2.2. Thermal properties and temperature
A subsection of Physics, 5054, through 2. Thermal physics
Listing 10 of 295 questions
A beaker contains 60 g of a hot substance, initially in the liquid state. shows how the temperature of the substance changes with time t as it cools in a laboratory. t / s temperature °C A B Use to determine the melting point of the substance. The specific heat capacity of the liquid is 1.7 J / (g °C). Calculate the loss of thermal energy from the liquid between t = 0 and t = 20 s. loss of thermal energy = Between points A and B on , the temperature is constant as the substance changes from liquid to solid. Explain why the temperature stays constant, even though thermal energy is lost by the substance. Describe the change in the arrangement of the molecules as the substance changes from a liquid to a solid.
5054_s12_qp_22
THEORY
2012
Paper 2, Variant 2
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Most substances expand when they are heated. State one example where expansion is useful. State one example where expansion causes a problem. Explain, using ideas about molecules, why solids expand when heated. When equal volumes are heated through the same temperature rise, the expansions of solids, liquids and gases are different. Complete each of the two sentences using one of these expressions: much larger slightly larger much smaller slightly smaller 1. The expansion of a solid is than the expansion of a liquid. 2. The expansion of a gas is than the expansion of a liquid.
5054_s14_qp_22
THEORY
2014
Paper 2, Variant 2
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Questions Discovered
295