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When water boils and turns into steam, there are changes in the arrangement of particles and the density - Edexcel - GCSE Physics - Question 9 - 2022 - Paper 1
Question 9
When water boils and turns into steam, there are changes in the arrangement of particles and the density. Which of these shows the changes? A B C D Figure 21 sho... show full transcript
Worked Solution & Example Answer:When water boils and turns into steam, there are changes in the arrangement of particles and the density - Edexcel - GCSE Physics - Question 9 - 2022 - Paper 1
Step 1
Step 2
Calculate the mass of the lump of iron.
Answer
To find the mass of the lump of iron, we use the formula for density:
ext{density} = rac{ ext{mass}}{ ext{volume}}Given:
- Volume displaced by the lump of iron is calculated as:
Now, substituting the values into the formula:
7.9 g/cm³ = rac{ ext{mass}}{40 cm³}Rearranging gives us:
Hence, the mass of the lump of iron is: 320 g (to 2 significant figures).
Step 3
Explain why the method used in part (b) cannot be used to determine the mass of the piece of wood.
Answer
The method used in part (b) involves measuring the water displaced by the lump of iron, which works because the iron is denser than water and sinks. However, wood has a lower density than water, meaning it would float and displace less water than its volume, leading to an incorrect measurement. Thus, the mass of the piece of wood cannot be accurately determined using this method.
Step 4
Describe the method the student should use to determine the specific heat capacity of water.
Answer
To determine the specific heat capacity of water, the student can follow these steps:
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Equipment Needed: Use a low voltage heater, a thermometer, a beaker filled with a specified amount of water, and a measuring device for recording temperature changes.
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Setup: Place the beaker on a heat-resistant surface and insert the thermometer to monitor temperature changes.
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Procedure:
- Measure the initial temperature of the water.
- Begin heating the water with the low voltage heater while continuously stirring to ensure even heat distribution.
- Record the temperature at regular intervals until a significant rise is noted.
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Calculations: Use the formula for specific heat capacity:
s = rac{Q}{m imes riangle T}
Where: - $Q$ is the heat added (in joules), - $m$ is the mass of the water (in grams), - $ riangle T$ is the change in temperature (in degrees Celsius). 5. **Repeat:** Repeat the experiment a few times to ensure accurate results. A diagram can help demonstrate the setup, showing equipment and water levels.