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9. (a) Describe, in terms of particles, two differences between a solid and a liquid of the same substance - Edexcel - GCSE Physics - Question 9 - 2021 - Paper 1
Question 9
9. (a) Describe, in terms of particles, two differences between a solid and a liquid of the same substance. 1. 2. (b) Figure 20 shows the dimensions of a solid bl... show full transcript
Worked Solution & Example Answer:9. (a) Describe, in terms of particles, two differences between a solid and a liquid of the same substance - Edexcel - GCSE Physics - Question 9 - 2021 - Paper 1
Step 1
Describe, in terms of particles, two differences between a solid and a liquid of the same substance.
Answer
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In a solid, the particles are closely packed together, while in a liquid, the particles are more spaced apart allowing them to move freely.
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Particles in a solid vibrate in fixed positions, whereas in a liquid, they can move around each other more easily.
Step 2
Calculate the mass of the concrete block.
Answer
To calculate the mass of the concrete block, we first need to determine its volume.
Volume (V) of the block can be calculated as follows:
Using the mass equation:
ho imes V $$ Substituting the values: $$ m = 2100 ext{ kg/m}^3 imes 0.3 ext{ m}^3 = 630 ext{ kg} $$Step 3
Step 4
Plan how the student could confirm the teacher’s statements, by determining the density of each of the strips as accurately as possible.
Answer
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The student should measure the length and width of both metal strips with the ruler to calculate their volume. For instance, if the strips have a uniform width and can be measured in a rectangular shape, the volume can be obtained using length times width times height.
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Next, the student should weigh the strips using a balance to find their mass.
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Finally, the density of each strip can be calculated using the formula:
ext{density} = rac{ ext{mass}}{ ext{volume}}
This will help the student verify whether the density matches the expected values of aluminium and stainless steel.