Classifying matter elements compounds and mixtures
Sponsored Links
This presentation is the property of its rightful owner.
1 / 40

Classifying Matter: Elements, Compounds, and Mixtures PowerPoint PPT Presentation


  • 142 Views
  • Uploaded on
  • Presentation posted in: General

Ms. Ward 8 th Grade Science. Classifying Matter: Elements, Compounds, and Mixtures. (1) The chemical formula for a substance called sodium nitrate is NaNO 3 . What elements make up sodium nitrate?  

Download Presentation

Classifying Matter: Elements, Compounds, and Mixtures

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Ms. Ward 8th Grade Science

Classifying Matter:Elements, Compounds, and Mixtures


(1) The chemical formula for a substance called sodium nitrate is NaNO3. What elements make up sodium nitrate?  

A. sodium and nobelium B. sodium and nitrogen  C. nitrogen and nobelium  D. sodium, nitrogen, and oxygen  

(2) Which of the following compounds contains the greatest number of atoms?  A. CO2  B. C22H46  C. C6H12O6  D. CH4

Bell Ringer


During this class, you will describe the difference between elements and compounds.

Objective


Cake Ingredients Video Clip


  • Take out a sheet of paper and make a chart like the example on the board.

5


Element

  • An element is a pure chemical substance made of same type of atom.

  • Elements are distinguished by their atomic number (number of protons in their nucleus).

  • Elements cannot be broken down into simpler substances by chemical reactions.

  • There are about 117 elements that have been observed. Can be classified as metal, non-metal or metalloid.

  • An element is represented using symbols.

  • Argon (Ar), Hydrogen (H), Fluorine (F), copper (Cu), Sodium (Na), Oxygen (O), Zinc (Zn)

6


Compound

  • A compound contains atoms of different elements chemically combined together in a fixed ratio.

  • Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds.

  • A compound can be separated into simpler substances by chemical methods/reactions.

  • A compound is represented using a formula.

  • Water (H2O), Sodium chloride-Table Salt (NaCl), Carbon Dioxide (CO2), Methane (CH4), Glucose (C6H12O6)

7


Molecule

  • MOLECULE - a group of at least two atoms in a definite arrangement held together by chemical bonds. A molecule may consist of atoms of a single element, as with nitrogen (N2), or of different elements, as with water (H2O). Some molecules can be called compounds, but NOT all.

  • Examples of MOLECULES (using symbols) are…

  • O2 (oxygen)

  • C12H22O11 (sugar)

  • N2 (nitrogen)

  • H2O (water)

  • C2H6O (alcohol)

  • P4S3 (match heads)

  • C8H9NO2 (tylenol)

  • H2 (hydrogen)

  • CS2 (insecticide)

  • KClO3 (disinfectant)

8


A combination of two or more pure substances that are not chemically combined.

substances held together by physical forces, not chemical

No chemical change takes place

Each item retains its properties

in the mixture

They can be separated physically

Mixture

Chem4kids.com


You will be shown a series of photos. Tell if each photo represents an item composed of an element, compound, or mixture.

Review:

An element contains just one type of atom.

A compound contains two or more different atoms joined together.

A mixture contains two or more different substances that are only physically joined together, not chemically.

A mixture can contain both elements and compounds.

Can you identify the following?


Rocks

Element, Compound, or Mixture?


Rocks

Element, Compound, or Mixture?


Copper

Element, Compound, or Mixture?


Copper

Element, Compound, or Mixture?


Jelly Beans

Element, Compound, or Mixture?


Jelly Beans

Element, Compound, or Mixture?


Table Sugar

Element, Compound, or Mixture?


Table Sugar

Element, Compound, or Mixture?


Diamond

Element, Compound, or Mixture?


Diamond

Element, Compound, or Mixture?


Tea

Element, Compound, or Mixture?


Tea

Element, Compound, or Mixture?


Salt

Element, Compound, or Mixture?


Salt

Element, Compound, or Mixture?


Neon Gas

Element, Compound, or Mixture?


Neon Gas

Element, Compound, or Mixture?


Salad

Element, Compound, or Mixture?


Salad

Element, Compound, or Mixture?


Pure Water

Element, Compound, or Mixture?


Pure Water

Element, Compound, or Mixture?


Aluminum

Element, Compound, or Mixture?


Aluminum

Element, Compound, or Mixture?


Lemonade

Element, Compound, or Mixture?


Lemonade

Element, Compound, or Mixture?


Silver

Element, Compound, or Mixture?


Silver

Element, Compound, or Mixture?


Sand

Element, Compound, or Mixture?


Sand

Element, Compound, or Mixture?


Write-Up

  • Compare and Contrast Elements vs. Compounds in complete sentences. Summarize what you have written in about three to four sentences.

39


During this class period, you described the difference between elements and compounds.

What is an element?

What is a compound?

Tomorrow, you willdemonstrate your knowledge on common chemical symbols and formulas and describe the difference between elements and compounds. (DOK 2, 2a)

Closure


  • Login