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Teaching Guide
Feeling Pressured
Memory Matters
Getting the Minerals Out

Educator Notes

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TO PREPARE SOLUTION
To prepare this dilute hydrochloric acid solution, the teacher or lab technician should add 2 ml of concentrated hydrochloric acid to 1000 ml of distilled water. Weak solutions of HCl are also available from commercial supply houses.

 

SAFETY

Review all safety procedures associated with handling and using potentially dangerous liquids within the classroom. Locate the eyewash and demonstrate its proper use prior to distributing these materials. Make sure that everyone wears safety goggles and an apron to protect against chemical splashes. Identify the location of the safety shower and review its proper use.

ANSWERS
1. Hydrochloric acid and vinegar
2. Calcium and other bone minerals went into solution, leaving behind the spongy, protein tissue
3. They were both acids.
4. Water was used as a control liquid, since it has a neutral pH.

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CURRICULUM LINKS
 Space Science :
 Planets, gravity
 Chemistry:
 Enzymes, reactions, acids and bases
 Biology:

 Bone structure, proteins, minerals

 Physics:
 Pressure, strength of materials
 
NATIONAL SCIENCE STANDARDS

 Science As Inquiry
 5-8:
 
Abilities necessary to do scientific inquiry,
 Understandings about scientific inquiry
 9-12:
 
Abilities necessary to do scientific inquiry,
 Understandings about scientific inquiry
 Earth & Space Science

 5-8:
 Structure of the Earth System
 
Earth's History
 Earth in the Solar System

 9-12:
 Origin and Evolution of the Earth System
 Life Science
 5-8:
 Structure and Function in Living Systems;
 Diversity and Adaptations of Organisms.
 9-12:
 Matter Energy and Organization in Living Systems
 Physical Science
 5-8:
 Motions and Forces
 9-12:
 Structure of Properties in Matter
 Chemical Reactions
 Interactions of Energy and Matter

 

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