Directions:

Click “Slideshow” then “From Beginning” to view this slideshow properly.

Take notes and answer questions from every page. Include subheadings for each separate topic.

Write down any questions you have about something you may not understand.

Elements & Compounds Lab Reassessment Review

Objectives:1.There are billions of materials in our universe.2.Those pure materials are called elements which are represented by a symbol and models.3.Elements combine in thousands of ways to make compounds which are represented by formulas and models.

Elements & Compounds

An element is a substance that is made from one kind of atom only. It cannot be broken down into simpler substances.

An element

An element

atom atom

A compound is a substance that is made from two or more elements that chemically join.

atom atom

A compound made up of 2 different elements

A compound made up of 7 different elements

Although it is very difficult, because a compound is made of more than one element it can be broken down into those separate elements.

A compound made up of 3 different elements

An element

An element

An element

Material Made up of: Element or compound

Water Hydrogen and Oxygen

compound

Coal Carbon element

Carbon dioxide

Carbon and Oxygen

compound

Oxygen Oxygen element

Chalk Calcium, Carbon & Oxygen

compound

Wax Carbon & Hydrogen

compound

Table salt Sodium & Chlorine compound

Caffeine Carbon, Hydrogen, Nitrogen & Oxygen

compound

Material Made up of: Element or compound

Water Hydrogen and Oxygen

compound

Coal Carbon element

Carbon dioxide

Carbon and Oxygen

compound

Oxygen Oxygen element

Chalk Calcium, Carbon & Oxygen

compound

Wax Carbon & Hydrogen

compound

Table salt Sodium & Chlorine compound

Caffeine Carbon, Hydrogen, Nitrogen & Oxygen

compound

Objective:

To learn the symbols and recognize models of elements and compounds.

Representing Elements & Compounds

Look in your periodic table and find the symbols that represent the following

elements:Sodium ……..

Iron ………..

Hydrogen ………..

Chlorine ………..

Carbon …………

Now look in your periodic table and find name that corresponds to the following symbol:Fe ……..

Mg ………..

Br ………..

K ………..

Li …………

Can you answer these???

Q1. The symbol of Nitrogen is:a. Na b. N c. Ni

Q2. Hg is the symbol of:a.Hydrogenb. Helium c. Mercury

Q3. Water is not in the periodic table because:a. It is a liquid substance b. It is a natural substancec. It is a compound not an element

Yes!!!

Q1. The symbol of Nitrogen is:a. Na b. N c. Ni

Q2. Hg is the symbol of:a.Hydrogenb. Helium c. Mercury

Q3. Water is not in the periodic table because:a. It is a liquid substance b. It is a natural substancec. It is a compound not an element

Modeling Elements Elements can also be represented by models. Because they are made of only one type of atom they will be represented by all the same shapes and colors.

H2 = Hydrogen

O2 = Oxygen

H H

O O

Modeling CompoundsWhen different elements combine they will create a compound and usually are represented by a different shape or color.

Cu

SO

O

O

Compounds are also represented by chemical

formulas by combining the element symbols that make

them up.What elements make up this

compound?

MgCl2

1 magnesium and 2 chlorine

AgNO3

What elements make up this compound?

1 silver, 1 nitrogen, and 3 oxygen

Draw each and label it as an Element or a Compound AND explain why.

Now it’s your turn!

Create your own way to represent an element and a compound. You may draw it or build it but be sure to turn it in with your notes.Have fun!