Lead Iodide experiment

A solutions of lead (II) nitrate is dropped into a solution of potassium iodide, forming a brilliant yellow lead iodide precipitate.

Physical or Chemical Changes

Physical & chemical changes from butch2bn

Chemical Reaction Quiz

2. Marco 

The student is able to distinguish between physical change and chemical reaction           1.Marco tears a piece of notebook paper into smaller pieces, tearing paper into pieces  pieces is an example of what kind of change?              2. Which process is an example of a physical change?           A. burning B. rusting .  C.flattening 3. Chemical changes result in new substances, but physical changes do not. Which process is an example of a chemical change? A. baking a cake B. chopping a tree  C. heating a cup of tea 4. Which observation is a sign of a chemical change? A. A rotting potato gives off a bad smell. B. A melting block of ice leaves a large puddle. C. A cloud changes shape when blown by wind. D. A plaster statue breaks when it falls onto the floor.                      5. There are several differences between chemical and physical changes. Which process is an example of a chemical change? A. steam rising from a boiling pot of soup B. a metal railing rusting in damp weather C. alcohol evaporating from a cotton swab D. a piece of wood shrinking as it dries out

Physical and Chemical Changes

How to clean fossils with vinegar

Curiosity

Cells contain molecules that are made up of even smaller components called atoms.

http://www.dummies.com/education/science/building-the-body-from-atoms-to-organs/

What are atoms?

What are atoms?

Atoms are the basic building blocks of matter that make up everyday objects. A desk, the air, even you are made up of atoms!

Atoms are the basic units of matter and the defining structure of elements. The term "atom" comes from the Greek word for indivisible, because it was once thought that atoms were the smallest things in the universe and could not be divided. We now know that atoms are made up of three particles: protons, neutrons and electrons — which are composed of even smaller particles such as quarks.

https://education.jlab.org/atomtour/
https://www.livescience.com/37206-atom-definition.html