- Maya stirred a sugar cube into hot tea; soon the cube disappeared from view. What happened to the sugar particles?
Answer: The particles still exist and spread throughout the tea.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When sugar dissolves in hot tea, the solid sugar particles separate from each other and spread throughout the liquid, becoming too small and dispersed to see individually—but they still exist, which is why the tea tastes sweet. Choice A is correct because it accurately states that the particles still exist and spread throughout the tea, demonstrating understanding that dissolving is a physical change where particles are conserved, not destroyed. Choices B, C, and D represent misconceptions that particles can be destroyed, shrink away to nothing, or create empty spaces, failing to recognize that dissolved particles are simply dispersed but still present. To help students: Demonstrate by having them taste plain water versus sugar water—even though they can't see sugar particles in either, the sweet taste proves sugar particles are present and spread throughout the solution.
- Maya stirred salt into water; the salt crystals disappeared from view. Where did the salt particles go?
Answer: The particles still exist and spread throughout the water.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When salt dissolves in water, the salt crystals break apart into individual salt particles that spread throughout the water—they're too small to see individually but still present, which is why the water tastes salty. Choice B is correct because it accurately states that the particles still exist and spread throughout the water, demonstrating understanding that dissolving is a physical change where particles separate and disperse but are not destroyed. Choice D represents the misconception that particles can be destroyed during dissolving, failing to understand that the number of particles remains constant even when they're no longer visible. To help students: Demonstrate salt dissolving in a sealed container to show mass is conserved. Use taste as evidence that invisible particles are still present—if particles were destroyed, the water wouldn't taste salty.
- After rain, Sofia saw a puddle; by sunny afternoon it disappeared—where are the water particles now?
Answer: The particles still exist and moved into the air as a gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When water seems to 'disappear' from a puddle, the particles don't actually vanish—they evaporate and move into the air as water vapor gas particles. The water particles are still water particles, just spread far apart in the air as an invisible gas rather than close together as visible liquid. Choice A is correct because it accurately states that the particles still exist and moved into the air as a gas, demonstrating understanding that particles are conserved during evaporation. Choices B and C represent the misconception that particles can be destroyed or turned into nothing, which occurs because students incorrectly think 'cannot see' equals 'does not exist.' Choice D shows the error of thinking water particles change into air particles, rather than understanding that water particles move into the air. To help students: Use a sealed plastic bag with wet paper towel to show water evaporating but mass staying constant, proving particles still exist even when invisible.
- Keisha stirred salt into soup until it seemed to disappear. Do the salt particles still exist after this?
Answer: The particles still exist and spread throughout the soup.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When salt dissolves in soup, the salt particles separate and spread throughout the liquid—they're invisible individually but still present, which is why the soup tastes salty. Choice A is correct because it accurately states that the particles still exist and spread throughout the soup, demonstrating understanding that dissolving conserves matter. Choice C represents the misconception that salt particles transform into soup particles, failing to understand that salt particles retain their identity when dissolved—they're just mixed with the soup particles, not changed into them. To help students: Use taste as evidence—if salt particles were destroyed or changed, the soup wouldn't taste salty. Demonstrate by evaporating some salted soup water to show salt crystals reappear.
- Marcus left a chunk of dry ice on a plate; later it was gone—what is true about its particles?
Answer: The particles still exist and moved into the air as a gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. Dry ice undergoes sublimation—changing directly from solid to gas without becoming liquid—so the carbon dioxide particles move from the solid chunk into the surrounding air as an invisible gas. Choice A is correct because it accurately states that the particles still exist and moved into the air as a gas, demonstrating understanding that sublimation is a change of state where particles spread apart but are conserved. Choices B, C, and D represent misconceptions that particles can be destroyed, turn into energy, or become nothing during sublimation. To help students: Place dry ice in a sealed, flexible container (like a sealed plastic bag) to show it inflates as solid becomes gas, proving particles still exist; explicitly teach that the absence of a liquid puddle doesn't mean particles vanished.
- Amir put a moth ball in a closet; weeks later it disappeared—what happened to the moth ball particles?
Answer: The particles still exist and moved into the air as gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When moth balls sublime over time, the solid particles don't disappear—they gradually change directly from solid to gas and spread into the air, which is why we can smell them throughout the closet even after the solid is gone. Choice B is correct because it accurately states that the particles still exist and moved into the air as gas, demonstrating understanding that sublimation preserves particles while changing their state from solid to gas. Choices A, C, and D represent misconceptions that particles can be absorbed and cease to exist, vanish when invisible, or transform into air particles—these errors occur because students don't understand that moth ball particles retain their chemical identity even when changing states and spreading through air. To help students: Compare a moth ball's mass over several days to show gradual loss as particles move to air, and teach that 'The moth ball particles were packed as a solid. Now they are spread through the closet air as gas, which is why we smell them.'
- Emma poured sugar into warm water; it disappeared from view—where are the sugar particles now?
Answer: The particles still exist and are spread throughout the water.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When sugar dissolves in warm water, the sugar particles separate from their crystal structure and spread between water particles—they become invisible individually but remain present, making the water taste sweet and proving their continued existence. Choice B is correct because it accurately states that the particles still exist and are spread throughout the water, demonstrating understanding that dissolving disperses particles without destroying them or changing their chemical identity. Choices A, C, and D represent misconceptions that sugar particles become nothing, are destroyed by stirring, or transform into water particles—these errors arise from students not understanding that dissolved substances retain their particle identity and that physical changes like dissolving don't create or destroy matter. To help students: Have them taste the sweet water as evidence sugar particles are present, and use filtration or evaporation to show dissolved substances can be recovered, proving particles existed throughout.
- Keisha spilled nail polish remover; five minutes later it was gone—where are the remover particles now?
Answer: The particles still exist and moved into the air as a gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When nail polish remover (acetone) evaporates, the liquid particles spread far apart and move into the air as gas particles—they still exist as acetone particles in the air, which is why we can smell them. Choice B is correct because it accurately states that the particles still exist and moved into the air as a gas, showing understanding that evaporation spreads particles apart without destroying them. Choices A, C, and D represent misconceptions that particles can be absorbed and cease to exist, be destroyed, or change into different types of particles. To help students: Have students wave their hand over spilled remover to feel cooling (evidence of evaporation) and smell the vapor (evidence particles still exist in air); use the teaching phrase 'particles move, they don't disappear.'
- Jamal stirred salt into water; the crystals disappeared from view and the water looked clear. Where did the salt particles go?
Answer: The particles still exist and spread throughout the water.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When salt dissolves in water, the salt crystals break apart into individual salt particles that spread throughout the water—too small to see but still present, which is why the water would taste salty. Choice A is correct because it accurately states that the particles still exist and spread throughout the water, demonstrating understanding that dissolving doesn't destroy particles but disperses them. Choices B, C, and D represent misconceptions that particles can be absorbed and cease to exist, vanish in clear water, or change into water particles, violating conservation of matter. To help students: Let water evaporate from salt water in a dish—when the water is gone, salt crystals reappear, proving the salt particles were present all along even when dissolved and invisible.
- Marcus placed a small piece of dry ice on a plate. It got smaller and smaller, and no liquid puddle formed; later, it was gone from view. When the dry ice disappeared, the particles...
Answer: The particles still exist and moved into the air as gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. Dry ice sublimes, changing directly from solid to gas without becoming liquid, so the particles move into the air as carbon dioxide gas, still existing but invisible. No puddle forms because it's sublimation, not melting. Choice A is correct because it states the particles still exist and moved into the air as gas, reflecting conservation during phase changes. Choice B represents the misconception that particles were destroyed, so the matter no longer exists. This arises from not understanding that 'disappeared' means changed state, not destruction. To help students: Demo dry ice in a sealed bottle to show gas production and mass conservation. Teach visibility doesn't equal existence, like air. Trace: 'The dry ice particles were in the solid. Now they are in the air as gas.' Watch for thoughts of particles becoming nothing.
- Emma used hand sanitizer; it felt wet, then disappeared from view—do the alcohol particles still exist?
Answer: The particles still exist and moved into the air as gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When hand sanitizer (containing alcohol) evaporates from skin, the alcohol particles don't vanish—they change from liquid to gas and move into the surrounding air, becoming too spread out to see but still present. Choice B is correct because it accurately states that the particles still exist and moved into the air as gas, demonstrating understanding that particles are conserved during evaporation. Choices A, C, and D represent misconceptions that particles can be absorbed and cease to exist separately, vanish when invisible, or transform into energy—these errors occur because students don't yet understand that particles maintain their identity even when changing states or locations. To help students: Have them smell the alcohol scent in the air after using hand sanitizer as evidence the particles still exist, and use sentence frames like 'The alcohol particles were on my hands. Now they are in the air around me.'
- Chen poured a small puddle of water onto a warm table outside. At first it was shiny and easy to see, but later the table looked dry. Do the water particles still exist after it disappeared?
Answer: The particles still exist and moved into the air as gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. The water evaporates due to warmth, particles becoming gas and entering the air, still existing but not as visible liquid. No destruction occurs; it's a phase change. Choice B is correct because it confirms the particles still exist and moved into the air as gas. Choice C represents the misconception that particles were destroyed, so they cannot be found anywhere. This error equates drying with annihilation. To help students: Use closed demos for evaporation to prove conservation. Stress unseen matter exists. Trace: 'The water particles were on the table. Now they are in the air.' Watch for energy or disappearance misconceptions.
- Emma stirred a sugar cube into hot tea until it vanished. What happened to the sugar particles?
Answer: The particles still exist and spread throughout the tea.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When sugar dissolves in tea, the solid sugar particles separate and spread throughout the liquid—they're too small and spread out to see individually, but they still exist, which is why the tea tastes sweet. Choice A is correct because it accurately states that the particles still exist and spread throughout the tea, demonstrating understanding that dissolving is a physical change where particles are conserved. Choice D represents the misconception that sugar particles transform into tea particles, failing to understand that sugar particles remain sugar particles even when dissolved—they're just mixed between the water particles. To help students: Use a demonstration where students dissolve sugar in water, then let the water evaporate to recover the sugar crystals, proving the particles were there all along. Have students use sentence frames: 'The sugar particles were in the cube. Now they are spread throughout the tea.'
- At first, Jamal saw a big water puddle on the driveway. The next day was sunny and warm, and by afternoon the driveway looked dry with no puddle. Where are the water particles now?
Answer: The particles still exist and moved into the air as gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When matter seems to 'disappear' (like water evaporating, sugar dissolving, or dry ice seeming to vanish), the particles don't actually vanish—they move to a new location or change their state. For example, when water evaporates, the liquid water particles spread far apart and move into the air as gas particles—they still exist, they've just moved from the puddle to the surrounding air and are now invisible as water vapor. Choice A is correct because it accurately states that the particles still exist and describes where they went or what state they're in (moved into the air as gas). This demonstrates understanding that particles are conserved—they cannot be created or destroyed during everyday changes like dissolving, evaporating, or subliming. Choice B represents the misconception that particles can be destroyed, so they no longer exist anywhere. This error occurs because students incorrectly think 'cannot see' equals 'does not exist,' or they don't yet understand conservation of matter at the particle level, or they believe that when something disappears from view it has ceased to exist entirely. To help students: Use closed-system demonstrations where possible (water evaporating in sealed plastic bag, dry ice in sealed bottle) to show that even when matter is no longer visible, the mass is conserved and particles are still present. Explicitly teach that 'cannot see' does not mean 'does not exist'—use examples like air (we can't see it but it's made of particles) or dissolved sugar (invisible but still makes water taste sweet). Have students trace particle pathways using sentence frames: 'The water particles were in the puddle. Now they are in the air.' Watch for: Students who think particles are destroyed when matter evaporates or dissolves, or who think particles change into fundamentally different particles (water particles becoming air particles instead of recognizing water particles are now in the air).
- Keisha spilled nail polish remover; soon it disappeared from view—where are the remover particles now?
Answer: The particles still exist but moved into the air as gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When nail polish remover (acetone) evaporates from a surface, the liquid particles don't vanish—they change to gas and move into the surrounding air, becoming invisible but still present, which is why we can smell the strong odor. Choice A is correct because it accurately states that the particles still exist but moved into the air as gas, demonstrating understanding that evaporation moves particles to a new location without destroying them. Choices B, C, and D represent misconceptions that particles are destroyed when surfaces dry, become nothing, or transform into energy—these errors arise because students equate drying with destruction rather than understanding it as particle movement from surface to air. To help students: Have them notice the lingering smell as evidence of particles in the air, and use closed containers to trap evaporated particles, showing they still exist by weighing before and after evaporation.
- Maya saw a shallow puddle on the sidewalk after rain. At first it covered a large area, but hours later it was gone from view. Which best explains what happened to the water particles?
Answer: The particles still exist and moved into the air as gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. The puddle evaporates, with water particles becoming gas and moving into the air, conserved but no longer visible as liquid. Sun and warmth speed this process. Choice B is correct because it explains the particles still exist and moved into the air as gas. Choice D represents the misconception that particles shrank until they disappeared from the world. This error confuses size with existence, not understanding gas dispersion. To help students: Use sealed bag evaporation demos for mass conservation. Emphasize unseen particles exist, like vapor. Trace: 'The water particles were in the puddle. Now they are in the air.' Watch for shrinking or absorption ideas.
- Amir put a moth ball in a closet; after weeks it disappeared from view. What is true about the moth ball particles?
Answer: The particles still exist and moved into the air as gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When moth balls slowly sublime over weeks, the solid particles change directly to gas and spread into the air—they still exist but are now dispersed as invisible vapor that creates the characteristic moth ball smell. Choice A is correct because it accurately states that the particles still exist and moved into the air as gas, demonstrating understanding that sublimation is a physical change that conserves matter. Choices B, C, and D represent misconceptions that particles can be destroyed, become nothing, or leave our world entirely, failing to recognize fundamental conservation of matter. To help students: Point out that we can still smell moth balls long after they've disappeared—this proves the particles are still present in the air as gas, reinforcing that matter changes form but is never destroyed.
- Emma rubbed hand sanitizer; after 30 seconds it disappeared from view and her hands felt dry. Which best explains what happened to the particles?
Answer: The particles still exist and moved into the air as gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When hand sanitizer (alcohol) evaporates from skin, the liquid alcohol particles spread far apart and move into the surrounding air as gas—they still exist but are now invisible vapor mixed with air molecules. Choice A is correct because it accurately states that the particles still exist and moved into the air as gas, demonstrating understanding that evaporation is a physical change that conserves matter. Choices B, C, and D represent misconceptions that particles can be absorbed and cease to exist, turn into nothing, or change into air particles, violating conservation of matter. To help students: Have them cup their hands around their nose after using hand sanitizer—the alcohol smell proves that alcohol particles are still present in the air, reinforcing that evaporation moves particles but doesn't destroy them.
- Marcus left dry ice on a plate; it got smaller and disappeared—what is true about its particles?
Answer: The particles still exist and moved into the air as gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When dry ice sublimes (changes directly from solid to gas), the carbon dioxide particles don't disappear—they spread into the air as an invisible gas, moving from a tightly packed solid arrangement to widely spaced gas particles. Choice B is correct because it accurately states that the particles still exist and moved into the air as gas, demonstrating understanding that sublimation conserves particles while changing their state and location. Choices A, C, and D represent misconceptions that particles can shrink out of existence, be destroyed, or leave our world—these errors occur because students don't understand that state changes preserve particle identity and quantity, or they think matter can simply cease to exist. To help students: Place dry ice in a sealed clear bottle to show fog forming inside, proving the particles still exist as gas, and use the teaching phrase 'The CO2 particles were packed together as solid. Now they are spread apart in the air as gas.'
- Sofia saw a puddle in the morning; after a sunny day it disappeared. The particles of the water that were there...
Answer: The particles still exist and are now mixed in the air as gas.
This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When sunlight provides energy for evaporation, water particles gain enough energy to escape the puddle and move into the air as water vapor—they haven't been destroyed, just relocated to the atmosphere where they're invisible. Choice A is correct because it accurately states that the particles still exist and are now mixed in the air as gas, demonstrating understanding that evaporation is a physical change that conserves particles. Choice D represents the misconception that sunlight can destroy particles, failing to understand that energy causes particles to move and change state but cannot destroy them. To help students: Use a sealed plastic bag with wet paper towel in sunlight to show water vapor collecting on the bag—proof that particles still exist. Emphasize that sunlight provides energy for particles to move, not energy to destroy them.
