Elements and
Periodic Table
Periodic Table
The atomic structure is describe as
Protons and neutrons in the nucleus.
Electron around the nucleus. (Electron Cloud)
Another name for a solution is ________.
A Homogenous Mixture
______ should be conserved in a chemical reaction.
Mass
To convert grams to molecules you need ______ and ________.
Molar mass (g/mol)
Avogadro's Number (6.02 X 1023)
A radioisotope is
An isotope that has an unstable nucleus that undergoes radioactive decay.
An atom of the same element with a different number of neutrons.
The solvent is
The dissolving medium (substance that is doing the dissolving)
___________ occurs when bonds are broken during a chemical reaction.
Energy is absorbed (Endothermic)
There are _____ moles in 30 grams of Sulfur.
0.9 moles of Sulfur.
Gamma decay is different than Beta decay because
(Give at least 2 ways)
1. Gamma decay releases a gamma ray (high energy photon)
2. Beta decay emits a proton and beta particle
3. Gamma radiation penetrates and travels farther
The mass number is
The sum of the protons and neutrons
Aqueous means
Dissolved in water
______ must occur to separate the elements of a compound.
A chemical change
There are ______ moles in 5.62 X 10 24 atoms of zinc.
9.34 moles of zinc
During a Nuclear reaction the __________ is changed.
The composition if the nucleus.
Molar mass is the mass in grams per one mole of substance.
Mass number- is the number given when you have an isotope. Mass #= #protons + # neutrons
Atomic Mass- is the average mass of all of the naturally occurring elements
The difference between a unsaturated, saturated, and supersaturated solutions is _________.
Unsaturated solution < Max amount of Solute
Saturates = Max amount of Solute
Super Saturated > Max amount of Solute
The difference is the amount of solute present in the solvent.
Balance this chemical reaction:
H2SO4 + Cl2 ----> HCl + SO4
H2SO4 + Cl2 ----> 2HCl + SO4
How many Sig Figs are present?
00.000081002
5
The Nuclear symbol for an element with 42 protons, 45 neutrons, and 42 electrons is?
8742 Mo
The charges of each subatomic particle are __, ___, and ___.
# of Protons give the ____
# of Neutrons differ in a ____
# of Electron differ in a ____
+, -, 0
Identity
Isotope
Ion
Describe the particles of a liquid.
Relatively close, move at a moderate speed, and they can move around each other.
A chemical reaction differs from a nuclear reaction because
A chemical reaction occurs between the valence electrons of two atoms a nuclear reaction occurs in the nucleus of an atom.
Write the answer with the correct number of sig figs.
12% is Iron-55, and 88% is iron-56. What is the weighted average of the iron sample?
56
The parts of a nuclear symbol are__________ and located _______
Mass number - Superscript to the left
Atomic Number- Subscript to the Left
Chemical element on the right