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Why might scientist who study changes of state build models showing the arrangements of particles in a substance?
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Describe how the motion and arrangements of particles change as a substance freezes?
The particles get so attracted to each other making them form into a solid
What happens to the distance between particles of a substance as it changes from a liquid to a gas?
The distance increases, as the particles become more energetic and the substance loses its definite volume, as the particles bounce around, due to heat/increased energy.
What effect does the speed of molecules have of matter?
The speed of the particles in a substance changes when the temperature changes. Heating the substance causes the particles to speed up, while cooling causes the particles to slow down.
How does the arrangement and movement of particles change as a substance changes from a liquid to a gas and solid to a liquid?
From a liquid to a gas, the particles become more spread out and move slower. From a solid to a liquid, the particles also become more spread out and move slower.
What is always a characteristic of a chemical change but not always a characteristic of a physical change?
When a chemical change takes place, the chemical structure of particles involved changes (i.e. one or more new substances are formed). In a physical change, the physical state of the particles involved changes (e.g. a solid melts and becomes a liquid). The chemical structure of the particles does not change, and no new substance is formed.
Describe how the motion and arrangements of particles change as a substance freezes?
The particles get so attracted to each other making them form into a solid
What happens to the particles when the substance changes shape?
yes! particles of a substance assume different shapes and sizes
The speed of the particles in a substance change when what changes?
electrons
Is the speed of the particles in a substance changes when the temperature changes?
Yes, in fact, particle movement is what heat is.
What happes to particles when a substance gains energy and changes state?
particals
How is the kinetic energy of the particles that make up a substance different after it changes?
If you mean by heating it... When you heat a substance, the thermal energy of its particles increases. This means that the particles will move around faster as they have a higher kinetic energy.
What happens to the distance between particles of a substance as it changes from a liquid to a gas?
The distance increases, as the particles become more energetic and the substance loses its definite volume, as the particles bounce around, due to heat/increased energy.
Does a liquid turn into gas when the particles get colder?
No, a substance changes from gas to liquid to solid as it cools.
How does adding energy to matter by heating it affect the energy of its particles?
Adding heat will do one of the following, or both: * The temperature of the substance increases. The individual particles move faster; their kinetic energy increases. * The substance changes its state (for example, when ice melts, it changes from solid to liquid). The potential energy of the particles increases.
Can you increase the number of particles of a substance in a chemical reaction?
In some electrochemical reactions the no. of particles automatically changes because of association and dissociation in solution
Heat is what in motion?
As energy is added to a substance, the particles that make up the substance vibrate faster. This is what causes substances to change state (solid to liquid to gas). As the particles move faster, the structure changes.
Has thermal energy been transfered into or out of a substance if the average kinetic energy changes?
Temperature is a measure of the average KE of the PARTICLES of a substance. So if the temperature changes, ave KE changes, thus thermal energy will have been transferred.
