Matter
Popping popcorn: physical or chemical
What is a chemical change?
Elements are identified by....?
What is atomic number?
To calculate the number of neutrons, you...?
What is subtract atomic number from atomic mass?
Two nonmetals form this kind of bond that shares electrons.
What is a covalent bond?
The enthalpy of a reaction is the ___________ minus the __________.
What is products minus reactants?
The only type of homogeneous mixture
What is a solution?
Group numbers give us what information?
What are valence electrons?
In an neutral atom, which subatomic particle equals the number of protons?
What is an electron?
One mole of any element is equal to its
What is atomic mass?
The average kinetic energy of a substance is measured by...?
What is temperature?
This metallic property means it is easily hammered into a flat sheet
What is malleable?
Most of the elements on the periodic table are....?
What are metals?
Thomson and Millikan studied which subatomic particle?
What are electrons?
1 mole equals this many atoms or molecules
What is 6.02 x 1023 ? Avogadro's number!
In a gas, when temperature increases, what variables also increase?
What is volume and pressure?
Endo or exothermic: freezing
What is exothermic?
Cations are formed by...?
What are metals?
The results of Rutherford's Gold Foil experiment.
What is the nucleus?
What is the positive mass of the atom?
What is the proton?
To balance equations, we use a number called.....
What is a coefficient?
A solution that contains 1 x 10-8 OH- ions has a pH of...?
What is 6? (an acid)
This property of water allows insects to walk on it
What is surface area?
Fluorine, Chlorine, Bromine and Iodine can be characterized by....
What are the halogens?
What are diatomic molecules?
What is 7 valence electrons?
Atoms with the same number of protons, but different numbers of neutrons are called...
What are isotopes?
The formation of bonds ______ energy
What is release?
Where do nuclear reactions occur?
What is in the nucleus?