Reversing Heat and Cold - 2nd Grade Science
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Which option best describes toasting bread with heat: reversible or irreversible?
Which option best describes toasting bread with heat: reversible or irreversible?
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Irreversible. Heat causes chemical changes that brown and harden the bread permanently.
Irreversible. Heat causes chemical changes that brown and harden the bread permanently.
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What does reversible mean for a change caused by heating or cooling?
What does reversible mean for a change caused by heating or cooling?
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A change that can be changed back to the original state. The material returns to its original form through opposite temperature change.
A change that can be changed back to the original state. The material returns to its original form through opposite temperature change.
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Which option best describes melting chocolate and letting it harden again?
Which option best describes melting chocolate and letting it harden again?
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Reversible. Chocolate returns to solid form when cooled without chemical change.
Reversible. Chocolate returns to solid form when cooled without chemical change.
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Which option best describes condensing steam into water: reversible or irreversible?
Which option best describes condensing steam into water: reversible or irreversible?
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Reversible. Water vapor can be boiled again from the condensed liquid.
Reversible. Water vapor can be boiled again from the condensed liquid.
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Which option best describes boiling water into steam: reversible or irreversible?
Which option best describes boiling water into steam: reversible or irreversible?
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Reversible. Steam can condense back to liquid water when cooled.
Reversible. Steam can condense back to liquid water when cooled.
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Which option best describes freezing water into ice: reversible or irreversible?
Which option best describes freezing water into ice: reversible or irreversible?
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Reversible. Ice can melt back to water when warmed.
Reversible. Ice can melt back to water when warmed.
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Which option best describes melting ice into water: reversible or irreversible?
Which option best describes melting ice into water: reversible or irreversible?
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Reversible. Ice can refreeze back to solid after melting.
Reversible. Ice can refreeze back to solid after melting.
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What does irreversible mean for a change caused by heating or cooling?
What does irreversible mean for a change caused by heating or cooling?
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A change that cannot be changed back to the original state. The material permanently transforms and cannot return to its original form.
A change that cannot be changed back to the original state. The material permanently transforms and cannot return to its original form.
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Which option best describes freezing juice into a popsicle and then melting it back to juice?
Which option best describes freezing juice into a popsicle and then melting it back to juice?
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Reversible. Only water changes state; juice components remain unchanged.
Reversible. Only water changes state; juice components remain unchanged.
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Which option best describes melting a crayon and letting it cool into a solid again?
Which option best describes melting a crayon and letting it cool into a solid again?
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Reversible. Crayon wax only melts and solidifies without chemical change.
Reversible. Crayon wax only melts and solidifies without chemical change.
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Which option best describes drying wet clothes in the sun: reversible or irreversible?
Which option best describes drying wet clothes in the sun: reversible or irreversible?
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Reversible. Water evaporates but can be added back to wet the clothes again.
Reversible. Water evaporates but can be added back to wet the clothes again.
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Which option best describes warming butter until soft and then cooling until firm again?
Which option best describes warming butter until soft and then cooling until firm again?
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Reversible. Butter only changes texture with temperature, not chemical structure.
Reversible. Butter only changes texture with temperature, not chemical structure.
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Which option best describes burning paper with heat: reversible or irreversible?
Which option best describes burning paper with heat: reversible or irreversible?
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Irreversible. Fire causes chemical reactions that turn paper into ash and gases.
Irreversible. Fire causes chemical reactions that turn paper into ash and gases.
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Which option best describes melting candle wax and letting it cool back into wax?
Which option best describes melting candle wax and letting it cool back into wax?
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Reversible. Wax only changes physical state, not chemical composition.
Reversible. Wax only changes physical state, not chemical composition.
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Which statement best shows a reversible change: "It can return by heating or cooling" or "It makes a new substance"?
Which statement best shows a reversible change: "It can return by heating or cooling" or "It makes a new substance"?
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"It can return by heating or cooling.". Temperature changes can reverse physical state changes.
"It can return by heating or cooling.". Temperature changes can reverse physical state changes.
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