Explain Matter is Conserved - 5th Grade Science
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What measurement is most often used as evidence that matter is conserved in an investigation?
What measurement is most often used as evidence that matter is conserved in an investigation?
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Mass (measured with a balance). Mass directly measures the amount of matter present.
Mass (measured with a balance). Mass directly measures the amount of matter present.
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What conclusion is supported if a sealed bag has mass $50\text{ g}$ before and $50\text{ g}$ after mixing?
What conclusion is supported if a sealed bag has mass $50\text{ g}$ before and $50\text{ g}$ after mixing?
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Matter was conserved in the closed system. Equal masses before and after prove no matter was lost or gained.
Matter was conserved in the closed system. Equal masses before and after prove no matter was lost or gained.
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What does it mean to say matter is conserved during a physical or chemical change?
What does it mean to say matter is conserved during a physical or chemical change?
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Total mass stays the same; matter is not created or destroyed. Matter cannot be created or destroyed, only transformed.
Total mass stays the same; matter is not created or destroyed. Matter cannot be created or destroyed, only transformed.
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Which option is a chemical change: dissolving sugar or rusting iron?
Which option is a chemical change: dissolving sugar or rusting iron?
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Rusting iron. Chemical changes create new substances with different properties.
Rusting iron. Chemical changes create new substances with different properties.
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What is the expected mass change in a closed system after a change if matter is conserved?
What is the expected mass change in a closed system after a change if matter is conserved?
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No change; initial mass equals final mass. Conservation means total mass remains constant.
No change; initial mass equals final mass. Conservation means total mass remains constant.
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Identify the best tool to measure mass before and after a change to test conservation of matter.
Identify the best tool to measure mass before and after a change to test conservation of matter.
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A balance (such as a digital scale). Balances precisely measure mass in grams or kilograms.
A balance (such as a digital scale). Balances precisely measure mass in grams or kilograms.
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What does it indicate if the mass decreases in an open system during a change that makes a gas?
What does it indicate if the mass decreases in an open system during a change that makes a gas?
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Matter likely escaped the system (gas left). Open systems allow gases to escape, reducing total mass.
Matter likely escaped the system (gas left). Open systems allow gases to escape, reducing total mass.
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What does it indicate if the mass increases in an open system during a change?
What does it indicate if the mass increases in an open system during a change?
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Matter likely entered the system (for example, gas from air). Open systems allow matter exchange with surroundings.
Matter likely entered the system (for example, gas from air). Open systems allow matter exchange with surroundings.
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Which statement best distinguishes a closed system from an open system in mass investigations?
Which statement best distinguishes a closed system from an open system in mass investigations?
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Closed: no matter enters or leaves; open: matter can enter or leave. Key difference is whether matter can cross system boundaries.
Closed: no matter enters or leaves; open: matter can enter or leave. Key difference is whether matter can cross system boundaries.
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Which option is a physical change: melting ice or burning paper?
Which option is a physical change: melting ice or burning paper?
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Melting ice. Physical changes alter form but not chemical composition.
Melting ice. Physical changes alter form but not chemical composition.
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Choose the correct comparison for conservation of matter: $m_\text{before}$ ___ $m_\text{after}$ in a closed system.
Choose the correct comparison for conservation of matter: $m_\text{before}$ ___ $m_\text{after}$ in a closed system.
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$m_\text{before} = m_\text{after}$. Conservation requires mass equality before and after changes.
$m_\text{before} = m_\text{after}$. Conservation requires mass equality before and after changes.
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What should be included in the mass measurement when testing conservation in a sealed bag reaction?
What should be included in the mass measurement when testing conservation in a sealed bag reaction?
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All contents plus the container (bag) each time. Container mass must be included for accurate total measurement.
All contents plus the container (bag) each time. Container mass must be included for accurate total measurement.
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Which option is the best way to prevent loss of matter when heating causes evaporation?
Which option is the best way to prevent loss of matter when heating causes evaporation?
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Use a covered or sealed container to keep vapor inside. Sealing prevents water vapor from escaping during heating.
Use a covered or sealed container to keep vapor inside. Sealing prevents water vapor from escaping during heating.
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Identify the best evidence statement for conservation: “The mass was the same before and after in a sealed bag.”
Identify the best evidence statement for conservation: “The mass was the same before and after in a sealed bag.”
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Equal mass before and after in a closed system supports conservation of matter. This directly demonstrates the law of conservation of matter.
Equal mass before and after in a closed system supports conservation of matter. This directly demonstrates the law of conservation of matter.
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Find the final mass: In a closed system, initial mass is $150\text{ g}$. What is the final mass?
Find the final mass: In a closed system, initial mass is $150\text{ g}$. What is the final mass?
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$150\text{ g}$. Closed systems maintain constant mass throughout any change.
$150\text{ g}$. Closed systems maintain constant mass throughout any change.
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What total mass should be measured after combining $30\text{ g}$ and $45\text{ g}$ in a sealed container?
What total mass should be measured after combining $30\text{ g}$ and $45\text{ g}$ in a sealed container?
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$75\text{ g}$. Add masses: $30\text{ g} + 45\text{ g} = 75\text{ g}$ total.
$75\text{ g}$. Add masses: $30\text{ g} + 45\text{ g} = 75\text{ g}$ total.
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Choose the correct conclusion: A sealed flask is $200\text{ g}$ before and $201\text{ g}$ after. What is most likely?
Choose the correct conclusion: A sealed flask is $200\text{ g}$ before and $201\text{ g}$ after. What is most likely?
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Measurement error; mass should stay constant in a closed system. Small differences suggest scale precision limits, not actual change.
Measurement error; mass should stay constant in a closed system. Small differences suggest scale precision limits, not actual change.
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Identify the best claim if mass changes from $80\text{ g}$ to $76\text{ g}$ in an open cup during bubbling.
Identify the best claim if mass changes from $80\text{ g}$ to $76\text{ g}$ in an open cup during bubbling.
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Matter escaped as gas; the system was open. Mass decrease indicates gas bubbles escaped the open container.
Matter escaped as gas; the system was open. Mass decrease indicates gas bubbles escaped the open container.
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What is the mass change if a closed container is $120\text{ g}$ before and $120\text{ g}$ after a reaction?
What is the mass change if a closed container is $120\text{ g}$ before and $120\text{ g}$ after a reaction?
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$0\text{ g}$. Subtract: $120\text{ g} - 120\text{ g} = 0\text{ g}$ change.
$0\text{ g}$. Subtract: $120\text{ g} - 120\text{ g} = 0\text{ g}$ change.
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Which system must be used to show conservation of matter when a gas might be produced?
Which system must be used to show conservation of matter when a gas might be produced?
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A closed system (sealed container). Prevents gas from escaping, ensuring all matter stays inside.
A closed system (sealed container). Prevents gas from escaping, ensuring all matter stays inside.
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