Physical and chemical changes I
What is a physical change?
A change in matter that doesn't alter the chemical identity.
Are chemical reactions chemical changes?
Yes
What is a chemical reaction?
An interaction between two or more substances that results in different products.
What is the "Mol"?
A unit used to measure quantity of a substance.
Where can you find the molar mass in the periodict table?
Has the same numeric value as the atomic weight.
An ice cube melts, what kind of change is it?
Physical
What is chemical change?
It's a transformation of matter that results in the change of its chemical identity.
What are the names of the substances that participate in a chemical reactions?
Reactives and Products
What is the unit of molar mass?
g/mol
Why is the mol neccesary?
To measure chemical reactions at macro level.
Name the 4 aggregation states of matter.
A piece of wood is cut at half, what kind of change is it?
Physical
It's a reaction in which two or more substances combine to form a new substance.
Synthesis
What is the molar mass of Gold (Au)?
196.967 g/mol
What is the molar mass of Carbon Monoxide (CO)?
28 g/mol
A metal oxydizes, what kind of change is it?
Chemical
A piece of wood burns, what kind of change is it?
Chemical
It's a reaction in which a susbtance separates and form new substances.
Decomposition.
What is the molar mass of Water (H2O)
18 g/mol
Because the molecules and atoms have different masses.
Name one physical change and one chemical change that happens everyday in the human body.
Change in temperature and digestion.
Sweating and respiration
You're in a "carnita asada", name one physical change and chemical change that you can observe.
Water boiling and meat cooking.
Grill's temperature and coal burning.
Are the two types of substitution reactions that exists.
Simple and Double
How many molecules/atoms are in a mol?
6.02 x 10^23
What is the molar mass of Sulfuric Acid (H2SO4)?
98 g/mol