Chemistry Unit Test Flashcards
Electrons have what charge and are found where?
Negative, outside of nucleus
Protons have what charge and are found where?
Positive, nucleus
Atoms have a nucleus made up of what 3 things?
Protons, neutrons, and electrons
Diatomic molecule means:
2 atoms bonded to each other
Neutrons have a charge of what and are found where?
Neutral, nucleus
What is a valence shell?
The outermost shell of an atom where the electrons are placed
What is a balanced equation?
The charge is the same for the reactants and products
What is a period?
A row in the periodic table
What is a stable octet?
When the atom is surrounded by 8 electrons
What is a cation? How is it formed?
A positively charged ion that is formed when a metal loses electrons
What is an anion?
Negatively charged ion, opposite of cation
What is a multivalent?
Able to combine with 3 or more atoms when forming a compound
What is the Law Of Conservation Of Mass
The mass of reactants must equal the products
What are reactants? What do they create?
The starting materials in a reaction that create a chemical change
What are products?
The thing formed from the reactants
What is a polyatomic?
Contains 3 or more atoms of an element
Endothermic reaction is
Energy is absorbed and surroundings get colder
Exothermic reaction is
Heat is released
PH less than 7 =
Acid
PH of 7 =
Neutral (water)
PH more than 7 =
Base
Which side are non metals and metals on in the periodic table?
Metals: left
Non-metals: right
How to find neutrons:
Mass # minus atomic #
If litmus paper is blue it is
A base and above a PH of 7
