Term | Definition |
Atom | The smallest piece of matter that has the properties of an element . |
Molecule | The particle of a substance that is made from a combination of two or more atoms of different elements bonded together. |
Proton | In an atom, the particle that has mass and carries a positive charge. |
Neutron | The particle of an atom that has mass and no electrical charge. |
Electron | The part of the atom that carries little mass and has a negative electrical charge |
Element | A substance that is made up entirely of only one type of atom |
Chemical Change | When a substance undergoes a molecular change that cannot be reversed, like spoiled milk. |
Physical Change | When a substance undergoes a change in form, but the substance itself remains unchanged. |
Endothermic reaction | When molecules interact to form new molecules, and in the process, energy is absorbed from the environment. |
Chemical reaction | The process of rearranging atoms of original molecules into new substances with different properties |
Exothermic reaction | When substances interact in a chemical reaction and energy is released in the process. |
Mass | The amount of matter that makes up a substance, measured in grams. |
Matter | Anything that takes up space and has mass. |
Reactants | Atoms or molecules of substances that interact to cause a chemical reaction. |
Products | New, different molecules that are formed when different molecules interact. |
Phases of matter | When substances can exist in different forms, like ice, water and water vapor, these forms are known as: |
Property | Any observable or measurable characteristic of a substance. |
Material | Any substance that has been designed to be used for certain application, whether natural or made by man. |
Science | All knowledge that has been obtained by conducting experiments. |
Nucleus | In an atom, where protons and neutrons are located. |