Atoms & PT
This subatomic particle determines the identity of an atom.
What is a proton?
The dots in a Lewis diagram represent the outer electrons. What are these electrons called?
What are valence electrons?
This state has definite volume but not definite shape.
What is a liquid?
A + B -> AB is this reaction type.
What is synthesis?
This tells how many molecules you have in a formula.
What is the coefficient?
Rows on the periodic table are called this.
What are periods?
This is the number of valence electrons in oxygen.
What is 6?
This phase change is gas to liquid.
What is condensation?
AB + C -> AC + B is this reaction type.
What is single replacement?
In 2CO2 this is the number of oxygen atoms.
What is 4?
Elements in Group 17 usually have this many valence electrons.
What is 7?
This is the typical oxidation number for Group 2 elements.
What is +2?
Sugar dissolves in water and can be recovered after evaporation, so it is this kind of change.
What is a physical change?
A bond between a metal and a nonmetal is usually this.
What is an ionic bond?
In 3Ca(HCO3)2 this is the number of hydrogen atoms.
What is 6?
A neutral atom has a mass number of 35 and an atomic number of 17. How many electrons does it have?
What is 17?
Atoms tend to follow this rule to become stable with 8 valence electrons.
What is the octet rule?
Rusting is this kind of change.
What is a chemical change?
A bond where electrons are shared between atoms, represented by lines or circles (example H2O)
What is a covalent bond?
You cannot change these when balancing because it changes the substance.
What are subscripts?
A neutral atom has a mass number of 35 and an atomic number of 17. This is the number of neutrons.
What is 18?
Bohr models show this, while Lewis diagrams show only valence electrons.
What are all electrons in energy levels (or electron shells)?
Air is this type of mixture.
What is a homogeneous mixture?
Combustion reactions usually produce these two substances.
What are CO2 and H2O?
These are the coefficients that balance Al + O2 -> Al2O3.
What are 4, 3, and 2?