CHEM: What is a compound?
4
total number of atoms of H after the reaction
4
total number of atoms of H before the reaction
Definition of a compound
A substance made up of atoms from two or more elements that are chemically bonded together
Why are some molecules not compounds?
Because some substances only have 1 element. Like the Oxygen in the air.
Of the following item, which is a compound? CO He Si Fe
CO is a compound
2
How many atoms of oxygen are in the reactants
2 molecules
How many molecule of hydrogen gas are there in this equation?
2
How many molecules of oxygen are in the reactants
What are the reactants
Hydrogen and Oxygen are ____ ?
Examine the diagram of a water molecule. What do the red circles represent? Why?
Hydrogen atoms, because there are two of them in each molecule of water
Are the chemical properties of the compund similar to the elements that made the compound
NO, the properties of the compound are different than the properties of the elements forming them
The symbol for water is H20. Is water listed in the periodic table? Why?
No. Water is composed of 2 elements. Its a compound. The periodic table does not list compounds.
We know from the diagram that Nitrogren will for chemical bonds with the hydrogen atoms to form amonia. Nitrogen is in the same column if the periodic table as Phosphorus (P). What can we predict about phosphorus
Since N and P are in the same column, they would have similar chemical properties, and would be probably combine with 3 Hydrogen atoms.
Definition of molecule
The Smallest unit of a compound.
The Symbol of for ammonia is NH3. What doe the white circles represent in the diagram, How do you know?
The white circles are the Hydrogen molecules because there are three of them
Product
Water is the ___ ?