Classifying matter elements compounds and mixtures
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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?  

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Classifying matter elements compounds and mixtures

Ms. Ward 8th Grade Science

Classifying Matter:Elements, Compounds, and Mixtures


Bell ringer

(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


Objective

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

Objective


Cake ingredients video clip

Cake Ingredients Video Clip


Classifying matter elements compounds and mixtures

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

5


Element

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

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

  • 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


Mixture

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


Can you identify the following

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?


Element compound or mixture

Rocks

Element, Compound, or Mixture?


Element compound or mixture1

Rocks

Element, Compound, or Mixture?


Element compound or mixture2

Copper

Element, Compound, or Mixture?


Element compound or mixture3

Copper

Element, Compound, or Mixture?


Element compound or mixture4

Jelly Beans

Element, Compound, or Mixture?


Element compound or mixture5

Jelly Beans

Element, Compound, or Mixture?


Element compound or mixture6

Table Sugar

Element, Compound, or Mixture?


Element compound or mixture7

Table Sugar

Element, Compound, or Mixture?


Element compound or mixture8

Diamond

Element, Compound, or Mixture?


Element compound or mixture9

Diamond

Element, Compound, or Mixture?


Element compound or mixture10

Tea

Element, Compound, or Mixture?


Element compound or mixture11

Tea

Element, Compound, or Mixture?


Element compound or mixture12

Salt

Element, Compound, or Mixture?


Element compound or mixture13

Salt

Element, Compound, or Mixture?


Element compound or mixture14

Neon Gas

Element, Compound, or Mixture?


Element compound or mixture15

Neon Gas

Element, Compound, or Mixture?


Element compound or mixture16

Salad

Element, Compound, or Mixture?


Element compound or mixture17

Salad

Element, Compound, or Mixture?


Element compound or mixture18

Pure Water

Element, Compound, or Mixture?


Element compound or mixture19

Pure Water

Element, Compound, or Mixture?


Element compound or mixture20

Aluminum

Element, Compound, or Mixture?


Element compound or mixture21

Aluminum

Element, Compound, or Mixture?


Element compound or mixture22

Lemonade

Element, Compound, or Mixture?


Element compound or mixture23

Lemonade

Element, Compound, or Mixture?


Element compound or mixture24

Silver

Element, Compound, or Mixture?


Element compound or mixture25

Silver

Element, Compound, or Mixture?


Element compound or mixture26

Sand

Element, Compound, or Mixture?


Element compound or mixture27

Sand

Element, Compound, or Mixture?


Write up

Write-Up

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

39


Closure

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


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