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Resistivity can be affected by several physical properties, including temperature, impurities, and structural defects within a material. As temperature increases, the resistivity of conductors typically rises due to increased atomic vibrations that hinder electron flow. In contrast, semiconductors may exhibit decreased resistivity with rising temperature due to enhanced carrier mobility. Additionally, the presence of impurities or defects can disrupt the lattice structure, leading to changes in resistivity by altering the number of charge carriers or scattering mechanisms.
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Do chemical changes affect the chemical structure of a substance?
Yes, chemical changes result in a change in the chemical structure of a substance. During a chemical change, new substances with different chemical compositions are formed through the rearrangement of atoms and bonds. This is in contrast to physical changes, where the chemical structure remains the same even though the physical properties may change.
Do the physical properties of water change when a compound is dissolved in water?
Yes, the physical properties of water can change when a compound is dissolved in it. For example, the boiling and freezing points of water can be altered, its density may change, and its ability to conduct electricity may be affected depending on the compound dissolved.
Is a piece of metal is bent in half a chemical change?
It is a physical change because only its shape changed, not its chemical composition.
Is pounding and shaping horeshoe a chemical or physical change?
Pounding and shaping a horseshoe is a physical change. This process involves altering the shape and size of the metal without changing its chemical composition. The properties of the metal, such as its structure and appearance, may change, but the material itself remains the same. Thus, it is classified as a physical change.
What kind of change happens when the composition of a substance does not change?
A physical change occurs when the composition of a substance does not change. This means the substance retains its chemical identity but may undergo a change in its physical properties like shape, size, or state of matter. Examples include melting, freezing, boiling, or dissolving.
What are 6 physical properties a physical substance may posses?
Examples: density, thermal conductivity, electrical resistivity, thermal expansion, ductility, malleability, hardness etc.
How are physical properties differ from physical changes?
Physical properties describe characteristics of a substance that do not involve a change in its chemical composition, such as color or density. Physical changes, on the other hand, refer to alterations in the substance's physical state, like melting or boiling.
What happens to the chemical and physical properties of a substance formed in a chemical reaction?
The chemical properties of a substance change during a chemical reaction, meaning the substance undergoes a chemical change and forms new substances with different properties. The physical properties may also change, such as color, texture, or state of matter.
Do chemical changes affect the chemical structure of a substance?
Yes, chemical changes result in a change in the chemical structure of a substance. During a chemical change, new substances with different chemical compositions are formed through the rearrangement of atoms and bonds. This is in contrast to physical changes, where the chemical structure remains the same even though the physical properties may change.
What happens when a physical change does not go to completion?
When a physical change does not go to completion, there may be a partial alteration in the physical properties of the substance involved. This could result in a temporary or incomplete transformation, where some characteristics may change while others remain unchanged. Incomplete physical changes often mean that the substance retains some of its original properties or structure.
In a physical change some of the physical properties of the substance may be altered and the chemical composition?
In a physical change, the chemical composition of the substance remains the same, but some physical properties like shape, size, or state may change. This means that the substance can be reversed back to its original state without undergoing a chemical reaction.
When a physical change occurs in a sample of matter which is the matter that does not change?
During a physical change, the chemical composition of the matter remains the same, while its physical properties, such as shape, size, or state, may change. The individual particles that make up the matter do not change in a physical change.
What does not change when a substance changes matter?
The chemical composition of the substance does not change when it changes its state of matter. The arrangement of atoms and molecules may vary, but the elements present in the substance remain the same.
What happens when you mix two substances?
You get a mixture.
Do the physical properties of water change when a compound is dissolved in water?
Yes, the physical properties of water can change when a compound is dissolved in it. For example, the boiling and freezing points of water can be altered, its density may change, and its ability to conduct electricity may be affected depending on the compound dissolved.
What happens to the physical properties of substances when they are at room temperature?
At room temperature, the physical properties of substances can change. For example, some substances may melt, freeze, evaporate, or condense. These changes can affect properties like color, texture, and state of matter.
What is changed when matter undergoes a phisical change?
When matter undergoes a physical change, its state may change (solid to liquid, liquid to gas, etc.), its shape or size may change, or its physical properties such as density or volume may be altered. However, the chemical composition of the substance remains the same before and after the physical change.
