Jeffrey's Smore Project
Physical and Chemical Property
Conservation of Mass
Elements & Compounds
- When element properties form a compound it forms a completely new substance. The properties of a compound are the same as the elements that form it. If the properties of the compound separate back to the element, the substance goes back to the original state.
- Compounds can be separated by a chemical reaction. Elements can be separated by physical methods such as heat energy.
- Similarities of elements and compounds: they are both made of atoms, they both have a chemical change, they both can/can't be broken down
- Differences of elements and compounds: An element is made up of only one type of matter, divisible to a single atom with a unique number of protons, neutrons and electrons. A compound is made up of one or more elements.
- A chemical formula or molecular formula is a way of expressing information about the atoms that constitute a particular chemical compound.
The chemical formula identifies each constituent element by its chemical symbol and indicates the number of atoms of each element found in each discrete molecule of that compound. If a molecule contains more than one atom of a particular element, this quantity is indicated using a subscript after the chemical symbol and also can be combined by more chemical elements. For example, methane, a small molecule consisting of one carbon atom and four hydrogen atoms, has the chemical formula CH4. The sugar molecule glucose has six carbon atoms, twelve hydrogen atoms and six oxygen atoms, so its chemical formula is C6H12O6.