Simple Molecules

Why do scientists use models to portray molecules?

• Scientists have no other way to see molecules

• It is the only way they can provide proof for their work.

• It makes important aspects of the molecule easier to see.

• It is the only way they can figure out how to combine atoms

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What determines a molecule's atomic composition?

• The weight of the molecules and their properties

• The size of the molecule and its place on the periodic table.

• The types of elements and number of atoms in each element.

• The number of atoms in each element and the size of the molecule.

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What is the atomic difference between water (H₂O) and hydrogen peroxide (H₂O₂)?

• The only difference is that they have different structures

• Hydrogen peroxide has one more oxygen atom than water.

• The only difference is that they have different compositions.

• Atoms in water have stronger bonds than atoms in hydrogen peroxide.

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The term Chemical Structure is

• A count of the number of atoms in a molecule

• A list of all the elements that the molecule contains.

• The shape of the molecule that is built by bonding the atoms

• A way to tell where the molecule fits on the periodic table of elements

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If you were to describe the atomic composition of a molecule, you could say

• It has 3 Hydrogens and 2 Carbons

• It is in the shape of a pyramid

• It is cubic because of its many bonds

• It is cubic because of its many bonds It has a form like DNA

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How are scientists able to tell molecules apart?

• They use a special chemical solution

• They have to test the molecules in a lab.

• They are able to tell by the material molecules create.

• They identify molecules based on their unique composition and structure.

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NGSS.MS-PS1-1

What is the chemical formula for Carbon Dioxide?

• CA

• CO₂

• OC

• CD

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What is the chemical formula for caffeine (pictured)?

• C₄H₂N₁₀O₈

• CHN₂O

• CHNO

• C₈H₁₀N₄O₂

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Groups of atoms held together are called ____________ .

• Wu Tang Clan

• Bangtan Boys

• Molecules

• Mole Peeps

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NGSS.MS-PS1-1

Which of the following is a simple molecule?

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