physical and chemical changes
what is a physical change
A physical change alters the form or appearance of a substance without changing its chemical composition.
What are the three main subatomic particles?
Protons, neutrons, and electrons.
Who is considered the pioneer of the periodic table?
Dmitri Mendeleev.
What is an element?
A specific type of atom that cannot be broken down into simpler substances by chemical means.
Give an example of a change in state of matter.
Ice melting or water boiling.
Where are protons located in an atom?
In the nucleus.
How are elements arranged in the periodic table?
In order of increasing atomic number.
What is the chemical symbol for gold?
Au.
What is a sign of a chemical change related to temperature?
An unexpected temperature change, such as a hand warmer releasing heat.
How do you calculate the number of neutrons in an atom?
Neutrons = Mass Number - Atomic Number.
What are vertical columns in the periodic table calleD?
Groups.
Name a common element symbol and its element.
H for hydrogen.
Give an example of a physical change
change in color, shape, tecture
What is the charge of electrons?
Negatively charged.
WHAT ARE THE HORIZONTAL ROWS ON A PERIODIC TABLE CALLED?
PERIODS
How is the symbol for an element written?
The first letter is capitalized, and any subsequent letters are lowercase.
What is a precipitate?
A solid that forms in a liquid during a chemical reaction, like souring milk.
What does the atomic number represent?
The number of protons in an atom.
WHAT DOES THE ATOMIC NUMBER TELL YOU
THE NUMBER OF PROTONS IN AN ATOM
Name an element and its symbol that has a full valence electron shell
anything from group 8(18)