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Chemistry · L3 · Organic Chemistry: Functional Groups & Naming

Collection6 items

01Chemistry · L2 · Periodic Table Basics

02Chemistry · L2 · Periodic Table Basics

03Chemistry · L2 · Groups of the Periodic Table

+3 more

Chemistry

Chemistry · L2 · Periodic Table Basics

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Chemistry · L2 · Periodic Table Basics

Quiz3 questions

Which of these is a chemical change?

ACutting a piece of paperBMelting butterCBurning woodDDissolving sugar

Chemistry

Chemistry · L2 · Physical and Chemical Changes

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Chemistry · L2 · Physical and Chemical Changes

Note~451 words · 2 min

Thermochemistry basics: measuring and mapping reaction heat Every chemical reaction absorbs or releases energy, usually as heat. Thermochemistry starts with two simple ideas: we can MEASURE that heat with a thermometer, and we can DRAW it a

Chemistry

Chemistry · L3 · Thermochemistry Basics

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Chemistry · L3 · Thermochemistry Basics

MoleculeO

Chemistry

Chemistry · L3 · Water (H₂O)

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Chemistry · L3 · Water (H₂O)

Flowchart13 objects

Chemistry

Chemistry · L3 · Which Gas Law Do I Use?

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Chemistry · L3 · Which Gas Law Do I Use?

Collection5 items

01Chemistry · L1 · Why Food Colouring Spreads Through Water

02Chemistry · L1 · Why Food Colouring Spreads Through Water

03Chemistry · L1 · A Drop of Dye Spreading Over Time

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Chemistry

Chemistry · L1 · Why Food Colouring Spreads Through Water

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Chemistry · L1 · Why Food Colouring Spreads Through Water

Flowchart9 objects

Chemistry

Chemistry · L2 · Naming a Salt from Its Acid

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Chemistry · L2 · Naming a Salt from Its Acid

MoleculeOc1ccc2ccccc2c1-c1c(O)ccc2ccccc12

Chemistry

Chemistry · L5 · BINOL (1,1'-Bi-2-naphthol)

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Chemistry · L5 · BINOL (1,1'-Bi-2-naphthol)

MoleculeBrc1ccccc1

Chemistry

Chemistry · L4 · Bromobenzene

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Chemistry · L4 · Bromobenzene

Flowchart15 objects

Chemistry

Chemistry · L4 · Effusion, diffusion, and Graham's law · flowchart

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Chemistry · L4 · Effusion, diffusion, and Graham's law · flowchart

Collection5 items

01Chemistry · L4 · Electrochemistry: Standard Potentials & Cell Calculations

02Chemistry · L4 · Electrochemistry: standard potentials, the Nernst equation, and cell types

03Chemistry · L4 · Galvanic vs electrolytic cells: energy conversion & examples

+2 more

Chemistry

Chemistry · L4 · Electrochemistry

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Chemistry · L4 · Electrochemistry

Flowchart7 objects

Chemistry

Chemistry · L3 · Solutions & Molarity · flowchart

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Chemistry · L3 · Solutions & Molarity · flowchart

Flowchart10 objects

Chemistry

Chemistry · L4 · Why carboxylic acids are stronger acids than alcohols

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Chemistry · L4 · Why carboxylic acids are stronger acids than alcohols

Flashcards10 cards

What is density?1 / 10

Density tells you how tightly packed the matter in an object is — how much mass is squeezed into each unit of volume. A dense object has a lot of mass in a small space.

Chemistry

Chemistry · L2 · Density

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Chemistry · L2 · Density

Flowchart11 objects

Chemistry

Chemistry · L2 · How Distillation Works

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Chemistry · L2 · How Distillation Works

Note~1028 words · 5 min

Stratospheric ozone chemistry and the greenhouse effect Two of the most consequential pieces of atmospheric chemistry are also two of the most casually explained. 'CFCs destroy the ozone layer' and 'CO₂ traps heat' are both true, but both s

Chemistry

Chemistry · L4 · Atmospheric Chemistry — Ozone and the Greenhouse Effect

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Chemistry · L4 · Atmospheric Chemistry — Ozone and the Greenhouse Effect

Flashcards11 cards

Why do people put salt on icy sidewalks in winter?1 / 11

Salt makes it much harder for water to stay frozen. The hard ice turns into slushy water, which is safer to walk on.

Chemistry

Chemistry · L1 · Why Salt Melts Icy Roads

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Chemistry · L1 · Why Salt Melts Icy Roads

Quiz6 questions

A zero-order reaction has k = 0.0250 mol L⁻¹ s⁻¹ and [A]₀ = 1.00 M. What is [A] after t = 15.0 s?

A0.625 MB0.375 MC0.500 MD1.375 M

Chemistry

Chemistry · L4 · Integrated Rate Laws — 6 Q

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Chemistry · L4 · Integrated Rate Laws — 6 Q

Note~647 words · 3 min

Transition metal chemistry in solution: colors, amphoterism, and trends Beyond the coordination chemistry of ligands and geometry, transition metals show a set of characteristic descriptive behaviors in aqueous solution: distinctive aqua-io

Chemistry

Chemistry · L4 · Transition metal chemistry in solution: colors, amphoterism, and trends

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Chemistry · L4 · Transition metal chemistry in solution: colors, amphoterism, and trends

Quiz6 questions

A white precipitate forms on adding a few drops of NaOH to an unknown cation solution, and it completely redissolves on adding excess NaOH. Which further reagent, added in excess to a fresh sample, would distinguish Zn²⁺ from Al³⁺ or Pb²⁺?

AExcess dilute hydrochloric acidBExcess ammonia solutionCBarium chloride solutionDWarm dilute sulfuric acid

Chemistry

Chemistry · L4 · Systematic Qualitative Inorganic Analysis — 6 Q

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Chemistry · L4 · Systematic Qualitative Inorganic Analysis — 6 Q

MoleculeC

Chemistry

Chemistry · L3 · Methane

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Chemistry · L3 · Methane

Flowchart15 objects

Chemistry

Chemistry · L5 · Biaryl Rotational Barrier and Configurational Stability

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Chemistry · L5 · Biaryl Rotational Barrier and Configurational Stability

Flowchart13 objects

Chemistry

Chemistry · L3 · Which Type of Bond Forms?

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Chemistry · L3 · Which Type of Bond Forms?

Note~580 words · 3 min

Oxidation and reduction: it's all about electrons Every redox reaction is really two things happening at once: one substance loses electrons, and another substance gains them. Chemists remember the direction with a mnemonic — OIL RIG: The t

Chemistry

Chemistry · L3 · Redox Reactions & Electrochemistry

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Chemistry · L3 · Redox Reactions & Electrochemistry

Flowchart21 objects

Chemistry

Chemistry · L2 · Three Ways to Extract a Metal

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Chemistry · L2 · Three Ways to Extract a Metal

Flashcards7 cards

Why does linear HDPE pack into a more crystalline, denser solid than branched LDPE, even though both are polyethylene?1 / 7

HDPE's chains are essentially unbranched, so they lie parallel to one another and fold into tightly packed, ordered lamellae. LDPE's frequent short- and long-chain branches stick out sideways and physically block that regular packing, forcing more of the material into disordered amorphous regions — lower crystallinity, lower density.

Chemistry

Chemistry · L5 · Chain Structure → Bulk Properties

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Chemistry · L5 · Chain Structure → Bulk Properties

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