Temperature and Density Lesson 5 Temperature and Density

Lesson 5 – Temperature & Density You will observe the effect of heat on a bimetal strip. You will investigate how temperature affects the volume of matter by using a glass tube in a rubber stopper placed in a test tube filled with water. 2

Lesson 5 – COS 1.0 1.1 1.2 1.3 1.4 1.5 7.0 3

Objectives Use a thermometer and discuss the purpose of its different parts. Build a working thermometer and use it to measure temperature. Discuss how your thermometer works and relate this to changes in the volume and density of matter.

Lesson 5 – (1-2) Vocabulary heat - a form of energy that can move from a hot place to a cooler place; the transfer of energy from one body to another. temperature - a measure of the kinetic energy of the particles that make up matter; the measurement of how hot something is. Celsius - a temperature scale with the melting point of ice at 0 degrees and the boiling point of water at 100 degrees. 5

Lesson 5 – (2-2) Vocabulary Fahrenheit - a temperature scale with the melting point of ice at 32 degrees and the boiling point of water at 212 degrees. Kelvin - a temperature scale with the lowest possible temperature at the zero point, which is called absolute zero; ice melts at 273 K. Expansion: The increase in the volume of matter that occurs when matter is heated. Contraction: The decrease in the volume of matter that occurs when matter is cooled. 6

Lesson 5 – Question What is the relationship between temperature, heat, and density? 7

Lesson 5 If….. then ….. because ….. Hypothesis 8

SAFETY Do not shake the thermometers. Unlike medical thermometers, the lab. thermometers do not require “shaking down” and shaking increases the chances of breakage. Always place the thermometers in a safe spot—do not let them roll off the table. Handle the thermometers gently.

Lesson 5 - Procedure 1. Gather materials. Put the glass tubing in a rubber stopper. Place the rubber stopper in a test tube. Place the test tube assembly in a hot pot. Record observations. Place test tube assembly in cold water. Observe a thermometer – how does it work? 10

Lesson 5 Results 11

Lesson 5 - Conclusion Heat is a form of energy that can move from a hot place to a cooler place (measured in joules). Temperature is a measure of kinetic energy of particles of matter (measured by a thermometer in degrees Celsius). Density changes with temperature: As temperature increases, density will decrease and volume will increase (mass stays the same). expansion As temperature decreases, density will increase and volume will decrease (mass stays the same). contraction Gas or liquid-filled thermometers work as the result of expansion or contraction…………. 12