A student measures the density of glass. The student has - a bag of marbles, all made from the same type of glass - a weighing balance - a plastic measuring cylinder containing water Describe how the student could find, as accurately as possible, the density of the glass used for the marbles. (4) A beaker contains 0.25 kg of water at room temperature. The beaker of water is heated until the water reaches boiling point (100°C). The specific heat capacity of water is 4200/kg°C. The total amount of thermal energy supplied to the water is 84,000 J. (i) Calculate the temperature of the water before it was heated. Use an equation selected from the list of equations at the end of this paper. (3) temperature before heating = __________ °C

GCSE Edexcel Physics Combined Science Density ρ: A student measures the density o

A student measures the density of glass - Edexcel - GCSE Physics Combined Science - Question 4 - 2019 - Paper 1

Question 4

A student measures the density of glass. The student has - a bag of marbles, all made from the same type of glass - a weighing balance - a plastic measuring cylinde... show full transcript

Worked Solution & Example Answer:A student measures the density of glass - Edexcel - GCSE Physics Combined Science - Question 4 - 2019 - Paper 1

Step 1

Describe how the student could find, as accurately as possible, the density of the glass used for the marbles.

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Answer

Find the Mass of the Marbles:
- Use the weighing balance to measure the mass of the bag of marbles.
Measure the Volume of Water Displaced:
- Fill the measuring cylinder with a known volume of water and record this level.
- Carefully add the marbles into the cylinder, ensuring they are fully submerged.
- Measure the new water level and calculate the change in level to find the volume of water displaced by the marbles.
Calculate the Volume Displaced:
- The volume of the displaced water equals the volume of the marbles.
Calculate the Density:
- Use the formula for density: $\text{Density} = \frac{\text{Mass}}{\text{Volume}}$
- Substitute the mass of the marbles and the volume of water displaced into this equation.
- Optionally, use several marbles to improve measurement accuracy and take an average for the density calculation.

Step 2

(i) Calculate the temperature of the water before it was heated.

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Answer

Identify the Given Values:
- Mass (m) = 0.25 kg
- Specific heat capacity (c) = 4200 J/kg°C
- Thermal energy supplied (Q) = 84,000 J
Use the Heat Energy Formula:
- The formula is: $Q = m \times c \times \Delta \theta$ where (\Delta \theta) is the change in temperature.
Substitute the Values:
- Substitute into the formula: $84,000 = 0.25 \times 4200 \times \Delta \theta$
Rearrange to Find (\Delta \theta$$:
- Rearranging gives: $\Delta \theta = \frac{84,000}{0.25 \times 4200}$
- Calculate (\Delta \theta = 80°C$$.
Determine the Initial Temperature:
- Since the boiling point is 100°C, the temperature before heating is: $\text{Temperature before heating} = 100°C - 80°C = 20°C$ .

A student measures the density of glass - Edexcel - GCSE Physics Combined Science - Question 4 - 2019 - Paper 1

Worked Solution & Example Answer:A student measures the density of glass - Edexcel - GCSE Physics Combined Science - Question 4 - 2019 - Paper 1

Describe how the student could find, as accurately as possible, the density of the glass used for the marbles.

(i) Calculate the temperature of the water before it was heated.

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