Analyze Property Changes - Middle School Physical Science
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What does formation of a precipitate indicate when two solutions are mixed?
What does formation of a precipitate indicate when two solutions are mixed?
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A chemical reaction produced an insoluble solid. Precipitates form when products have low solubility.
A chemical reaction produced an insoluble solid. Precipitates form when products have low solubility.
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Which change is described: iron reacting with oxygen to form rust (physical or chemical)?
Which change is described: iron reacting with oxygen to form rust (physical or chemical)?
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Chemical change. Iron oxide (rust) is a new substance with different properties.
Chemical change. Iron oxide (rust) is a new substance with different properties.
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A solid forms when two clear solutions are mixed. Identify the change type.
A solid forms when two clear solutions are mixed. Identify the change type.
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Chemical change. Precipitate formation indicates a new substance was created.
Chemical change. Precipitate formation indicates a new substance was created.
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A liquid is heated and boils, but the substance remains the same. Identify the change type.
A liquid is heated and boils, but the substance remains the same. Identify the change type.
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Physical change. Boiling is a state change, not a substance change.
Physical change. Boiling is a state change, not a substance change.
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A sealed bag inflates when two substances are mixed and bubbles appear. Identify the evidence shown.
A sealed bag inflates when two substances are mixed and bubbles appear. Identify the evidence shown.
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Gas production (chemical reaction evidence). Bubbles and bag inflation show gas is being produced.
Gas production (chemical reaction evidence). Bubbles and bag inflation show gas is being produced.
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A substance changes color after mixing and cannot be returned to the original by cooling. Identify the change type.
A substance changes color after mixing and cannot be returned to the original by cooling. Identify the change type.
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Chemical change. Irreversible color change indicates new substances formed.
Chemical change. Irreversible color change indicates new substances formed.
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Choose the best conclusion: mass before mixing is $50,\text{g}$ and after is $50,\text{g}$ in a closed system.
Choose the best conclusion: mass before mixing is $50,\text{g}$ and after is $50,\text{g}$ in a closed system.
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Mass is conserved; evidence supports a chemical reaction is possible. Mass conservation occurs in all changes; doesn't rule out reactions.
Mass is conserved; evidence supports a chemical reaction is possible. Mass conservation occurs in all changes; doesn't rule out reactions.
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Which conclusion fits this data: conductivity stays the same after melting and resolidifying a metal sample?
Which conclusion fits this data: conductivity stays the same after melting and resolidifying a metal sample?
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A physical change occurred; the substance remained the same. Conductivity depends on substance identity, which didn't change.
A physical change occurred; the substance remained the same. Conductivity depends on substance identity, which didn't change.
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What is the definition of a chemical property of a substance?
What is the definition of a chemical property of a substance?
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A characteristic describing ability to form new substances. Reactivity and transformation potential define chemical properties.
A characteristic describing ability to form new substances. Reactivity and transformation potential define chemical properties.
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Which type of change forms at least one new substance: physical or chemical?
Which type of change forms at least one new substance: physical or chemical?
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Chemical change. New substances with different properties form only in chemical changes.
Chemical change. New substances with different properties form only in chemical changes.
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Which observation is strongest evidence of a chemical reaction: color change, bubbles, or melting?
Which observation is strongest evidence of a chemical reaction: color change, bubbles, or melting?
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Bubbles (gas production). Gas formation indicates new substances are being produced.
Bubbles (gas production). Gas formation indicates new substances are being produced.
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What is the definition of a physical property of a substance?
What is the definition of a physical property of a substance?
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A characteristic observed/measured without changing the substance. No new substance forms when observing or measuring.
A characteristic observed/measured without changing the substance. No new substance forms when observing or measuring.
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Which type of change does not form a new substance and is often reversible?
Which type of change does not form a new substance and is often reversible?
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Physical change. The substance's identity remains unchanged in physical changes.
Physical change. The substance's identity remains unchanged in physical changes.
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What does emission of light (glow/flame) during interaction most likely indicate?
What does emission of light (glow/flame) during interaction most likely indicate?
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A chemical reaction released energy as light. Light emission occurs when excited electrons release energy.
A chemical reaction released energy as light. Light emission occurs when excited electrons release energy.
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What does an unexpected temperature change during mixing most likely indicate?
What does an unexpected temperature change during mixing most likely indicate?
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A chemical reaction released or absorbed energy. Energy changes accompany bond breaking and forming.
A chemical reaction released or absorbed energy. Energy changes accompany bond breaking and forming.
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What type of change forms at least one new substance with new properties?
What type of change forms at least one new substance with new properties?
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Chemical change. New substances have different chemical compositions and properties.
Chemical change. New substances have different chemical compositions and properties.
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Which option indicates an exothermic change: temperature increases, temperature decreases, or no change?
Which option indicates an exothermic change: temperature increases, temperature decreases, or no change?
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Temperature increases. Exothermic reactions release energy as heat to surroundings.
Temperature increases. Exothermic reactions release energy as heat to surroundings.
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Which option indicates an endothermic change: temperature increases, temperature decreases, or no change?
Which option indicates an endothermic change: temperature increases, temperature decreases, or no change?
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Temperature decreases. Endothermic reactions absorb energy from surroundings as heat.
Temperature decreases. Endothermic reactions absorb energy from surroundings as heat.
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Which method best shows whether mass is conserved: measure mass before and after in a closed system?
Which method best shows whether mass is conserved: measure mass before and after in a closed system?
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Measure mass before and after in a closed system. Closed systems prevent matter loss, allowing accurate mass comparison.
Measure mass before and after in a closed system. Closed systems prevent matter loss, allowing accurate mass comparison.
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Identify the change type: A solid forms when two clear solutions are mixed (a precipitate appears).
Identify the change type: A solid forms when two clear solutions are mixed (a precipitate appears).
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Chemical change. Precipitate formation indicates new substance creation from dissolved ions.
Chemical change. Precipitate formation indicates new substance creation from dissolved ions.
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Identify the change type: Water changes from liquid to gas when heated.
Identify the change type: Water changes from liquid to gas when heated.
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Physical change. State change from liquid to gas doesn't alter H₂O molecular structure.
Physical change. State change from liquid to gas doesn't alter H₂O molecular structure.
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Which term means a substance that is present at the start of a chemical reaction?
Which term means a substance that is present at the start of a chemical reaction?
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Reactant. These starting materials undergo transformation during the reaction.
Reactant. These starting materials undergo transformation during the reaction.
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Which term means a substance that is formed by a chemical reaction?
Which term means a substance that is formed by a chemical reaction?
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Product. These new substances result from rearranged atoms during the reaction.
Product. These new substances result from rearranged atoms during the reaction.
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Identify the change type: Vinegar and baking soda produce bubbles and the container feels cooler.
Identify the change type: Vinegar and baking soda produce bubbles and the container feels cooler.
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Chemical change. Bubbles (CO₂) and cooling show new products formed with energy absorption.
Chemical change. Bubbles (CO₂) and cooling show new products formed with energy absorption.
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Which option is a physical property: density, flammability, or reactivity with acid?
Which option is a physical property: density, flammability, or reactivity with acid?
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Density. Mass per volume is measurable without changing the substance's identity.
Density. Mass per volume is measurable without changing the substance's identity.
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