Proton, Neutrons, Electrons Flashcards
Electrons that are on the outermost energy level of an atom and are involved in bonding are ___
Valence electrons
Which subatomic particle has a + charge?
Proton
Which has the same # of valence electrons?
a) periods
b) groups
Groups
Where are metals located on the periodic table?
Left side of zig zag
Are most metals liquid or solid at room temp?
Solid
Where are the most reactive metals found?
Alkali metals
What are the 2 most common alkaline earth metals?
Magnesium and calcium
Where are non metals?
Right of zig zag
At room temp, more than half of the non metals are __
Gases
Fluorine, chlorine, and bromine are part of the __ family
Halogen
A chemical reaction that absorbs energy from it’s surrounding are ___ reactions
Endothermic
What force holds atoms together?
Chemical bonds
What happened when bonds break and new bonds are created?
Chemical reactions
Any solid that forms and separates from a liquid mixture is a ____
Precipitate
What is the only sure evidence that a chemical reaction has occured?
The composition of the matter changes
A chemical equation expressed using letters and number is called a ___
Chemical equation
Substance that undergoes change is a ___
Reactant
Law of conservation of mass states:
Matter is neither created not destroyed
2 or more substances react to form a single substance is a ___ reaction
Synthesis
An ____ energy starts the reaction
Activation
A ___ slows down the reactions
Inhibitor
Substance reacts rapidly w/ oxygen, often producing heat and light
Combustion
A large amount of a solute in a solvent
Ex: the tea you get tastes weak
Dilute
1 that contains as much solute as the solvent can hold at a given temp.
Saturated solution
What happens to the freezing point of a solution when a solute is added?
Freezing point is lowered
Properties of bases?
- bitter taste
- slippery feel
- litmus blue paper
Acids form what time of ions?
H+ and chloride
pH scale measures?
Concentration of hydrogen ions in a solution
Is a solution has a pH of 9, it is a ___
Base
Reaction between an acid and a base is a ___
Neutralization
What are the products of neutralization?
They are made of sodium, chloride ions, and water
