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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 ... 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, resulting in a fixed shape, whereas in a liquid, the particles are not as tightly packed, allowing them to flow and take the shape of their container.
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The particles in a solid vibrate in fixed positions, while the particles in a liquid move more freely due to greater kinetic energy.
Step 2
Calculate the mass of the concrete block.
Answer
To calculate the mass, we first find the volume of the block:
- Volume,
Using the dimensions from Figure 20:
- Length = 1.5 m
- Width = 1.0 m
- Height = 0.20 m
Thus,
Now, using the density formula:
ho imes V = 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
The student should first measure the length and width of each metal strip using the ruler. They should then measure the mass of each strip using a balance scale.
With the mass obtained, the student can calculate the volume using the formula:
Finally, the density can be calculated using the formula: ext{Density} = rac{ ext{mass}}{ ext{volume}}
By comparing the calculated densities to the known densities, the student can confirm the material of each strip.