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Visitors mix urea with water in one flask and mix calcium chloride with water in another flask. They observe that the urea flask gets cold and the calcium chloride flask gets hot. Visitors learn that some chemical reactions release energy in the form of heat and others absorb energy, becoming cold. They learn that there are practical uses for these kinds of chemical reactions.
- 30 to 45 minutes
- Under 5 minutes
- $1 - $5 per group of students
- Ages 6 - adult
- Activity, Experiment/Lab Activity
- English
Quick Guide
Materials List (per group of students)
- Two 250-ml Erlenmeyer flasks
- Two 1-tsp (4-ml) measuring spoons (one yellow; one red)
- Two small plastic funnels
- One 25-ml graduated cylinder
- CaCl2 (calcium chloride) pellets (keep 1000 g on hand)
- NH2CONH2 (urea) (keep 1000 g on hand)
- One 250-ml squirt bottle
- Super glue
- Two small jars (about 8-oz size) with lids
- Two large jars (32-oz or larger) with lids
Subjects
-
Engineering and Technology
-
Engineering
- Chemical Engineering
- Technology
-
Engineering
-
Physical Sciences
-
Heat and Thermodynamics
- Heat and Temperature
- Thermodynamics and Entropy
- Energy
-
Chemistry
- Chemical Bonding
- Chemical Reactions
- States of Matter
- Structure and Properties of Matter
-
Heat and Thermodynamics
-
Life Sciences
- Human Body
-
The Nature of Science
- Science and Society
-
The Nature of Technology
-
Technology and Society
- Technology and the Environment
-
Technology and Society
Audience
To use this activity, learners need to:
- see
- read
Learning styles supported:
- Involves hands-on or lab activities
Other
Components that are part of this resource:
This resource is part of:
Access Rights:
- Free access
By:
Rights:
- All rights reserved, Oregon Museum of Science and Industry, 1997
Funding Source:
- National Science Foundation