Physical or Chemical
When this change takes place, the chemical composition of the matter changes.
Chemical Change
This subatomic particle has a negative charge(-1)
Electron
A pure substance made of only one kind of atom is called
An Element
Who is the father of the Periodic Table?
Dmitri Mendeleev
The Atomic Number is also the number of
(hint: 2 subatomic particles)
Protons and Electrons
When a piece of wood is chopped in half?
Physical Change
Where are Protons and Neutrons found?
The Nucleus
Two or more elements that are chemically bonded is called a
Compound
How many groups are on the Periodic Table
18
Groups 3 through 12 on the Periodic Table are called?
Transition Metals
When water evaporates
Physical Change
Where are Electrons found?
The Electron Cloud, orbiting the Nucleus
Which is an example of a homogeneous mixture?
A) A pepperoni pizza
B) Dirt
C) Milk
C) Milk
As you move from left to right on the Periodic Table, the reactivity_______________.
Decreases
Elements on the Periodic Table are organized by
Atomic Number
This type of change produces something new
Chemical Change
What charge do Neutrons have?
Neutral or No Charge
This type of mixture is not uniformed and you can distinguish the different parts.
Heterogeneous Mixture
There are _____ periods on the periodic table and they are organized horizontally in _______.
7, Rows
If a Chemical Reaction takes place and the mass of the atoms in the product is less than those in the reactants, in what type of system did the reaction take place?
An Open System
Name 3 ways to know a Chemical Change has take place
Heat is released, bubbles are formed, an unexpected color change, formation of a precipitate
Valence Electrons
Which of the following is a mixture?
A) Water B) Hydrogen C) Air D) Salt
C) Air
Name the most reactive group and least reactive group on the Periodic Table.
Alkali Metals, Noble Gases
What is the Law of Conservation of Mass
the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction