Vocab
This is what holds atoms together after their electrons are rearranged
Chemical Bond
This state of matter has a definitive volume but no actual shape
Liquid
These electrons have the highest energy of an atom and allow an atom to chemically bond.
Valence Electrons
When you crumple up a piece of paper a ______ change has occurred
This is what we breathe everyday and is a non-metal
Oxygen
This tells the ratio of elements in a compound. It is also the little letter written next to a compound.
Subscript
Solids can't move and have a definitive shape and volume because...
Their molecules are tightly packed together
These tell how many valence electrons an element has
Groups
In this type of reaction the energy released as products form is greater than the required amount of energy needed to break the bonds of the reactants
Exothermic Reaction
This tiny, crazy element does not follow the rules of science whatsoever and only has one valence electron
Hydrogen
A change in matter that makes one or more new substances, atoms are rearranged.
Chemical Change
As a gas turns into a liquid, then a solid, it _____ energy
Loses
The chemical bond formed when 2 atoms share an electron
Covalent Bond
A loaf of bread gets moldy, Lyle says its mass has decreased and has disappeared, is he correct?
No
This element is very, very expensive and you can shape it with your own hands when it's pure
Gold
A mixture of two or more elements, one of them being a metal.
Alloy
This is what allows phase changes to occur
Temperature
This group is the least reactive on the periodic table, having 8 electrons
Noble Gases
In a chemical reaction, when liquids mix this may form
Precipitate
This family of elements gets more reactive the further down you go
Alkali Metals
An inward force between molecules in a liquid that brings the molecules on the surface closer together.
Surface Tension
Three examples of crystalline solids
Salt, sugar, and snow
Two atoms each fighting for an electron not sharing it is called
A Polar Bond
When two or more compounds or elements join together to make a more complex substance, it is called...
Synthesis
There are ___ known elements on the periodic table
118