Physical and Chemical Changes - AP Chemistry
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Is chopping wood a physical or chemical change?
Is chopping wood a physical or chemical change?
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Physical change. Only size and shape change, not composition.
Physical change. Only size and shape change, not composition.
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Is souring milk a physical or chemical change?
Is souring milk a physical or chemical change?
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Chemical change. Bacteria produce acids that change milk composition.
Chemical change. Bacteria produce acids that change milk composition.
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Identify whether dissolving sugar in tea is a physical or chemical change.
Identify whether dissolving sugar in tea is a physical or chemical change.
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Physical change. Sugar molecules disperse but remain unchanged.
Physical change. Sugar molecules disperse but remain unchanged.
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Identify whether rusting iron is a physical or chemical change.
Identify whether rusting iron is a physical or chemical change.
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Chemical change. Iron reacts with oxygen to form iron oxide.
Chemical change. Iron reacts with oxygen to form iron oxide.
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Is chopping wood a physical or chemical change?
Is chopping wood a physical or chemical change?
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Physical change. Only size and shape change, not composition.
Physical change. Only size and shape change, not composition.
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Is souring milk a physical or chemical change?
Is souring milk a physical or chemical change?
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Chemical change. Bacteria produce acids that change milk composition.
Chemical change. Bacteria produce acids that change milk composition.
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What is combustion?
What is combustion?
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A chemical process of burning, involving oxygen and fuel. Oxidation reaction that releases energy as heat.
A chemical process of burning, involving oxygen and fuel. Oxidation reaction that releases energy as heat.
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Identify whether crushing a can is a physical or chemical change.
Identify whether crushing a can is a physical or chemical change.
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Physical change. Only shape changes, aluminum composition unchanged.
Physical change. Only shape changes, aluminum composition unchanged.
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What is a physical property?
What is a physical property?
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A characteristic that can be observed without changing substance identity. Observable without altering molecular composition.
A characteristic that can be observed without changing substance identity. Observable without altering molecular composition.
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Identify whether bending a metal rod is a physical or chemical change.
Identify whether bending a metal rod is a physical or chemical change.
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Physical change. Only shape changes, metal composition unchanged.
Physical change. Only shape changes, metal composition unchanged.
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Identify whether bleaching a stain is a physical or chemical change.
Identify whether bleaching a stain is a physical or chemical change.
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Chemical change. Bleach chemically alters the stain molecules.
Chemical change. Bleach chemically alters the stain molecules.
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What is a precipitate in a chemical reaction?
What is a precipitate in a chemical reaction?
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An insoluble solid formed from a solution. Forms when dissolved ions recombine and crystallize.
An insoluble solid formed from a solution. Forms when dissolved ions recombine and crystallize.
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Identify whether frying an egg is a physical or chemical change.
Identify whether frying an egg is a physical or chemical change.
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Chemical change. Heat denatures proteins in the egg.
Chemical change. Heat denatures proteins in the egg.
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What is sublimation?
What is sublimation?
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The transition of a substance from solid to gas without liquifying. Direct phase transition bypassing liquid phase.
The transition of a substance from solid to gas without liquifying. Direct phase transition bypassing liquid phase.
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Is freezing water a physical or chemical change?
Is freezing water a physical or chemical change?
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Physical change. Only state changes from liquid to solid.
Physical change. Only state changes from liquid to solid.
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What is a physical change?
What is a physical change?
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A change affecting the form but not the chemical composition. Only molecular arrangement changes, not identity.
A change affecting the form but not the chemical composition. Only molecular arrangement changes, not identity.
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Is breaking a glass a physical or chemical change?
Is breaking a glass a physical or chemical change?
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Physical change. Only shape changes, glass composition stays same.
Physical change. Only shape changes, glass composition stays same.
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Identify whether photosynthesis is a physical or chemical change.
Identify whether photosynthesis is a physical or chemical change.
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Chemical change. $CO_2$ and glucose form from light energy and reactants.
Chemical change. $CO_2$ and glucose form from light energy and reactants.
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What is deposition in terms of phase change?
What is deposition in terms of phase change?
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Gas to solid transition. Vapor condenses directly to solid state.
Gas to solid transition. Vapor condenses directly to solid state.
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Identify whether evaporating alcohol is a physical or chemical change.
Identify whether evaporating alcohol is a physical or chemical change.
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Physical change. Only state changes from liquid to gas.
Physical change. Only state changes from liquid to gas.
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What is the result of a chemical reaction?
What is the result of a chemical reaction?
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Formation of new substances with different properties. Products have different molecular structures than reactants.
Formation of new substances with different properties. Products have different molecular structures than reactants.
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What is the main difference between physical and chemical changes?
What is the main difference between physical and chemical changes?
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Physical changes do not alter chemical composition; chemical changes do. Chemical composition determines the type of change.
Physical changes do not alter chemical composition; chemical changes do. Chemical composition determines the type of change.
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What is combustion?
What is combustion?
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A chemical process of burning, involving oxygen and fuel. Oxidation reaction that releases energy as heat.
A chemical process of burning, involving oxygen and fuel. Oxidation reaction that releases energy as heat.
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What is the law of conservation of mass?
What is the law of conservation of mass?
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Mass is neither created nor destroyed in a chemical reaction. Total mass of reactants equals total mass of products.
Mass is neither created nor destroyed in a chemical reaction. Total mass of reactants equals total mass of products.
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Identify whether rusting iron is a physical or chemical change.
Identify whether rusting iron is a physical or chemical change.
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Chemical change. Iron reacts with oxygen to form iron oxide.
Chemical change. Iron reacts with oxygen to form iron oxide.
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Identify whether melting ice is a physical or chemical change.
Identify whether melting ice is a physical or chemical change.
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Physical change. Only state changes from solid to liquid.
Physical change. Only state changes from solid to liquid.
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What type of change is dissolving salt in water?
What type of change is dissolving salt in water?
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Physical change. Salt molecules disperse but remain chemically unchanged.
Physical change. Salt molecules disperse but remain chemically unchanged.
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What are indicators of a chemical change?
What are indicators of a chemical change?
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Color change, gas production, temperature change, precipitate formation. These signs indicate new substances are forming.
Color change, gas production, temperature change, precipitate formation. These signs indicate new substances are forming.
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Identify whether digestion of food is a physical or chemical change.
Identify whether digestion of food is a physical or chemical change.
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Chemical change. Enzymes break down molecules into new compounds.
Chemical change. Enzymes break down molecules into new compounds.
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Identify whether fermenting grapes is a physical or chemical change.
Identify whether fermenting grapes is a physical or chemical change.
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Chemical change. Sugars convert to alcohol through enzyme reactions.
Chemical change. Sugars convert to alcohol through enzyme reactions.
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