Thursday March 5, 2015

Warm Up: Journals today

Describe the law of conservation of mass.

http://youtube.com/v/b8oHRmOIm8k

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 MassElectrons- 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 colorforms a solid (precipitate)produces a gasproduces 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.)