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3 Chemistry Assess


A molecule is chemically combined
An example of a homogeneous mixture is salt water
An example of a heterogeneous mixture is concrete
The “best mixed” of all mixtures is a solutions
The smallest particle of an element that has the properties of that element is a(an) atom
a shorthand way of representing the chemical elements Chemical symbols
The description of a chemical reaction using symbols and formulas is called a chemical equation
A substance that is made up of more than one kind of molecule is called is a (an) mixture
In sweetened tea, the sugar is called the solute
A substance that dissolves in water is said to be soluble
Water in salt water would be the solvent
To increase the solubility of sugar in water you would increase or decrease the temp increase
Electron's Charge Negative
Positively charged particle in the nucleus of an atom is the Proton
Neutron's Charge Neutral
The number of protons in the nucleus of an atom is called the atomic number
The sum of protons and neutrons in the nucleus of an atom is called the atomic mass
The nucleus of an atom contains protons and neutrons
These forces explains that there is a force of attraction between all objects in nature. gravity
These forces explain repulsion and attraction. electromagnetic
These forces are responsible for radioactivity decay. Weak
These force hold proton together. Strong
The number at the top of each square in the periodic table is the (= number of protons) Atomic Number
The horizontal rows of elements in the periodic table are periods
The elements to the left of the stair like dark line on the periodic table Metals
Elements within the same vertical column Family
The elements in a period are arranged in order by # of electron Valences
Elements in the same family of the periodic table have similar properties
The two rows that stand alone at the bottom of the periodic table are rare-earth elements
The periodic table is arranged by all the known elements in order of increasing atomic number
Most of the elements on the periodic table are metals
The noble gases are inactive because their outermost energy level is full
In chemical combinations, non-metals tend to gain electrons
Share the properties of Metals and Non-metals Metalloids
Elements in Group 15 would have how many valences electrons? 5
Moving left to right on the periodic table the elements tend to decrease in activity
Luster Metal
Poor Conductors Non-metal
Ductile / Malleable Metal
Tend to rust or oxidize Metals
Gain Electrons Non-Metals
High Melting Point Metals
Created by: huizenga