Connect Properties to Particles - Middle School Physical Science
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Identify whether this is physical or chemical: iron rusts and becomes a new brittle solid.
Identify whether this is physical or chemical: iron rusts and becomes a new brittle solid.
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Chemical change; atoms rearranged to form new substances (iron oxide). Iron atoms bond with oxygen to form new compound.
Chemical change; atoms rearranged to form new substances (iron oxide). Iron atoms bond with oxygen to form new compound.
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What does a substance’s high boiling point indicate about particle attractions?
What does a substance’s high boiling point indicate about particle attractions?
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Strong attractions between particles require more energy to separate. More energy needed to overcome stronger intermolecular forces.
Strong attractions between particles require more energy to separate. More energy needed to overcome stronger intermolecular forces.
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What does a low melting point indicate about the strength of particle attractions?
What does a low melting point indicate about the strength of particle attractions?
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Weak attractions; particles separate into a liquid with less energy. Less energy needed to overcome weaker intermolecular forces.
Weak attractions; particles separate into a liquid with less energy. Less energy needed to overcome weaker intermolecular forces.
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What particle-level change explains why heating a solid causes it to expand?
What particle-level change explains why heating a solid causes it to expand?
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Particles vibrate faster and average spacing between them increases. Increased kinetic energy pushes particles farther apart.
Particles vibrate faster and average spacing between them increases. Increased kinetic energy pushes particles farther apart.
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What particle-level change explains why heating a gas increases its pressure in a sealed container?
What particle-level change explains why heating a gas increases its pressure in a sealed container?
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Faster particles collide more often and harder with container walls. Higher kinetic energy increases collision force and frequency.
Faster particles collide more often and harder with container walls. Higher kinetic energy increases collision force and frequency.
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What does high density usually indicate about particle spacing in a material?
What does high density usually indicate about particle spacing in a material?
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Particles are packed closely together with little empty space. More mass per unit volume due to tight packing.
Particles are packed closely together with little empty space. More mass per unit volume due to tight packing.
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What does low density usually indicate about particle spacing in a material?
What does low density usually indicate about particle spacing in a material?
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Particles are farther apart with more empty space between them. Less mass per unit volume due to loose packing.
Particles are farther apart with more empty space between them. Less mass per unit volume due to loose packing.
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What particle-level property best explains why metals conduct electricity well?
What particle-level property best explains why metals conduct electricity well?
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Mobile (delocalized) electrons move through the metal lattice. Free electrons carry charge through the material.
Mobile (delocalized) electrons move through the metal lattice. Free electrons carry charge through the material.
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What particle-level feature explains why ionic compounds conduct electricity only when molten or dissolved?
What particle-level feature explains why ionic compounds conduct electricity only when molten or dissolved?
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Ions become free to move; in solids ions are fixed in a lattice. Solid lattice locks ions; melting/dissolving frees them.
Ions become free to move; in solids ions are fixed in a lattice. Solid lattice locks ions; melting/dissolving frees them.
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What does brittleness in an ionic crystal indicate about particle arrangement under stress?
What does brittleness in an ionic crystal indicate about particle arrangement under stress?
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Shifts align like charges, causing strong repulsion and cracking. Stress causes like charges to align and repel.
Shifts align like charges, causing strong repulsion and cracking. Stress causes like charges to align and repel.
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Which statement best matches conservation of mass in a closed reaction at the particle level?
Which statement best matches conservation of mass in a closed reaction at the particle level?
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Atoms are not created or destroyed; they are rearranged into new molecules. Total mass conserved because atoms only rearrange.
Atoms are not created or destroyed; they are rearranged into new molecules. Total mass conserved because atoms only rearrange.
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What does malleability in metals indicate about particle-level bonding?
What does malleability in metals indicate about particle-level bonding?
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Metal ions can slide while electrons keep the structure bonded. Electron sea maintains bonding during deformation.
Metal ions can slide while electrons keep the structure bonded. Electron sea maintains bonding during deformation.
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What does a substance dissolving in water indicate at the particle level?
What does a substance dissolving in water indicate at the particle level?
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Water particles separate and surround solute particles (solvation). Polar water molecules attract and surround solute particles.
Water particles separate and surround solute particles (solvation). Polar water molecules attract and surround solute particles.
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Which particle-level rule best predicts solubility: “like dissolves like” means what?
Which particle-level rule best predicts solubility: “like dissolves like” means what?
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Polar dissolves polar; nonpolar dissolves nonpolar. Similar intermolecular forces allow mixing.
Polar dissolves polar; nonpolar dissolves nonpolar. Similar intermolecular forces allow mixing.
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Identify the correct particle-level meaning of diffusion (for example, perfume spreading).
Identify the correct particle-level meaning of diffusion (for example, perfume spreading).
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Random particle motion spreads particles from high to low concentration. Kinetic energy causes net movement down concentration gradient.
Random particle motion spreads particles from high to low concentration. Kinetic energy causes net movement down concentration gradient.
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What does a temperature plateau during melting on a heating curve indicate at the particle level?
What does a temperature plateau during melting on a heating curve indicate at the particle level?
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Energy breaks attractions; temperature stays constant during phase change. Added energy goes to breaking bonds, not raising temperature.
Energy breaks attractions; temperature stays constant during phase change. Added energy goes to breaking bonds, not raising temperature.
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What does a new color forming during a reaction most strongly suggest at the particle level?
What does a new color forming during a reaction most strongly suggest at the particle level?
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New substances formed; atoms rearranged into new molecules or ions. Color change often indicates new chemical bonds formed.
New substances formed; atoms rearranged into new molecules or ions. Color change often indicates new chemical bonds formed.
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What does gas bubbling that starts during mixing (not boiling) most strongly suggest at the particle level?
What does gas bubbling that starts during mixing (not boiling) most strongly suggest at the particle level?
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A chemical reaction produced a gas (new particles formed). Gas formation indicates new chemical products.
A chemical reaction produced a gas (new particles formed). Gas formation indicates new chemical products.
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What does formation of a precipitate (solid) when two solutions mix indicate at the particle level?
What does formation of a precipitate (solid) when two solutions mix indicate at the particle level?
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Ions combined into an insoluble compound (new solid particle lattice). Dissolved ions recombine into solid crystal structure.
Ions combined into an insoluble compound (new solid particle lattice). Dissolved ions recombine into solid crystal structure.
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Identify whether this is physical or chemical: ice melts and the mass stays the same.
Identify whether this is physical or chemical: ice melts and the mass stays the same.
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Physical change; particles are the same substance, only rearranged. Same $H_2O$ molecules, just different arrangement.
Physical change; particles are the same substance, only rearranged. Same $H_2O$ molecules, just different arrangement.
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Identify the most likely cause at the particle level: two clear liquids form a cloudy mixture instantly.
Identify the most likely cause at the particle level: two clear liquids form a cloudy mixture instantly.
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An insoluble solid formed (precipitation due to ion rearrangement). Clear solutions react to form insoluble particles causing cloudiness.
An insoluble solid formed (precipitation due to ion rearrangement). Clear solutions react to form insoluble particles causing cloudiness.
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Which observation best supports bond breaking and forming: phase change, size change, or light emitted?
Which observation best supports bond breaking and forming: phase change, size change, or light emitted?
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Light emitted. Light emission indicates energy release from bond rearrangement.
Light emitted. Light emission indicates energy release from bond rearrangement.
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Identify the particle-level meaning: a solid dissolves and the solution conducts electricity strongly.
Identify the particle-level meaning: a solid dissolves and the solution conducts electricity strongly.
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The solute formed mobile ions in solution. Ionic compounds dissociate into charged particles that conduct electricity.
The solute formed mobile ions in solution. Ionic compounds dissociate into charged particles that conduct electricity.
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Choose the correct interpretation: a substance has a sharp melting point and then becomes a liquid.
Choose the correct interpretation: a substance has a sharp melting point and then becomes a liquid.
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Particles overcome intermolecular forces; chemical identity stays the same. Melting breaks intermolecular forces without changing molecular structure.
Particles overcome intermolecular forces; chemical identity stays the same. Melting breaks intermolecular forces without changing molecular structure.
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What does a change in pH during mixing most directly indicate at the particle level?
What does a change in pH during mixing most directly indicate at the particle level?
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The concentration of $ ext{H}^+$ or $ ext{OH}^-$ ions changed by reaction. pH changes when reactions produce or consume hydrogen/hydroxide ions.
The concentration of $ ext{H}^+$ or $ ext{OH}^-$ ions changed by reaction. pH changes when reactions produce or consume hydrogen/hydroxide ions.
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