Physical And Chemical Change
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This document discusses the differences between physical and chemical changes. Physical changes alter the physical properties of a substance but do not change its chemical composition, such as changes in state from solid to liquid to gas. Chemical changes create new substances through chemical reactions that alter the molecular or atomic structure of the original substances. Examples of both physical and chemical changes are provided.
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Changes of matter
A physical change alters a substance's form or appearance but not its chemical composition, such as water freezing to ice. A chemical change creates new substances through molecular rearrangement, like iron rusting due to oxidation. Chemical changes can be identified by changes in properties such as density, melting point, or reactions producing gas.
Chemical Changes
A chemical change is a change where one or more new types of matter form as the original materials react and combine in new ways. Some signs that a chemical change has occurred include a change in color, gases being given off, or a change in temperature without external heating or cooling. Common examples of chemical changes provided are burning, rusting, wood ash being left after burning, and fruits or metals oxidizing and changing color when exposed to air.
Physical and chemical change
This document discusses the difference between physical and chemical changes. Physical changes involve alterations to a substance's physical properties like size, shape, or phase without changing its chemical composition. Examples given are melting ice, tearing paper, and blowing a balloon. Physical changes are reversible. Chemical changes result in new substances forming with different chemical compositions and properties. Examples of chemical changes include rusting iron, burning paper, and ripening fruits. Chemical changes are irreversible.
Conservation of Mass
Here are the steps to solve this practice problem:
A. C2H4 + 3O2 → 2CO2 + 2H2O
B. C2H4 = 28 g/mol, O2 = 32 g/mol, CO2 = 44 g/mol, H2O = 18 g/mol
C. If we want 2.25 mol CO2 and the ratio is 2:1, then we need 2.25 * 2 = 4.5 mol C2H4
4.5 mol C2H4 * 28 g/mol = 126 g of C2H4
D. The ratio of H2O to O2 is 2:3. If we have 12 g
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Changes of matter
A physical change alters a substance's form or appearance but not its chemical composition, such as water freezing to ice. A chemical change creates new substances through molecular rearrangement, like iron rusting due to oxidation. Chemical changes can be identified by changes in properties such as density, melting point, or reactions producing gas.
Chemical Changes
A chemical change is a change where one or more new types of matter form as the original materials react and combine in new ways. Some signs that a chemical change has occurred include a change in color, gases being given off, or a change in temperature without external heating or cooling. Common examples of chemical changes provided are burning, rusting, wood ash being left after burning, and fruits or metals oxidizing and changing color when exposed to air.
Physical and chemical change
This document discusses the difference between physical and chemical changes. Physical changes involve alterations to a substance's physical properties like size, shape, or phase without changing its chemical composition. Examples given are melting ice, tearing paper, and blowing a balloon. Physical changes are reversible. Chemical changes result in new substances forming with different chemical compositions and properties. Examples of chemical changes include rusting iron, burning paper, and ripening fruits. Chemical changes are irreversible.
Conservation of Mass
Here are the steps to solve this practice problem:
A. C2H4 + 3O2 → 2CO2 + 2H2O
B. C2H4 = 28 g/mol, O2 = 32 g/mol, CO2 = 44 g/mol, H2O = 18 g/mol
C. If we want 2.25 mol CO2 and the ratio is 2:1, then we need 2.25 * 2 = 4.5 mol C2H4
4.5 mol C2H4 * 28 g/mol = 126 g of C2H4
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Physical and chemical changes
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Chemical properties
Chemical properties describe how a substance reacts or changes during a chemical reaction. Some key chemical properties include flammability, reactivity, and the ability to undergo chemical changes that alter the composition of the substance. Common signs that a chemical change has occurred include a change in color, production of a gas, or formation of a precipitate. However, physical changes can sometimes exhibit similar signs, so the only definitive way to identify a chemical change is if the composition of the substance changes to form new substances.
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A physical change is reversible and does not alter the chemical composition of a substance. Examples include water changing between liquid, solid, and gas states or wood being shaped into a baseball bat, as it remains chemically wood. A chemical change is irreversible and produces substances with different chemical compositions, such as wood burning to ash or bread toasting. Some changes can be either physical or chemical depending on conditions, and determining the type of change may require microscopic examination, with chemical changes generally producing substances that cannot be changed back to their original form.
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- Interference - When two light waves meet, they can constructively or destructively interfere based on how their crests and troughs align.
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