Physical Properties & Physical Changes — Practice · Grade 6 Science

Chapter: Matter, Mixtures & Water Properties

What this practice covers

By the end of Physical Properties & Physical Changes you should be able to:

8 questions, written answer and multiple choice, each with a worked explanation.

Vocabulary used: physical property, density, evidence, system boundary, uncertainty.

Problem 1

Why is transparency insufficient for identification?
Answer and explanation

Different substances can share that appearance. Additional appropriate measurements and known source information are needed.

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

Problem 2

Does irreversibility alone prove chemical change?
Answer and explanation

No. A physical change can be difficult to undo; evidence about substance identity is more relevant.

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

Problem 3

What is the larger piece’s density if it is 60 g and 20 cm³?
Answer and explanation

60 ÷ 20 = 3 g/cm³; size changed but the ratio stayed the same.

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

Problem 4

How can a second property strengthen identification?
Answer and explanation

It distinguishes possibilities that the first property cannot separate; the conclusion should still match the available evidence.

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

Problem 5

Develop a complete response: Calculate density and explain why the shape change is physical under the stated model. Include relevant evidence and one method or model limit.
Answer and explanation

48 ÷ 24 = 2 g/cm³. Reshaping changes outline while the modeled material and measured mass/volume remain. It is described as physical because no new substance is formed in this model, not simply because the shape might be restored.

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

Problem 6

Apply the unit independently: A material is blue and heavy. Can those words uniquely identify it? Give a reason and a relevant qualification.
Answer and explanation

No. Blue depends on the observation conditions, and heavy depends on sample size and comparison. Measured properties and additional evidence are needed.

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 correctly uses physical property in Physical Properties & Physical Changes?
  1. The largest sample must have the greatest density.
  2. Every change that is hard to reverse must be chemical.
  3. physical property: A characteristic measured or observed without changing chemical identity.
  4. One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation

physical property: A characteristic measured or observed without changing chemical identity.

A characteristic measured or observed without changing chemical identity. 48 ÷ 24 = 2 g/cm³. Reshaping changes outline while the modeled material and measured mass/volume remain. It is described as physical because no new substance is formed in this model, not simply because the shape might be restored.

Problem 8

Which statement correctly uses density in Physical Properties & Physical Changes?
  1. One illustrative result establishes every real condition and needs no further evidence.
  2. Every change that is hard to reverse must be chemical.
  3. The largest sample must have the greatest density.
  4. density: Mass per unit volume under stated conditions.
Answer and explanation

density: Mass per unit volume under stated conditions.

Mass per unit volume under stated conditions. 48 ÷ 24 = 2 g/cm³. Reshaping changes outline while the modeled material and measured mass/volume remain. It is described as physical because no new substance is formed in this model, not simply because the shape might be restored.

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