All flashcards
Flashcard 1: Which tool should you use to measure and record the temperature change during mixing?
Answer: Thermometer. Measures temperature precisely to detect heat changes in reactions.
Flashcard 2: What is the term for the liquid that dissolves the solute in a solution?
Answer: Solvent. The dissolving medium, usually present in larger amounts.
Flashcard 3: What is the best term for a mixture with visible different parts after mixing?
Answer: Heterogeneous mixture. Different components remain distinct and can be seen separately.
Flashcard 4: Which observation best shows that a substance has dissolved: clear liquid or visible particles?
Answer: Clear liquid. Dissolved particles are too small to see.
Flashcard 5: What is the term for a mixture that looks uniform throughout, even if it is not a pure substance?
Answer: Homogeneous mixture. All parts look the same, like saltwater or air.
Flashcard 6: What tool is most appropriate to measure and record the temperature change during mixing?
Answer: Thermometer. Measures heat changes during mixing reactions.
Flashcard 7: What is the term for a mixture in which one substance dissolves evenly in another?
Answer: Solution. Particles are evenly distributed and cannot be seen.
Flashcard 8: What is the name of the substance that gets dissolved when a solution forms?
Answer: Solute. The smaller amount that dissolves into the larger amount.
Flashcard 9: What is the term for a solid that forms and settles out of a liquid during a reaction?
Answer: Precipitate. Forms when dissolved substances react and become insoluble.
Flashcard 10: What is the term for a mixture that can be separated by filtering or settling?
Answer: Suspension. Particles settle out because they don't dissolve.
Flashcard 11: What is the term for a mixture with visible, different parts that are not evenly mixed?
Answer: Heterogeneous mixture. Components remain separate and can be distinguished.
Flashcard 12: What tool is most appropriate to measure and record the volume of a liquid before and after mixing?
Answer: Graduated cylinder. Has marked lines to measure liquid amounts precisely.
Flashcard 13: What is the name of the substance that does the dissolving in a solution?
Answer: Solvent. Usually the liquid that dissolves other substances.
Flashcard 14: Which observation is the best evidence that a new solid formed during mixing?
Answer: A precipitate appears. Solids forming from liquids show chemical change.
Flashcard 15: Which change is evidence of a chemical reaction when substances are mixed: new gas bubbles or melting ice?
Answer: New gas bubbles. Gas formation indicates new substances are created.
Flashcard 16: Which observation should be recorded first in a mixing investigation: initial properties or final properties?
Answer: Initial properties. Need starting conditions to compare with changes.
Flashcard 17: What is the best way to record mixing results so another student can repeat the test?
Answer: Write labeled steps and measurements. Clear procedures allow others to replicate experiments.
Flashcard 18: Which change is mainly physical, not chemical: sugar dissolving in water or rust forming on iron?
Answer: Sugar dissolving in water. Sugar molecules spread between water molecules unchanged.
Flashcard 19: Which separation method best recovers dissolved salt from saltwater: filtration or evaporation?
Answer: Evaporation. Water evaporates, leaving dissolved solids behind.
Flashcard 20: Which separation method best removes undissolved solid from water: filtration or evaporation?
Answer: Filtration. Filter paper traps solids while liquid passes through.
Flashcard 21: What tool is most appropriate to measure and record mass of substances before and after mixing?
Answer: Balance (scale). Measures weight to track if mass is conserved.
Flashcard 22: Identify the correct conclusion: After mixing two clear liquids, a solid forms. Physical or chemical change?
Answer: Chemical change. Precipitate formation shows new substances were created.
Flashcard 23: Which data table heading best fits recording changes during mixing: “Opinion” or “Observations (time, color, temp)”?
Answer: Observations (time, color, temp). Scientific data requires measurable, factual information.
Flashcard 24: What is the term for a substance that dissolves in a liquid when a solution forms?
Answer: Solute. The substance being dissolved, usually present in smaller amounts.
Flashcard 25: What is the best term for a mixture that looks the same throughout after mixing?
Answer: Homogeneous mixture (solution). All parts have the same composition and properties throughout.
Flashcard 26: What is the name for a solid that forms when two liquids are mixed and react?
Answer: Precipitate. Forms when dissolved substances react to create an insoluble product.
Flashcard 27: Which observation best shows a chemical change: a solid forms, evaporating, or mixing colors of paint?
Answer: A solid forms (precipitate). Precipitates form when new insoluble substances are created.
Flashcard 28: Which observation best shows a chemical change: heat produced, cutting, or stretching?
Answer: Heat produced (temperature change). Chemical reactions often release or absorb energy as heat.
Flashcard 29: Which observation best shows a chemical change: gas bubbles, dissolving, or freezing?
Answer: Gas bubbles. Gas formation indicates new substances are being produced.
Flashcard 30: What is the term for a change where no new substance forms when substances are mixed?
Answer: Physical change. The substances keep their original properties and can be separated.