Question

Take boiling hot water in a pan and dip 10 objects of different material in it such that

HALF of the objects are outside water level . Touch them and write your

observation write the activity also . Objects

Which are hot to touch are conductors and which are cold are non conductors.

Separate the objects as conductors and non conductors.​

Answer 1

Explanation:

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Lesson 2.1

Heat, Temperature, and Conduction

Key Concepts

Adding energy (heating) atoms and molecules increases their motion, resulting in an increase in temperature.

Removing energy (cooling) atoms and molecules decreases their motion, resulting in a decrease in temperature.

Energy can be added or removed from a substance through a process called conduction.

In conduction, faster-moving molecules contact slower-moving molecules and transfer energy to them.

During conduction the slower-moving molecules speed up and the faster-moving molecules slow down.

Temperature is a measure of the average kinetic energy of the atoms or molecules of a substance.

Heat is the transfer of energy from a substance at a higher temperature to a substance at a lower temperature.

Some materials are better conductors of heat than others.

Summary

Students will do an activity in which heat is transferred from hot water to metal washers and then from hot metal washers to water. Students will view a molecular animation to better understand the process of conduction at the molecular level. Students will also draw their own model of the process of conduction.

Objective

Students will be able to describe and draw a model, on the molecular level, showing how energy is transferred from one substance to another through conduction.

Evaluation

Download the student activity sheet, and distribute one per student when specified in the activity. The activity sheet will serve as the “Evaluate” component of each 5-E lesson plan.

Safety

Make sure you and your students wear properly fitting goggles.

Materials for Each Group

2 sets of large metal washers on a string

Styrofoam cup filled with hot water

Room-temperature water

2 thermometers

Graduated cylinder or beaker

Materials for the Teacher

1 Styrofoam cup

Thermometer

Hot plate or coffee maker

Large beaker or coffee pot

Note: Energy can also be transferred through radiation and convection, but this chapter only deals with heat transfer through conduction.