Chemical Formulas and Models
Presentation
•
Science
•
6th - 8th Grade
•
Hard
Joseph Anderson
FREE Resource
5 Slides • 5 Questions
1
What is a Chemical Formula?
A chemical formula shows the types and numbers of atoms in a substance.
Example: H2O (water) gas 2 hydrogen atoms and 1 oxygen atom
2
Why do We Use Chemical Formulas?
They help scientists understand and communicate the composition of substances.
They are used to create and analyze materials in chemistry
3
What is a Ball-and-Stick Model?
a ball-and-stick model shows how atoms are bonded together in a molecule.
Balls represent atoms, and sticks represent bonds between them.
4
Reading a Ball and Stick Model
Identify the different colored balls representing different types of atoms
Notice how the sticks (bonds) connect the balls to show the molecule's structure.
5
Chemical Formulas vs. Ball-and-Stick Models
Chemical Formulas show the number of each type of atom
Ball-and-Stick models show how atoms are connected and arranged in space.
6
Multiple Choice
Is this a chemical formula or a ball and stick model?
chemical formula
ball and stick model
none of the above
7
Multiple Choice
What information does a chemical formula provide about a substance?
the color of the substance
the types and numbers of atoms
the weight of the substance
the texture of the substance
8
Draw
Draw a ball and stick model for H2O
9
Multiple Choice
Which of the following is true about the sticks in ball-and stick-models?
they represent different types of atoms
the represent bonds between atoms
they show the color of the atoms
they show the weight of the atoms
10
Open Ended
Name one difference between a chemical formula and a ball-and-stick model.
What is a Chemical Formula?
A chemical formula shows the types and numbers of atoms in a substance.
Example: H2O (water) gas 2 hydrogen atoms and 1 oxygen atom
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