atom antics
the center of an atom containing protons and neutrons
nucleus
the horizontal rows on the periodic table
period
this property describes how easily a substance catches fire
flammability
this law states that matter cannot be created or destroyed
law of conservation of mass
A mixtrue where you can clearly see the different parts (like a salad)
Heterogeneous
the subatomic particles have a negative charge and orbit the nucleus
electrons
elements in the same "group" or "family" share these
chemical properties
boiling water is this type of change
physical
the substance you start with in a chemical reaction
A mixture that looks the same throughout (like salt water)
Homogeneous
the number of these determine the identity of an element
protons
this group of elements is "noble" because they don't react with others
noble gases
rusting of iron is this type of change
chemical
a reaction that releases heat feeling warm to the touch
exothermic
The substance that gets dissolved in a solution (like the sugar)
solute
atoms of the same element with different numbers of neutrons
isotopes
these elements are found on the "star-step" line
metalloids
density is calculated by dividing mass by this
volume
if 10g of a reacts with 5g of b the products mass will be this
15g
This is the universal solvent dissolves so many things
water
the outermost electrons involved in chemical bonding
valence electrons
this metal is the only one that is liquid at room temperature
mercury
bubbles , heat, and color changes are all signs of this
chemical reaction
a reaction that absorbs heat feeling cold to the touch
endothermic
A pure substance made of two or more elements chemically combined
Compound