Primera ley
Segunda Ley
Ciclos
Criterios de
Eficiencia
Eficiencia
Propiedades
Aplicaciones
100
What are the horizontal rows on the periodic table called ?
Periods
100
The simplest form of matter is the
Atom
100
He created the Periodic Table
Mendeleev
100
Define the following terms:
Fission
Fusion
fission - Splitting of a nucleus
Fusion - joining of 2 nuclei
100
What is an Ionic Bond?
A bond where electrons are transferred between a metal and a nonmetal.
100
Reactions that release energy
Exothermic
200
What is atomic mass ?
total weight of protons and neutrons
200
What does this diagram represent
A heating Curve
200
What did J.J Thompson do ?
used the cathode ray tube to discover electrons
200
what does this symbol represent
Alpha particle or Alpha decay
200
A diagram representing the Valence electrons of an element or compound
Lewis dot structure
200
When elements or molecules switch places
AC + BD ----->AB + CD
Replacement reaction
300
What is Bohr's Diagram ?
a diagram of an atom which includes all protons, neutrons, electron shells, and electrons
300
When a substance is changing from a solid to a liquid, what type of energy exists?
What is this transition called?
Potential energy exists when a substance is changing from a S- L.
This transition is called a phase change.
300
He was known for his gold foil experiment- fired negative ions at thin sheet of gold foil, discovered the atomic nucleus and proposed a nuclear model of the atom , who is he ?
Ernest Rutherford
300
An atom with 8 protons, 8 neutrons, and 8 electrons is an atom of this element.
Oxygen
300
What type of bond is produced by sharing electrons?
Covalent bonds
300
Anything that has mass and volume
Matter
400
What is an element ?
A molecule composed of one kind of atom; cannot be broken into simpler units by chemical reactions.
400
Give an example of an element and a compound
Is Water Heterogeneous or Homogeneous?
Are Fruit loops Heterogeneous or Homogeneous?
Element = Carbon.....
Compound = H2O
Water = homogeneous
Fruit loops = Hetereogenous
400
Thompson's model was called ?
The Plum Pudding Model
400
33. Radium-226 decays by alpha decay to
A) barium-131. B) cobalt-60.
C) radon-222. D) polonium-218.
C
400
What is electronegativity? What type elements will have low electronegativity? WHat type of elements will have a high electronegativity?
The desire to gain electrons. Metals have low electronegativity and non metals have High electronegativity.
400
A substance present before a chemical change
Reactant
500
What are the elements in Group 18 called ?
Noble Gases
500
What are the 3 subatomic particles and where are they located?
Neutrons - inside the nucleus
Electrons - outside the nucleus
Protons - Inside the nucleus
500
Who Was Democritus?
Greek philosopher that said all matter is made of tiny, indestructible particles called atoms
500
46. Sodium-24 has a half-life of 15 hours. How many hours is three half-lives?
A) 60 hours B) 45 hours
C) 30 hours D) 15 hours
E) 7.5 hour
B
500
What are 2 ways to identify a bond as ionic or covalent?
1. Determine types of elements that are bonding
m + nm = ionic
nm +nm = covalent
Electronegativity Difference greater than 1.7 = ionic
less than 1.7 = covalent
500
The product of a neutralization reaction.
Salt