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This is dependent on the amount of heat involved. Low range of heat and the Molecules simply begin to move faster and generate heat within the material. High range of heat and the molecules can be broken apart causing chemical reactions that physically change the material. For example, Hydrogen Peroxide H2O2 will ultimately break down into H2O and O2. The lone O atom is unstable and quickly becomes O2.

Another change can be rapid Oxidation (Burning). This radically changes the material.

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What happens when most substances are heated?

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When heated, most substances expand due to the increase in kinetic energy of their atoms or molecules. This leads to an increase in the average distance between the particles, causing the substance to expand.


What happens to a solid when is heated?

A substance in the solid phase will typically expand when heated. Most substances when heated sufficiently will melt into a liquid, assuming that they do not combust or sublimate.


What expands when its heated?

Most substances expand when heated.


What do most substances like the liquid in a thermometer do when they are heated?

expand


How does the density of most substances change when they are heated?

Most substances expand and become less dense when heated because the increased thermal energy causes the molecules to move farther apart, which decreases the density. However, there are exceptions such as water, which becomes denser when heated from 0°C to 4°C due to its unique behavior when transitioning from a liquid to a solid.


What happens when evaporation occurs?

When heated up, water molecules (and most molecules in general) will speed up, and start moving quickly. When they reach a certain heat, they turn into gas. It's quite simple.


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Why do the densities of most substance decrease with temperature?

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