This is a pure substance that can't be broken down into simpler substances. In it's smallest form, it is at least an atom. We have a table to represent all the known ones.
What is an element?
100
Water freezing is an example of this type of change.
What is a physical change?
100
Water.
What is H20?
100
KCl.
What is potassium chloride?
100
This is the model we draw that represents the arrangement of electrons in orbits around the nucleus of an atom.
What is the Bohr-Rutherford model?
200
This is the name for the columns in the periodic table, they often share similar properties.
What is a group?
200
Metal oxidizing over time is an example of this type of change.
What is a chemical change?
200
Sodium Chlorides (salt).
What is NaCl?
200
Al2O8.
What is aluminum oxide?
200
This person is credited with creating the Periodic Table of Elements.
Who is Mendeleev?
300
This is a negatively charged ion.
What is an anion?
300
This an example of an element or substance that would likely undergo a physical change if brought into contact with water
What is a sponge?
300
Calcium hydroxide.
What is Ca(OH)2?
300
Na(NO2)
What is sodium nitrate?
300
A bond where electrons are "shared" by multiple atoms.
What is a covalent bond?
400
This is the name of the 2nd group in the periodic table of elements.
What are the Alkali Earth Metals?
400
This is an example of an element or substance that would likely have a chemical reaction if put in contact with water.
What is sodium?
400
Dinitrogen Pentaoxide.
What is N2O5?
400
SO3.
What is sulfur trioxide?
400
This is an example of a pair of elements whose Lewis Dot diagram would involve lines to represent shared electrons instead of arrows to represent "given" electrons.
What is carbon and chlorine (answers may vary)?
500
This is a pure substance made from two or more non-metals.
What is a molecular compound?
500
These are five signs to look for as possible evidence of a chemical change.
What are a new color appearing, a precipitate, heat or light being absorbed or produced, bubbles of gas, and difficulty of reversing the change?