Plan Investigations Mixing Substances - 5th Grade Science
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What are controlled variables (constants) in a mixing investigation?
What are controlled variables (constants) in a mixing investigation?
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Factors kept the same for a fair test. Keeping them constant ensures only one variable affects results.
Factors kept the same for a fair test. Keeping them constant ensures only one variable affects results.
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What is the correct safety action if a chemical or mixture splashes into your eyes?
What is the correct safety action if a chemical or mixture splashes into your eyes?
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Rinse with water and tell an adult immediately. Quick action prevents serious eye damage from chemicals.
Rinse with water and tell an adult immediately. Quick action prevents serious eye damage from chemicals.
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What is the correct safety rule for tasting substances during mixing investigations?
What is the correct safety rule for tasting substances during mixing investigations?
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Never taste any lab substance. Lab substances may be toxic or harmful if ingested.
Never taste any lab substance. Lab substances may be toxic or harmful if ingested.
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Which tool is most appropriate to measure mass of a solid to be mixed: thermometer, balance, or stopwatch?
Which tool is most appropriate to measure mass of a solid to be mixed: thermometer, balance, or stopwatch?
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Balance. It accurately measures mass in grams for precise mixing.
Balance. It accurately measures mass in grams for precise mixing.
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Which tool is most appropriate to measure liquid volume for mixing: ruler, balance, or graduated cylinder?
Which tool is most appropriate to measure liquid volume for mixing: ruler, balance, or graduated cylinder?
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Graduated cylinder. It precisely measures liquid volumes in milliliters.
Graduated cylinder. It precisely measures liquid volumes in milliliters.
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What is the purpose of repeating trials in a mixing investigation?
What is the purpose of repeating trials in a mixing investigation?
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To increase reliability of results. Multiple trials help confirm results aren't due to chance.
To increase reliability of results. Multiple trials help confirm results aren't due to chance.
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What is a fair test when comparing how two solids dissolve in water?
What is a fair test when comparing how two solids dissolve in water?
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Change only the solid; keep all else constant. This isolates the solid type as the only variable affecting results.
Change only the solid; keep all else constant. This isolates the solid type as the only variable affecting results.
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Which question best tests how mixing affects dissolving: color, size, or stirring speed?
Which question best tests how mixing affects dissolving: color, size, or stirring speed?
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Stirring speed. Stirring directly affects how substances mix and dissolve.
Stirring speed. Stirring directly affects how substances mix and dissolve.
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Which variable should be controlled when testing how stirring affects dissolving?
Which variable should be controlled when testing how stirring affects dissolving?
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Temperature (keep it the same). Temperature affects dissolving rate, so it must stay constant.
Temperature (keep it the same). Temperature affects dissolving rate, so it must stay constant.
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Identify the dependent variable: you time how long sugar takes to dissolve when stirred at different speeds.
Identify the dependent variable: you time how long sugar takes to dissolve when stirred at different speeds.
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Time to dissolve. You're measuring how stirring speed affects this outcome.
Time to dissolve. You're measuring how stirring speed affects this outcome.
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Find the independent variable: you test $5,\text{g}$, $10,\text{g}$, and $15,\text{g}$ of salt in $100,\text{mL}$ water.
Find the independent variable: you test $5,\text{g}$, $10,\text{g}$, and $15,\text{g}$ of salt in $100,\text{mL}$ water.
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Mass of salt added. You're changing the amount to test its effect.
Mass of salt added. You're changing the amount to test its effect.
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Identify the control group in this test: add sugar to cold water vs hot water to compare dissolving.
Identify the control group in this test: add sugar to cold water vs hot water to compare dissolving.
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Cold water (baseline condition). Control groups show results without the tested change.
Cold water (baseline condition). Control groups show results without the tested change.
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Which safety step is most important before mixing unknown liquids in class?
Which safety step is most important before mixing unknown liquids in class?
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Wear goggles and follow teacher instructions. Safety equipment and supervision prevent accidents.
Wear goggles and follow teacher instructions. Safety equipment and supervision prevent accidents.
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Which observation best shows that a solid has dissolved in water?
Which observation best shows that a solid has dissolved in water?
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The mixture looks uniform with no visible particles. Complete dissolving creates a clear, transparent solution.
The mixture looks uniform with no visible particles. Complete dissolving creates a clear, transparent solution.
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What is a solvent in a solution made by mixing substances?
What is a solvent in a solution made by mixing substances?
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The substance that does the dissolving. Usually the liquid, like water dissolving salt.
The substance that does the dissolving. Usually the liquid, like water dissolving salt.
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What is a solute in a solution made by mixing substances?
What is a solute in a solution made by mixing substances?
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The substance that dissolves. Like salt or sugar that disappears into water.
The substance that dissolves. Like salt or sugar that disappears into water.
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What is the best unit choice for mass in a classroom mixing investigation?
What is the best unit choice for mass in a classroom mixing investigation?
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Grams (g). Standard metric unit for small masses.
Grams (g). Standard metric unit for small masses.
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What is the best unit choice for liquid volume in a classroom mixing investigation?
What is the best unit choice for liquid volume in a classroom mixing investigation?
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Milliliters (mL). Standard metric unit for small liquid volumes.
Milliliters (mL). Standard metric unit for small liquid volumes.
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Identify the correct tool to measure mass of a substance before mixing.
Identify the correct tool to measure mass of a substance before mixing.
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Balance (scale). It precisely measures weight in grams or other units.
Balance (scale). It precisely measures weight in grams or other units.
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Identify the correct tool to measure liquid volume accurately in a mixing test.
Identify the correct tool to measure liquid volume accurately in a mixing test.
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Graduated cylinder. It has precise volume markings for accurate measurement.
Graduated cylinder. It has precise volume markings for accurate measurement.
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