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When physical changes occur in matter, the substance's state or appearance changes without altering its chemical composition. In contrast, chemical changes involve a modification in the substance's chemical composition, resulting in the formation of new substances.
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What does not always stay the same and can undergo physical and or chemical changes?
Matter can undergo physical changes, such as changing state from solid to liquid, or chemical changes where new substances are formed. These changes alter the properties of the matter but do not change the fundamental makeup of the atoms and molecules involved.
Is melting iron into liquid a chemical change?
Yes, melting iron into a liquid state is a physical change, not a chemical change. This process involves applying heat to change the state of the iron from solid to liquid, without altering its chemical composition.
Does gas always indicate a chemical change?
No, the presence of gas does not always indicate a chemical change. Gas can form due to physical processes such as evaporation or changes in temperature, without any chemical reactions taking place.
What kind of changes in substances are always physical changes?
The kinds of changes in substances that are always physical changes are changes in the state. This is the change from solid, to liquid and then to gas and the reverse.
Are changes in properties always evidence of a chemical change and why?
Changes in properties are not always evidence of a chemical change. Physical changes, such as changes in state (solid to liquid) or appearance, can occur without any change in the chemical composition of a substance. Chemical changes involve the rearrangement of atoms and result in the formation of new substances with different properties.
Is energy always involved in physical or chemical changes?
Yes
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.
What is always involved in physical or chemical change in matter?
Energy is always involved.
What does not always stay the same and can undergo physical and or chemical changes?
Matter can undergo physical changes, such as changing state from solid to liquid, or chemical changes where new substances are formed. These changes alter the properties of the matter but do not change the fundamental makeup of the atoms and molecules involved.
Are melting butter and melting ice cream are both physical change or chemical change?
They're both physical changes. Phase changes are always physical changes. Chemical changes only involve chemical reactions - a change in the identity of the substance. That's why phase changes are physical changes. Ice cream remains ice cream when it melts.
Are phase changes physical or chemical in nature?
Phase changes are physical changes in nature. They involve a change in the state of matter (solid, liquid, gas) rather than a change in the chemical composition of the substance. Heating or cooling a substance can trigger phase changes.
Is Matter always retains its original state?
No, matter can undergo physical or chemical changes that alter its original state. Physical changes, like melting or freezing, do not change the chemical composition of the matter, while chemical changes result in the formation of new substances with different properties.
What changes are always involved in chemical reactions?
In a chemical reaction, changes in the arrangement of atoms and bonds occur as new substances are formed. Additionally, changes in energy levels, such as absorption or release of heat or light, are also common in chemical reactions. Moreover, changes in properties, such as color, odor, or state of matter, can often be observed as a result of a chemical reaction.
Why is cutting hair a physical change?
Cutting hair is a physical change because the chemical composition of the hair remains the same before and after it is cut. The change is only in the physical appearance of the hair, not in its chemical structure.
Is melting iron into liquid a chemical change?
Yes, melting iron into a liquid state is a physical change, not a chemical change. This process involves applying heat to change the state of the iron from solid to liquid, without altering its chemical composition.
Is freezing water a physical or chemical change?
Freezing (melting, boiling, condensing) are always phycal changes (of matter)
Chemical Reactions always involved changes in chemical?
Yes. The chemicals (reactants) that undergo a chemical reaction react with each other and make new chemicals called the products.
