The Atom
These are the basic building blocks of matter.
Atoms
What are elements?
Elements are basic substances of matter.
What is a chemical reaction?
A chemical reaction is the process in which atoms are rearranged to produce new substances.
Number of atoms of each element in H2O?
2 Hydrogen atoms
1 Oxygen atoms
A chemical dissolves in water. What type of change is this?
physical change
These are found are found in the nucleus and and have no charge
Neutrons
what is the chemical symbol of Gold?
Au
What are signs of a chemical reaction?
Color change, odor change, precipitate formation, and appearance of gas bubbles.
what is the chemical symbol of Gold?
Au is the chemical symbol for Gold
chemical reactions
Protons have a ___________ charge and are found in the nucleus
positive
rows = periods
columns = groups
True
True or False: To balance a chemical reaction you can change subscripts or coefficients.
False ...only coefficients
You draw and color on a piece of paper then fold into a swan. What type of changes have you done?
Physical changes
Electrons have a Negative charge and are located in the ________?
energy shells
What information does each square contain on the periodic table?
The atomic number, chemical symbol, chemical name, and average atomic mass.
products
A _______ is placed in front of a chemical equation.
Coefficient
What determines how reactive an atom is?
The number of valence electrons
In a Neutral Atom the number of Electrons is equal the number of _________
What are Protons?
How are the elements arranged on the periodic table?
Increasing atomic number
What does the Law of Conservation of Mass state?
The Law of Conservation of Mass states that matter is neither created nor destroyed.
True/False: Some elements have the same atomic number.
False
Bohr's planetary model