Notes

Tennessee SPI Objective:Classify common substances as elements or

compounds based on their symbols or formulas

Science

Essential LearningStudents will classify substances as elements orcompounds per their chemical symbols orchemical formulas.

Essential Question(s)How do I interpret chemical symbols and chemicalformulas to classify substances as elementsor compounds?

SPI 0807.9.3 Elements and Compounds

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Notes SPI 0807.9.3 Elements and Compounds

What Is An Element? Each individual element is a unique particle called an atom So in other words… elements are the different types of atoms An element is a pure substance that CANNOT be broken down into a simpler substance by CHEMICAL means. In other words…you CANNOT change one element into a different element with a chemical reaction

ExampleLithium is an element.

Here is one lithium atom.

3

LiLithium

6.9

Science

Examples of Elements

Notes SPI 0807.9.3 Elements and Compounds Science

H

Na

Ca

-represents one sodium atom

-represents one hydrogen atom

-represents one calcium atom

The element hydrogen

The element sodium

The element calcium

More About Elements The chemical symbols for elements always start

with one capital letter These chemical symbols can be followed by one(or more) lower case letters

Ex: B, C, N, O, F, etc

Ex: He, Li, Be, Mg, etc

Sodium and Chlorine

Carbon and Oxygen

Carbon, Hydrogen, & Oxygen

Notes SPI 0807.9.3 Elements and Compounds Science

NaCl

CO2

C6H12O6

(Sodium Chloride

(Carbon Dioxide)

(Glucose)

What Is a Compound? …consists of two or more different elements that are

chemically bonded via a chemical reaction to form a new substance.

The properties of the new substance are different from the substances that you started with.

Examples of Compounds

…note that it has more than 1 capital letter

…note that it has more than 1 capital letter

…note that it has more than 1 capital letter

Notes SPI 0807.9.3 Elements and Compounds Science

Examples of Compounds

H2O

C12H22O11

CH3COOH

Chemical formulas for compounds always contain more than one capital letter.

This is the compound called water

This is the acidic compound called vinegar

This the compound called table sugar

This is how you can tell the difference between an element and a compound… count the number of capital letters!

More About Compounds

Is this an element or a compound?Write a capital E if you think it is an elementWrite a capital C if you think it is a compound

Cs(Cesium)

Why?...is a pure substance, consists of only one type of atomHow to tell?...It only has one capital letter!

Element

Review Activity

SPI 0807.9.3 Elements and Compounds Science

F.Y.I.Used to regulate the

seconds in atomic clocks

F.Y.I.Used for creating

electricity from light in photoelectric

cells/solar panels

Is this an element or a compound?Write a capital E if you think it is an elementWrite a capital C if you think it is a compound

NaCl(Sodium Chloride)

Why?... Has 2 different types of atoms bonded together How to tell?...It has more than one capital letter!

Compound

Review Activity

SPI 0807.9.3 Elements and Compounds Science

F.Y.I.This is the substance that you sprinkle on your French Fries

F.Y.I.This compound is commonly called TABLE SALT

Is this an element or a compound?Write a capital E if you think it is an elementWrite a capital C if you think it is a compound

Fe(Iron)

Why?...is a pure substance, consists of only one type of atomHow to tell?...It only has one capital letter!

Element

Review Activity

SPI 0807.9.3 Elements and Compounds Science

F.Y.I.6000 years ago:

tools and weapons were first made out of

iron.

F.Y.I.4000 years ago:

people mixed iron & carbon to create steel.

Is this an element or a compound?Write a capital E if you think it is an elementWrite a capital C if you think it is a compound

MgCl2

(Magnesium Chloride)Why?... has 2 different types of atoms bonded together

How to tell?...It has more than one capital letter!

Compound

Review Activity

SPI 0807.9.3 Elements and Compounds Science

F.Y.I.Used for dust control on dirt roads and to reduce wind erosion

of soil.

F.Y.I.Use for de-icing roads, sidewalks, driveways

and parking lots.

Here is an example of a question you might see on a quiz or test.

Questions Science

Sample Question

SPI 0807.9.3 Elements and Compounds

Here is an example of a question you might see on a quiz or test.

Questions Science

Sample Question

SPI 0807.9.3 Elements and Compounds

Here is an example of a question you might see on a quiz or test.

Questions Science

Sample Question

SPI 0807.9.3 Elements and Compounds

Here is an example of a question you might see on a quiz or test.

Questions Science

Sample Question

SPI 0807.9.3 Elements and Compounds

Here is an example of a question you might see on a quiz or test.

Questions Science

Sample Question

SPI 0807.9.3 Elements and Compounds