What is a period?
Rows on the periodic table, they are read left to right. The period will show you how many shells each row of elements have. Ex. Period 2 has 2 shells, Period
What is a group?
These are called families too. This is the column. This will explain how many valence electrons there are, example group 1 has 1 valence electron.
List five clues that indicate that there was a chemical reaction.
1) Change in color 2) Release of energy 3) Formation of a gas 4) Precipitate 5) Odor
What is the difference between endothermic and exothermic reactions?
Exothermic- releases energy, feels hot. Endothermic- absorbs energy, feels cold.
What are nucleation sites?
Tiny pits on the mentos that collect CO2.
Do you think this was a chemical reaction or a physical reaction? WHY?
PHYSICAL. No “new” molecules were created. The CO2 was already in the bottle, the mentos collected and released the CO2.
In this lab you had acetone and Styrofoam mix to form an interesting solution. Identify what the solvent was.
Acetone
In this lab you had acetone and Styrofoam mix to form an interesting solution. What is the solute ?
Styrofoam
Was the acetone and styrofoam a heterogeneous solution or a homogenous solution, why?
Heterogenous- Not evenly mixed, we can also remove the styrofoam.
What are precipitates?
A solid that forms from a chemical reaction that takes place in a solution.
What is a Chemical Formula?
Chemical symbols and subscripts to identify the number of atoms of each element in a molecule of a compound. (Ex: H2O – 2 H atoms plus 1 O = 3 atoms
What is the Periodic Table?
The chart organizes information of all known elements according to their properties.
Physical Property
Any characteristic of a substance can be observed without changing the identity of the substance.
Chemical Property
A characteristic that describes how the matter will change under certain conditions.
Reactant
The molecules that take part in a chemical reaction. What is added together☺
Product
The molecules formed during a chemical reaction. What you get after you add “stuff” together☺
