Thursday
March 5, 2015
Warm Up: Journals today
Describe the law of
conservation of mass.
Balanced or Unbalanced?
Use the steps to identify if the equations are
balanced or unbalanced.
10 minutes.
Create!
Today we will create a study guide for
your test on Monday.
8.5A
Describe the structure of atoms,
including the masses, electrical
charges, and locations, of protons and
neutrons in the nucleus and electrons
in the electron cloud.
Step 1:
Describe everything you know about atomic
structure….
You have 3 minutes.
The Essentials!
Protons- positive in the nucleus, identify the
element.
Neutrons- neutral and in the nucleus.
Protons+Neutrons= Atomic Mass
Electrons- negative, traveling outside of the
nucleus.
Energy shells (Bohr) vs. Electron Cloud
(modern)
8.5B
Identify that protons determine an element’s
identity and valence electrons determine its
chemical properties including reactivity.
Step 1:
Write everything you know about this standard.
You have 3 minutes!
The Essentials!
Valence electrons are the number of electrons
in the outermost shell of an atom.
The fewer the electrons, the more reactive.
To identify and element simply count the
protons in the nucleus and match it to the
atomic number!
8.5C
Interpret the arrangement of the
Periodic Table, including groups and
periods, to explain how properties are
used to classify elements.
The Essentials!
Groups- similar chemical properties.
Periods- increasing size, mass and atomic
number.
Left of stair step are metals, to the right they
are non-metals.
Arranged by increasing atomic number.
8.5D
Recognize that chemical formulas are used to
identify substances and determine the number
of atoms of each element in chemical formulas
containing subscripts.
The Essentials!
Subscripts- little number below.
Count the number of atoms in a formula!
8.5E
Investigate how evidence of chemical reactions
indicate that new substances with different
properties are formed.
The Essentials!
Signs of a chemical reaction:
produces heat (exothermic)
gets cooler (endothermic)
changes color
forms a solid (precipitate)
produces a gas
produces an odor
8.5F
Recognize whether a chemical equation
containing coefficients is balanced or not and
how that relates to the law of conservation of
mass.
The Essentials!
Coefficient- big number, represents the number of
molecules.
Is an equation balanced or not?
Law of conservation- matter is not created or destroyed, it
just changes forms!
Discuss...
“The concepts I find most difficult are…”
“The concepts I find easiest are…”
“lets ask Mrs. Maddry about…”
Fun with Analogies!
Use the following format to make analogies:
A _______ is like a _______ because…
(Make the comparison and explain the
relationship.)