Science Starter 11/1/16

• What do you think an element is? Give an example of something that you think might be an element.
• How do you think elements are identified?

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Lesson Objective:

• SWBAT define an element and a pure substance.
• SWBAT recognize an element by chemical symbols.

Elements & Atoms

• Elements are pure substances because they are made up of just one type of atom.

Atom:

• The smallest unit of matter.
• Atoms make up EVERYTHING around us.
• We are made up of atoms!

Elements

• Elements make up EVERYTHING in the universe.
• There are over 100 known elements on Earth.

Molecule

• A molecule is a group of two or more atoms.
• Can be identical- O₂ (an element)
• Can be different- H₂O (not an element)
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Periodic Table of Elements

• The periodic table of elements is the way we organize all the known elements in the universe.
• They are organized by their physical and chemical properties.

Think-Pair-Share

What are some patterns that you noticed?

• Each element has a chemical symbol, which is usually one or two letters representing the element.

Chemical Symbols

O

Oxygen

16

8

Si

Silicon

14

28

H

Hydrogen

1

1

Hg

Mercury

80

201

Chemical Symbols

• If the symbol is one letter, then the letter is always capitalized.

O

Oxygen

16

8

H

Hydrogen

1

1

1 letter chemical symbol, always capitalized

Chemical Symbols

• If the symbol is two letters, then the first letter is always capitalized and the second letter is always lowercase.

Hg

Mercury

80

201

Si

Silicon

14

28

2 lettered chemical symbol, 1^st is capital, 2^nd is lowercase

1-Letter Chemical Symbols

N

Nitrogen

7

14

C

Carbon

6

12

P

Phosphorous

15

31

F

Fluorine

9

19

K

Potassium

19

39

Sc

Scandium

21

45

Ag

Silver

47

108

He

Helium

2

4

Fe

Iron

26

56

Au

Gold

79

197

Ne

Neon

10

20

2-Letter Chemical Symbols:

• The chemical symbol represents each element on the periodic table.
• The symbols are also used to represent elements in chemical formulas and equations.

Chemical Symbols

+

=

Na (Sodium)

Cl (Chlorine)

NaCl (Sodium Chloride)

• Take another look at your periodic table.
• Write down 5 elements whose chemical symbol is only one capital letter, and 5 elements whose chemical symbol is one capital letter and one lower case letter.

• How many elements are in the following substances?

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H₂O CON₃ CaO NeCa

How many elements are in the following chemical formula?

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NH₃

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Which of the following examples is an element?

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NH₄ or Ne?

Summary

Today’s lesson was about_____________.

One key idea was__________. This idea was

important because_____________. A second

key idea was______________. This key idea

helped me understand. Overall, I

learned_______________.

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Partner-Work

Exit Slip 11/1/16-Elements

1.) Which of the following is an element?

a. CO b. BF₃ c. HCl d.O₃

2.) Which of the following is NOT a molecule?

a. CO₂ b. Se c. HF d. NaCl

3.) T/F: Atoms are bigger than elements.

4.) T/F: Elements always have 1 capital letter.

5.) T/F: Elements contain 1 type of atom.