Why Some Mixtures Make Substances - 5th Grade Science
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What is the key particle-level idea that explains a new substance forming in a reaction?
What is the key particle-level idea that explains a new substance forming in a reaction?
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Atoms rearrange to make different molecules. Chemical reactions involve breaking and forming new bonds.
Atoms rearrange to make different molecules. Chemical reactions involve breaking and forming new bonds.
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What is a precipitate?
What is a precipitate?
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A solid that forms when two liquids react and a new substance forms. The solid is a new compound formed by the reaction.
A solid that forms when two liquids react and a new substance forms. The solid is a new compound formed by the reaction.
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Which option is most likely a physical change: rusting iron, burning wood, or melting ice?
Which option is most likely a physical change: rusting iron, burning wood, or melting ice?
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Melting ice. Ice changes state but remains water molecules ($H_2O$).
Melting ice. Ice changes state but remains water molecules ($H_2O$).
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Which option is a sign that a new substance may have formed: heat/light produced, cutting, or freezing?
Which option is a sign that a new substance may have formed: heat/light produced, cutting, or freezing?
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Heat or light produced. Energy release signals chemical bonds breaking and forming.
Heat or light produced. Energy release signals chemical bonds breaking and forming.
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Which option is a sign that a new substance may have formed: gas bubbles, dissolving, or melting?
Which option is a sign that a new substance may have formed: gas bubbles, dissolving, or melting?
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Gas bubbles. Gas formation indicates a chemical reaction producing new substances.
Gas bubbles. Gas formation indicates a chemical reaction producing new substances.
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Which option is a sign that a new substance may have formed: color change, stirring, or pouring?
Which option is a sign that a new substance may have formed: color change, stirring, or pouring?
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Color change. New substances often have different colors than the originals.
Color change. New substances often have different colors than the originals.
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What is the main reason many mixtures do not create new substances?
What is the main reason many mixtures do not create new substances?
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The substances do not chemically react; they only mix physically. No bond breaking occurs; substances simply intermingle.
The substances do not chemically react; they only mix physically. No bond breaking occurs; substances simply intermingle.
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What is the main reason some mixtures create new substances?
What is the main reason some mixtures create new substances?
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The substances undergo a chemical reaction. Chemical bonds break and reform, creating new molecular structures.
The substances undergo a chemical reaction. Chemical bonds break and reform, creating new molecular structures.
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Which statement best distinguishes mixing from reacting?
Which statement best distinguishes mixing from reacting?
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Mixing is physical; reacting is chemical and forms new substances. Physical mixing preserves original substances; reactions create new ones.
Mixing is physical; reacting is chemical and forms new substances. Physical mixing preserves original substances; reactions create new ones.
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What is a physical change?
What is a physical change?
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A change in form or state that does not make a new substance. Only appearance changes; the substance's identity remains the same.
A change in form or state that does not make a new substance. Only appearance changes; the substance's identity remains the same.
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What is a chemical change?
What is a chemical change?
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A change that forms one or more new substances. Atoms rearrange to create different molecules with new properties.
A change that forms one or more new substances. Atoms rearrange to create different molecules with new properties.
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What is a mixture in science?
What is a mixture in science?
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A physical combination of substances with no new substance formed. Components retain their original properties and can be separated.
A physical combination of substances with no new substance formed. Components retain their original properties and can be separated.
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Which option best describes dissolving sugar in water: chemical change or physical change?
Which option best describes dissolving sugar in water: chemical change or physical change?
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Physical change. Sugar molecules disperse but remain chemically unchanged.
Physical change. Sugar molecules disperse but remain chemically unchanged.
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Which option best describes mixing sand and iron filings: chemical change or physical change?
Which option best describes mixing sand and iron filings: chemical change or physical change?
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Physical change. Both substances retain their properties and can be separated.
Physical change. Both substances retain their properties and can be separated.
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Which option best describes vinegar reacting with baking soda: chemical change or physical change?
Which option best describes vinegar reacting with baking soda: chemical change or physical change?
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Chemical change. Acid-base reaction produces carbon dioxide and new compounds.
Chemical change. Acid-base reaction produces carbon dioxide and new compounds.
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Identify the best conclusion: A mixture fizzes and releases gas. Did a new substance likely form?
Identify the best conclusion: A mixture fizzes and releases gas. Did a new substance likely form?
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Yes, a new substance likely formed. Gas production is a key indicator of chemical reaction.
Yes, a new substance likely formed. Gas production is a key indicator of chemical reaction.
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Identify the best conclusion: Two liquids are mixed and a solid appears. Did a new substance form?
Identify the best conclusion: Two liquids are mixed and a solid appears. Did a new substance form?
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Yes, a precipitate indicates a new substance formed. Solid formation from liquids indicates chemical reaction occurred.
Yes, a precipitate indicates a new substance formed. Solid formation from liquids indicates chemical reaction occurred.
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Which option is most likely a chemical change: tearing paper, boiling water, or souring milk?
Which option is most likely a chemical change: tearing paper, boiling water, or souring milk?
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Souring milk. Bacteria convert lactose into lactic acid, a new substance.
Souring milk. Bacteria convert lactose into lactic acid, a new substance.
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Which statement is always true for a mixture that did not react chemically?
Which statement is always true for a mixture that did not react chemically?
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Each substance keeps its own properties. No chemical reaction means no property changes occur.
Each substance keeps its own properties. No chemical reaction means no property changes occur.
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Which option best describes why filtering can separate sand from water but not salt from water?
Which option best describes why filtering can separate sand from water but not salt from water?
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Sand is insoluble; dissolved salt passes through the filter. Particle size determines what passes through filter pores.
Sand is insoluble; dissolved salt passes through the filter. Particle size determines what passes through filter pores.
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