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Chemistry: explore STEM content (page 19 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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Flowchart13 objects

Chemistry

Chemistry · L3 · Empirical and Molecular Formula · flowchart

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Chemistry · L3 · Empirical and Molecular Formula · flowchart

Collection4 items

01Chemistry · L1 · Mixtures vs. Solutions

02Chemistry · L1 · Mixtures vs. Solutions

03Chemistry · L1 · Mixture or Solution?

+1 more

Chemistry

Chemistry · L1 · Mixtures vs. Solutions

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Chemistry · L1 · Mixtures vs. Solutions

Note~411 words · 2 min

Every Acid Reaction Makes a Salt You already know acids from bases by their pH. What matters now is what happens when an acid actually reacts with something: it almost always forms a salt. A salt is a compound made when the hydrogen in the

Chemistry

Chemistry · L2 · Making Salts

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Chemistry · L2 · Making Salts

Note~1002 words · 5 min

Classifying polymers by thermal and mechanical behavior L3 covered HOW polymer chains get built — addition versus condensation. This note asks a different question: once a chain exists, how does the material actually BEHAVE when you heat it

Chemistry

Chemistry · L4 · Classifying Polymers by Thermal & Mechanical Behavior

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Chemistry · L4 · Classifying Polymers by Thermal & Mechanical Behavior

Quiz6 questions

Which two dissolved ions are responsible for making water 'hard'?

ASodium and chloride ionsBCalcium and magnesium ionsCPotassium and carbonate ionsDHydrogen and hydroxide ions

Chemistry

Chemistry · L3 · Water Hardness

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Chemistry · L3 · Water Hardness

Flowchart7 objects

Chemistry

Chemistry · L1 · Mixture or Solution?

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Chemistry · L1 · Mixture or Solution?

Flowchart14 objects

Chemistry

Chemistry · L5 · Antenna-Sensitized Lanthanide Luminescence

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Chemistry · L5 · Antenna-Sensitized Lanthanide Luminescence

Quiz6 questions

A rate vs concentration graph is a straight line passing through the origin. What is the reaction order?

AFirst orderBZero orderCSecond orderDCannot be determined from a graph

Chemistry

Chemistry · L3 · Reading Rate Graphs — 6 Q

@openstem

Chemistry · L3 · Reading Rate Graphs — 6 Q

Flowchart14 objects

Chemistry

Chemistry · L5 · Entropy from Microstates: Gas vs Solid

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Chemistry · L5 · Entropy from Microstates: Gas vs Solid

Flowchart13 objects

Chemistry

Chemistry · L2 · Making Salts · flowchart

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Chemistry · L2 · Making Salts · flowchart

Note~74 words · 1 min

Sorting and Recycling Materials When you finish with something, it does not have to be gone forever. Many materials can be turned into something new — but only if they end up in the right bin. Which Bin Does It Go In? Before something can b

Chemistry

Chemistry · L1 · Sorting and Recycling Materials

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Chemistry · L1 · Sorting and Recycling Materials

Quiz6 questions

A reaction has ΔH = −120 kJ/mol and ΔS = +85 J/(mol·K). Which best describes its spontaneity?

AAlways spontaneous, at every temperatureBNever spontaneous, at any temperatureCSpontaneous only below some crossover temperatureDSpontaneous only above some crossover temperature

Chemistry

Chemistry · L4 · Gibbs Free Energy & Spontaneity — 6 Q

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Chemistry · L4 · Gibbs Free Energy & Spontaneity — 6 Q

Collection4 items

01Chemistry · L2 · The Chemistry of Food Preservation

02Chemistry · L2 · The Chemistry of Food Preservation

03Chemistry · L2 · Comparing Food Preservation Methods

+1 more

Chemistry

Chemistry · L2 · The Chemistry of Food Preservation

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Chemistry · L2 · The Chemistry of Food Preservation

Flashcards12 cards

On a rate vs concentration graph, what does a straight line through the origin tell you about the reaction order?1 / 12

The reaction is first order in that reactant — rate is directly proportional to concentration (rate = k×[A]); doubling [A] doubles the rate.

Chemistry

Chemistry · L3 · Reading Rate Graphs

@openstem

Chemistry · L3 · Reading Rate Graphs

Note~518 words · 3 min

The Carbon Cycle You've already seen that burning a fuel like methane produces carbon dioxide and water, and that carbon dioxide makes up a tiny slice of the air — about 0.04% of it. This page ties those two facts together into a single loo

Chemistry

Chemistry · L2 · The Carbon Cycle

@openstem

Chemistry · L2 · The Carbon Cycle

Quiz6 questions

Which test identifies oxygen gas?

ADamp red litmus paper turns blueBA glowing splint relights into a flameCLimewater turns cloudyDA lit splint gives a squeaky pop

Chemistry

Chemistry · L2 · Testing for Gases

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Chemistry · L2 · Testing for Gases

Flashcards9 cards

How can you tell how reactive a metal is just by watching it react with acid?1 / 9

Watch how fast bubbles form. Fast, vigorous fizzing means a more reactive metal. Slow, weak fizzing (or none at all) means a less reactive metal.

Chemistry

Chemistry · L2 · Evidence, Rust, and Uses

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Chemistry · L2 · Evidence, Rust, and Uses

Flashcards8 cards

You find a bottle you don't know. Should you taste what's inside?1 / 8

No, never! Some bottles hold chemicals that can hurt you. Only taste food and drinks you know are safe.

Chemistry

Chemistry · L1 · Staying Safe with Chemicals

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Chemistry · L1 · Staying Safe with Chemicals

Flashcards10 cards

What is fermentation?1 / 10

Fermentation is a chemical reaction in which yeast — a living microorganism — breaks down sugar without using any oxygen. It is a type of anaerobic respiration.

Chemistry

Chemistry · L2 · Fermentation

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Chemistry · L2 · Fermentation

Flowchart9 objects

Chemistry

Chemistry · L2 · Metals Reacting with Acids · flowchart

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Chemistry · L2 · Metals Reacting with Acids · flowchart

Flashcards5 cards

What is an atom?1 / 5

An atom is the smallest particle of an element. It is far too small to see, but everything around you is made of atoms.

Chemistry

Chemistry · L2 · Atoms and Molecules

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Chemistry · L2 · Atoms and Molecules

Flashcards8 cards

What is in a fruit salad?1 / 8

A fruit salad has different fruits mixed together, like apple, banana, and grapes.

Chemistry

Chemistry · L1 · Food Mixtures

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Chemistry · L1 · Food Mixtures

Flowchart11 objects

Chemistry

Chemistry · L1 · Where Do Materials Come From? · flowchart

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Chemistry · L1 · Where Do Materials Come From? · flowchart

Flashcards10 cards

What does the retention factor, Rf, measure in chromatography?1 / 10

Rf is the ratio of how far a substance's spot travelled up the paper to how far the solvent front travelled, both measured from the same starting line. It is a single number between 0 and 1 with no units.

Chemistry

Chemistry · L3 · Chromatography and Rf Values

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Chemistry · L3 · Chromatography and Rf Values

Flashcards11 cards

What does it mean when something floats?1 / 11

It means the object stays on top of the water instead of going under.

Chemistry

Chemistry · L1 · Floating and Sinking

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Chemistry · L1 · Floating and Sinking

Quiz6 questions

Why can't we usually see the air around us?

ABecause it is not really thereBBecause air is invisible, even though it is realCBecause air only appears at nightDBecause air is a solid

Chemistry

Chemistry · L1 · Air, Breathing, and Gases

@openstem

Chemistry · L1 · Air, Breathing, and Gases

Quiz6 questions

What does the E-factor measure, and why can atom economy alone miss what it captures?

AE-factor = mass of waste / mass of product, measured from the real executed process (solvents, purification losses, byproducts); atom economy is a purely stoichiometric prediction from the balanced equation before the reaction is runBE-factor and atom economy are just two names for the same calculationCE-factor measures only the byproduct mass predicted by stoichiometry, while atom economy accounts for solventsDAtom economy is always numerically higher than the E-factor for the same reaction, so the two cannot be compared

Chemistry