Chemical and Physical
What is a chemical change?
original substance is changed chemically and this is most likely irreversible
What are 3 subatomic particles found in an atom?
proton, neutron, electron
MgCl2
magnesium chloride
define an Ion
Charged atom, different number of electrons
Define a covalent bond
two elements sharing an electron or electrons
Give n example of a physical change or physical property
dissolving, changing state (solid to liquid via melting), cutting something in half or melting point, freezing point, mass, volume....
Which particles have a charge?
protons and electrons
What is the formula for dihydrogen monoxide?
H2O
what is an ionic bond?
The bond between a positively charged Ion and a negatively charged Ion. Usually a metal and a non metal.
Covalent bonds usually form between what 2 types of elements?
nonmetals
what are 3 signs of a chemical change?
creating of odor, producing heat, changing color, fizzing/bubbling which produces gas....
Isotopes different in the amount of which subatomic particle?
neutrons which have mass but no charge.
What is the name of P2F6?
Diphosphorus Hexaflouride
What is the name for an ion that gives electrons, receive electrons?
Cation, Anion
Why do covalent bonds form?
so the elements can become stable by sharing electrons to = 8 dots or outer electrons for each element.
What is the major difference between a physical and chemical change?
one can be reversed and one not. (most of the time)
Electrons reside in what place in the atom (when referencing the Bohr model)?
energy levels, rings, or orbitals of the Bohr mode
What is the formula for Calcium and Nitrogen?
Ca3N2
What happens to electrons in Ionic bonds?
They are given from the cation (metal) to the anion (nonmetal) so the nonmetal can have 8 outermost electrons
Describe a few properties of Covalent Bonded molecules
Very low melting points, does not conduct electricity, soluble in water
What are is a common chemical properties of metals?
Think about the PT lab when we had different metals and nonmetals....
reactivity with acid
corrosion or reactivity with air/oxygen/water
Why is the atomic mass not always an exact number?
Atomic mass is an average of the mass of all the isotopes of that element.
What is the name of CaCO3 ? Use the reference packet on page 1 for the polyatomic ions list
Calcium carbonate
What are 2 of the properties of Ionic compounds?
Conduct electricity, Very high melting points, solid at room temp, soluble in water
How many total electrons are there in Carbon Dioxide?
C= 4 dots
O=6 dots
O= 6 dots
They share all 16 so they can all have 8 dots or electrons in the outermost level and become stable.