a) Solid, liquid and gas are states of matter - Edexcel - GCSE Physics Combined Science - Question 4 - 2019 - Paper 1
Question 4
a) Solid, liquid and gas are states of matter.
Which process describes the change from a solid to a liquid?
b) A student determines the density of a liquid.
The stu... show full transcript
Worked Solution & Example Answer:a) Solid, liquid and gas are states of matter - Edexcel - GCSE Physics Combined Science - Question 4 - 2019 - Paper 1
Step 1
mass of liquid added = __________ g
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Answer
To calculate the mass of liquid added, subtract the mass of the empty measuring cylinder (201 g) from the mass after the liquid is added (230 g).
extMassofliquidadded=230extg−201extg=29extg
Step 2
volume of liquid added = __________ cm³
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Answer
Since the density of the liquid is typically defined as mass/volume, and we have calculated the mass, we can ascertain that the volume added will also be equal to the mass added because the densities are equivalent in this context. Thus:
extVolumeofliquidadded=29extcm3
Step 3
Which equation should the student use to calculate the density of the liquid?
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Answer
To calculate the density of the liquid, the student should use option D:
ext{Density} = rac{ ext{mass}}{ ext{volume}}
Step 4
State two improvements the student could make to this investigation.
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Answer
Use a balance that reads to one or more decimal places for more accurate mass measurements.
Measure the liquid at eye level to avoid parallax error when reading the measuring cylinder.
Step 5
energy needed = __________ J
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Answer
To calculate the energy needed, we use the formula:
ΔQ=m×c×Δθ
Substituting the values:
m = 1.5 kg
c = 4200 J/kg °C
Δθ = 50 °C
We get:
ΔQ=1.5imes4200imes50=315000extJ
Step 6
time to bring the water to boiling point is __________ s
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