- Elements are substances that can't be broken down into anything simpler
- All elements are listed on the Periodic Table
- Elements combining=compounds
- Chemical formulas show the elements that make up a compound
- The subscript in a chemical formula tell us how many atoms of each element are in a compound.
1. A chemical formula is a combination of symbols that represents the composition of a compound.
2. The element present and the relative number of atoms
3. Oxidation numbers and the charges on polyatomic ions
1. Cr,O,N,H
2. 8
3. 2
4. If it has the same number of each element it is balanced
5. No, because there isn't the equal amount of elements
1. The equation represents a sentence in the language of chemistry
2. 1) The different types of matter involved in the reaction
2) The states of all the different types of matter (solid, liquid, gas)
3) A reflection of the law of conservation of mass, that is, that the same numbers and types of atoms appear on both sides of the arrow in the equation.
3. The arrow represents an equal sign
4. that the same numbers and types of atoms appear on both sides of the arrow in the equation.