Inquiry, Measurement & Models — Chapter quiz · Science 6: Matter, Energy & Earth Systems, Grade 6

What makes a scientific explanation traceable and testable? Under one defined mass-and-draining method, which equal-sized towel sample retains more water?

Problem 1

Which statement is scientifically accurate for Scientific Inquiry: Questions, Evidence & Explanations?
  1. Every scientific investigation must follow exactly the same steps.
  2. A plausible explanation is automatically a directly observed fact.
  3. observation: A recorded detection or measurement under a stated method.
  4. Every classroom model reproduces reality exactly.
Answer and explanation

observation: A recorded detection or measurement under a stated method.

A recorded detection or measurement under a stated method. The sunny tray lost 4 g more in the hour, but sunlight and surface area both differ. Greater exposed area could also affect evaporation. Use identical trays with equal water amounts and matched timing, varying only the intended exposure. The present evidence describes a difference without isolating its cause.

Problem 2

A photograph shows a wet pavement. Does it establish that rain caused the water?
Answer and explanation

No. It shows water at that moment; washing, irrigation, or another source could be involved. A cause needs additional information.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 3

Which statement is scientifically accurate for Variables, Controls & Repeated Trials?
  1. Every classroom model reproduces reality exactly.
  2. Repeating a confounded test makes its causal claim valid.
  3. A control treatment automatically keeps every other condition equal.
  4. independent variable: The factor deliberately changed for the intended comparison.
Answer and explanation

independent variable: The factor deliberately changed for the intended comparison.

The factor deliberately changed for the intended comparison. Width and length both change. Length can affect bending, so the larger load does not isolate width. Keep length, material, support spacing, and counter placement the same, vary width, and use several fresh strips for each treatment. Compare all recorded loads under the same failure rule.

Problem 4

Three repeated trials all use different counter sizes. Does repetition fix the method?
Answer and explanation

No. Counter count is not comparable when counter mass differs. Use identical counters or measure load mass, then repeat the corrected method.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 5

Which statement is scientifically accurate for Metric Measurement, Units & Uncertainty?
  1. unit: A defined reference used to express a measurement.
  2. A measurement without a unit is fully interpretable.
  3. Writing more digits automatically improves measurement quality.
  4. Every classroom model reproduces reality exactly.
Answer and explanation

unit: A defined reference used to express a measurement.

A defined reference used to express a measurement. The lengths are 6.5 cm and 6.4 cm, or 65 mm and 64 mm. The 1 mm difference is observed reading variation; the values do not establish a length exact to many decimal places. Check alignment and use the ruler’s scale consistently.

Problem 6

A 1.2 kg bag is described as 120 g. Correct the conversion and explain the direction.
Answer and explanation

1.2 kg = 1,200 g. A gram is smaller than a kilogram, so the numerical count grows when the same mass is expressed in grams.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 7

Which statement is scientifically accurate for Tables, Graphs & Patterns in Data?
  1. A missing value is automatically a measured zero.
  2. mean: The sum of comparable values divided by their count.
  3. A graph’s association automatically establishes a cause.
  4. Every classroom model reproduces reality exactly.
Answer and explanation

mean: The sum of comparable values divided by their count.

The sum of comparable values divided by their count. The unwrapped cup decreases by 9 °C and the wrapped cup by 5 °C. The wrapped cup cools less over ten minutes under the stated comparison. This supports slower cooling if volumes, lids, location, and measurement are matched; it does not prove the wrapping prevents all energy transfer.

Problem 8

Two category bars begin at 98 instead of zero and show 100 and 102. What should a reader check?
Answer and explanation

Check the labeled axis and full difference: 2 units. A shortened axis can emphasize that difference, so the graph should make its scale explicit rather than suggest a huge proportional change.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 9

Which statement is scientifically accurate for Models, Systems & Scientific Explanations?
  1. A sealed system cannot exchange energy.
  2. A useful model must reproduce every feature at full size.
  3. model: A representation used to explain or predict selected features and relationships.
  4. Every classroom model reproduces reality exactly.
Answer and explanation

model: A representation used to explain or predict selected features and relationships.

A representation used to explain or predict selected features and relationships. The record is consistent with water remaining inside the sealed system while energy transfers to cooler surroundings. The 10 °C drop is not ten joules; calculating energy would require additional information. Constant measured mass does not mean every particle is motionless or that the container blocks energy.

Problem 10

An Earth–Moon model uses a large nearby ball so phases can be seen. Is its distance necessarily correct?
Answer and explanation

No. Its size and distance may be deliberately exaggerated to show illumination. State whether the model is about viewing geometry or numerical scale before using it.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

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