Question

vity c (continued from previous page) analyze: heat will travel quickly through a conductor, but more slowly through an insulator. a good conductor will heat up quickly and cool down quickly. the best insulators take longer to warm up but then stay warm for a longer period of time. a. which material is the best conductor? ________ b. which material is the best insulator? ________ c. if the bag was made from a metal (like sturdy aluminum foil), do you think it would lose its heat faster or slower than the plastic bags? explain your reasoning. experiment: to construct a cold pack, choose the powder from activity b that produced the greatest temperature decrease. just like with the hot pack, use the same amounts of water and powder in each pack. test each of the five types of materials. record data below: type of material ldpe hdpe latex mylar neoprene minimum temp. (°c)

Explanation:

Step1: Recall heat - conduction properties

Metals are generally good conductors. Among common metals, silver has one of the highest thermal conductivities. But in a more practical and common - sense context for this question, metals like copper and aluminum are well - known good conductors.

Step2: Recall heat - insulation properties

Materials like wool, styrofoam, and fiberglass are good insulators. In the context of common household or laboratory materials, styrofoam is a well - known insulator.

Step3: Analyze heat loss of metal vs plastic

Metals are good conductors. Since aluminum is a metal and plastic is an insulator, a metal bag (aluminum foil) will lose heat faster because it allows heat to transfer more quickly.

Answer:

A. Copper (or other common good - conducting metals like aluminum)
B. Styrofoam
C. It would lose its heat faster. Reason: Metals are good conductors of heat and allow heat to transfer more quickly than plastic (an insulator).