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How do hot packs and cold packs change temperature?

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How do hot packs and cold packs change temperature?

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This simulation shows how endothermic and exothermic changes occur at the molecular level inside of instant hot and cold packs.

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Hot Pack Cold Pack (Exothermic and Endothermic Processes) | Chemistry Simulations | CK-12

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Explore endothermic and exothermic process by making a cold pack or hot pack.

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Quick video showing how a reusable heat pack works. This can be used for solutions since it demonstrates a supersaturated solution, as well as energy since it shows changes in temperature due to chemical reactions

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Description: This phenomenon uses a supersaturated solution of sodium acetate. Clicking the metal disc releases a small number of crystals of sodium acetate which act as nucleation sites for the crystallization of the sodium acetate into a hydrated salt. Energy is released from the crystal lattice. The heating pack can be placed in boiling water and the sodium acetate can be dissolved again. This phenomenon shows how bond energy can be released. It also shows the importance of chemical engineering and could lead to a section where students design a device (or application) of their own.

Web Resource: Chemical Heat Pack - Wikipedia, Snappy Heat - Amazon

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Reusable Heat Packs - The Wonder of Science

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Description: This phenomenon uses a supersaturated solution of sodium acetate. Clicking the metal disc releases a small number of crystals of sodium acetate which act as nucleation sites for the crystallization of the sodium acetate into a hydrated salt. Energy is released from t

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Simulation of boiling and melting points. Shows physical changes of a substance.

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Melting and Boiling Simulation | PBS LearningMedia

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Observe the motion and temperature of water molecules in this simulation as heat is applied to a beaker containing an ice cube. As the ice cube melts, the water molecules are freed from their trapped state and can now roam about the glass beaker as a liquid.

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Virtual density lab that can be used to calculate the density of different substances

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Use water displacement and a mass balance to determine the density of various objects in this interactive simulation of a classic physical science density lab. Can you determine the identity of the mystery substance from its density alone?

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Simulation demonstrating how electronegativity plays a role in polarity and shape of molecule

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Unit C.3 L8 - Molecule Polarity - OpenSciEd

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Simulation showing how energy is absorbed during the breaking of a chemical bond

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Unit C.5 L4 - Breaking Bonds - OpenSciEd

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Simulation of intermolecular forces between water molecules

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Explore the behavior of water molecules in this interactive simulation as they bounce, ricochet, and attract each other. How does the behavior of the molecules change when the temperature goes up? Please Note-this is a 2-dimensional simulation, and does not show the 3-dimensional formation of ice crystals.

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Activity in which students predict and test the difference between melting land or sea ice. Connects density and matter

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You might have heard that melting ice contributes to sea level rise. But it makes a difference whether that melting ice is on land or in the sea.

Make a prediction about what each type of ice will do to the level of water in a container. Then build a model to compare what you predicted to what you observe.

Watch the Tutorial

See below for materials and step-by-step instructions. For more video tutorials and activities like this one, visit Learning Space.

Watch en Español: Seleccione subtítulos en Español bajo el ícono de configuración.

In this episode of Learning Space, you'll do an experiment to see how the melting of land ice and sea ice contributes to global sea level rise. | Watch on YouTube

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Student Project: How Melting Ice Causes Sea Level Rise | NASA/JPL Edu

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Learn the difference between land ice and sea ice, then do an experiment to see how the melting of each contributes to global sea level rise.

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The Conservation of Matter During Physical and Chemical Changes

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The Conservation of Matter During Physical and Chemical Changes

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Article on how matter is conserved during both physical and chemical changes.

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Image

Photograph by OJO Images Ltd.

Matter makes up everything visible in the known universe, from porta-potties to supernovas. And because matter is never created or destroyed, it cycles through our world. Atoms that were in a dinosaur millions of years ago-and in a star billions of years before that-may be inside you today.

Matter is anything that has mass and takes up space. It includes molecules, atoms, fundamental particles, and any substance that these particles make up. Matter can change form through physical and chemical changes, but through any of these changes matter is conserved. The same amount of matter exists before and after the change-none is created or destroyed. This concept is called the Law of Conservation of Mass.

In a physical change, a substance's physical properties may change, but its chemical makeup does not. Water, for example, is made up of two hydrogen atoms and one oxygen atom. Water is the only known substance on Earth that exists naturally in three states: solid, liquid, and gas. To change between these states, water must undergo physical changes. When water freezes, it becomes hard and less dense, but it is still chemically the same. There are the same number of water molecules present before and after the change, and water's chemical properties remain constant.

To form water, however, hydrogen and oxygen atoms must undergo chemical changes. For a chemical change to occur, atoms must either break bonds and/or form bonds. The addition or subtraction of atomic bonds changes the chemical properties of the substances involved. Both hydrogen and oxygen are diatomic-they exist naturally as bonded pairs (H ₂ and O ₂, respectively). In the right conditions, and with enough energy, these diatomic bonds will break and the atoms will join to form H ₂ O (water). Chemists write out this chemical reaction as:

2H ₂ + O ₂ → 2H ₂ O

This equation says that it takes two molecules of hydrogen and one molecule of oxygen to form two molecules of water. Notice that there are the same number of hydrogen atoms and oxygen atoms on either side of the equation. In chemical changes, just as in physical changes, matter is conserved. The difference in this case is that the substances before and after the change have different physical and chemical properties. Hydrogen and oxygen are gases at standard temperature and pressure, whereas water is a colorless, odorless liquid.

Ecosystems have many chemical and physical changes happening all at once, and matter is conserved in each and every one-no exceptions. Consider a stream flowing through a canyon-how many chemical and physical changes are happening at any given moment?

First, let's consider the water. For many canyon streams, the water comes from higher elevations and originates as snow. Of course that's not where the water began-it's been cycled all over the world since Earth first had water. But in the context of the canyon stream, it began in the mountains as snow. The snow must undergo a physical change-melting-to join the stream. As the liquid water flows through the canyon, it may evaporate (another physical change) into water vapor. Water gives a very clear example of how matter cycles through our world, frequently changing form but never disappearing.

Next, consider the plants and algae living in and along the stream. In a process called photosynthesis, these organisms convert light energy from the sun into chemical energy stored in sugars. However, the light energy doesn't produce the atoms that make up those sugars-that would break the Law of Conservation of Mass-it simply provides energy for a chemical change to occur. The atoms come from carbon dioxide in the air and water in the soil. Light energy allows these bonds to break and reform to produce sugar and oxygen, as shown in the chemical equation for photosynthesis:

6CO ₂ + 6H ₂O + light → C ₆H ₁₂O ₆ (sugar)+ 6O ₂

This equation says that six carbon dioxide molecules combine with six water molecules to form one sugar molecule and six molecules of oxygen. If you added up all the carbon, hydrogen, and oxygen atoms on either side of the equation, the sums would be equal; matter is conserved in this chemical change.

When animals in and around the stream eat these plants, their bodies use the stored chemical energy to power their cells and move around. They use the nutrients in their food to grow and repair their bodies-the atoms for new cells must come from somewhere. Any food that enters an animal's body must either leave its body or become part of it; no atoms are destroyed or created.

Matter is also conserved during physical and chemical changes in the rock cycle. As a stream carves deeper into a canyon, the rocks of the canyon floor don't disappear. They're eroded by the stream and carried off in small bits called sediments. These sediments may settle at the bottom of a lake or pond at the end of the stream, building up in layers over time. The weight of each additional layer compacts the layers beneath it, eventually adding so much pressure that new sedimentary rock forms. This is a physical change for the rock, but with the right conditions the rock may chemically change too. In either case, the matter in the rock is conserved.

The bottom line is: Matter cycles through the universe in many different forms. In any physical or chemical change, matter doesn't appear or disappear. Atoms created in the stars (a very, very long time ago) make up every living and nonliving thing on Earth-even you. It's impossible to know how far and through what forms your atoms traveled to make you. And it's impossible to know where they will end up next.

This isn't the whole story of matter, however, it's the story of visible matter. Scientists have learned that about 25 percent of the universe's mass consists of dark matter-matter that cannot be seen but can be detected through its gravitational effects. The exact nature of dark matter has yet to be determined. Another 70 percent of the universe is an even more mysterious component called dark energy, which acts counter to gravity. So "normal" matter makes up, at most, five percent of the universe.

National Geographic Society

October 19, 2023

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The Conservation of Matter During Physical and Chemical Changes

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Matter makes up all visible objects in the universe, and it can be neither created nor destroyed.