OML Search

Chemistry in Everyday Life

Related Topics:
More Science Worksheets
Math Worksheets

A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Chemistry in Everyday Life
Importance of Chemistry in Life, Everyday Uses
Our bodies are made of chemicals. When we eat, breathe, or just sit down, chemical reactions are taking place. In fact all matter is made from some kind of chemicals so chemistry is the study of everything.

Dust Explosion Using Corn Starch
Hand Warmers
There two common types of hand warmers: single-use and reusable. The single-use, disposable version typically releases heat for 1 to 10 hours. Inside the package there is a combination of ingredients (cellulose, iron, water, activated carbon, vermiculite and salt). When these ingredients are mixed together and exposed to air, it begins a chemical reaction called oxidation that releases energy as heat. This heat will last as long as the materials inside continue reacting.

This reusable type heats up when the supersaturated solution within it begins to crystallize. A supersaturated solution is a solution that has been forced to dissolve more solids. This supersaturated solution is very unstable and can crystallize (turn into a solid) very easily. When the flexible metal activator is bent, a few tiny pieces of metal break off. These tiny pieces act as a place for crystals to start growing (often called a nesting site). Once the process of crystallization begins, it won't stop until all of the solution has turned solid. During this process, a large amount of heat is released; up to 50°C for about 30-40 minutes. To reuse the warmer, it just needs to be reheated in boiling water for a few minutes. The sodium acetate re-dissolves and turns back into a gel-like liquid. Iron, Rusting and Prevention

Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

OML Search

We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.

[?] Subscribe To This Site

follow us in feedly
Add to My Yahoo!
Add to My MSN
Subscribe with Bloglines