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Chemistry Review, part 2
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What does the atomic number represent?
Protons OR electrons
What is the Law of Conservation of Matter?
Matter and mass can not be created or destroyed.
Nonmetal
Does not readily conduct electricity or heat and is usually a gas at room temperature.
Metal
Good conductor of electricity and heat, most are solids at room temperature.
Oxidation
The chemical reaction occurs when a substance reacts with oxygen.
Product
The molecules formed during a chemical reaction. What you get after you add “stuff” together☺
Reactant
The molecules that take part in a chemical reaction. What is added together☺
Chemical Property
A characteristic that describes how the matter will change under certain conditions.
Physical Property
Any characteristic of a substance can be observed without changing the identity of the substance.
What is the Periodic Table?
The chart organizes information of all known elements according to their properties.
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 are precipitates?
A solid that forms from a chemical reaction that takes place in a solution.
Was the acetone and styrofoam a heterogeneous solution or a homogenous solution, why?
Heterogenous- Not evenly mixed, we can also remove the styrofoam.
In this lab you had acetone and Styrofoam mix to form an interesting solution. What is the solute ?
Styrofoam
In this lab you had acetone and Styrofoam mix to form an interesting solution. Identify what the solvent was.
Acetone
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.
What are nucleation sites?
Tiny pits on the mentos that collect CO2.
What is the difference between endothermic and exothermic reactions?
Exothermic- releases energy, feels hot. Endothermic- absorbs energy, feels cold.
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 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.
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


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