Matter, Atoms, and Energy

Energy is required for physical, chemical, and nuclear changes to occur. Energy is the ability to do work. Matter is very important too. Matter is anything that takes up space. The basic building block of matter is the atom. There are over 100 different types of atoms or elements. Matter and energy can not be created or destroyed, but it can be transformed. Physical changes can alter the shape, size, texture, density, or mass. Atoms have positive and negative charges that attract to form a bond known as a chemical bond. A chemical bond is created by electromagnetic force. Electromagnetic force attracts electrons to the nucleus of the atom. Molecules also interest me very much. Example of a molecule: o2 represents the molecule of oxygen. A compound is when molecules form from different elements. A mixture is two or more substances mixed together that can be separated. An example of a compound would be: trail mix, because there are several different substances that are mixed together that can be separated. A solution is when two or more substances can be evenly distributed. A chemical change in matter would be when chemical bonds between atoms are either broken or formed. Burning a piece of paper and baking a cake would be an example of a chemical change in matter, because you can not " unburn a piece of paper or rebake a cake." Combustibility means a substance has the ability to burn.