air (tell me if it is an element, compound, or mixture)
What is a mixture?
100
DAILY DOUBLE: Name one thing that affects density at the atomic level.
What is mass, size, or arrangement of atoms?
100
part of an atom with a negative charge
What is an electron?
200
rusting
What is chemical change?
200
the number of valence electrons in elements of Group 2
What is 2?
200
the smallest amount of a compound that still retains the properties of that compound
What is a molecule?
200
what will happen to an object with a density less than 1.0 g/mL when placed in water
What is float?
200
what an atom is called if it has more electrons than protons
What is a negative ion?
300
freezing
What is physical change?
300
the number of energy levels for elements in period 3.
What is 3?
300
the smallest amount of an element that retains the characteristics of that element
What is an atom?
300
formula for density
What is density = mass / volume?
300
DAILY DOUBLE: Pick which is true about changing the number of neutrons: 1) changes the charge of the atom, 2) changes the atomic mass, 3) changes the atomic number
What is "changes the atomic mass"?
400
a sign of a chemical change
What is change in odor, change in energy, change in color, formation of a gas, formation of a precipitate
400
the group that does not react
What is group 8 (or the noble gases)?
400
this can be physically separated
What is a mixture?
400
units of density
What is g/mL or g/cm^3?
400
there must be equal amounts of these particles for an atom to be neutral
What are protons and electrons?
500
proof that a change is physical
What is the chemical composition stays the same?
500
the periodic table is arranged in order of this
What is atomic number?
500
category that contains elements and compounds
What is a pure substance?
500
method for determining the volume of an irregularly shaped object
What is water displacement?
500
how to find the number of neutrons from information on the periodic table