Elements, Compounds, and Molecules

Presentation

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Science

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8th Grade

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Practice Problem

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Medium

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NGSS

MS-PS1-1, MS-PS1-2

Standards-aligned

Jordan Archible

Used 2+ times

FREE Resource

17 Slides • 14 Questions

Elements, Compounds and Molecules

Made up of only one type of atoms.

e.g. Oxygen

Elements

Anything that has mass (weight) and takes up space

Matter

Vocabulary

The building blocks of matter

Atoms

Molecules

Made up of different atoms combined chemically

e.g. Water H₂O

What are atoms made of?

Atoms are made of Protons and Neutrons, located in the Nucleus, and Electrons around the outside of the nucleus.

Labelling

Please label the appropriate subatomic particles.

Drag labels to their correct position on the image

Electrons

Protons

Neutrons

Molecules & Compounds

What do aspirin, plastic wrap, and vinegar have in common? Give up? They are all compounds made from different combinations of the same three atoms: carbon, hydrogen, and oxygen. By themselves, these atoms cannot reduce pain, keep food fresh, or season food. But when they are chemically combined in certain ways to form compounds, they can be useful in many ways.

Compounds and Chemical Bonds

Most matter exists as compounds, not pure elements. That's because most pure elements are unstable. They quickly combine with other elements to make compounds. For example, water (H₂O) is a compound of hydrogen and oxygen.

What is a compound?

Compound - a substance whose smallest particle includes more than one element chemically bonded together.

For example, water (H₂O) is a compound of hydrogen and oxygen atoms bonded together.

What is a molecule?

Molecule - a group of atoms held together by covalent bonds

Compounds ARE molecules. The difference is that a compound is just a specific type of molecule, one that consists of MORE THAN ONE TYPE OF ELEMENT.

Pure Substance

This means that Compounds and Elements are Pure substances, but Mixtures are not.

Even though compounds are made up of more than 1 type of atom, they are pure substances because the atoms are bonded together.

Mixtures - contain more than 1 type of a substance, without a chemical bond between everything.

Directions:

Read each description and look carefully at the atoms represented by
colored circles.

If the atoms are touching each other, it represents a chemical bond.

Two or more of the same colored atoms bonded together represents a
single element.

Directions:

●Two or more different colored atoms bonded together represents a compound.

Directions:

●If the molecules of elements and compounds are not touching each other, they are not chemically bonded, and are a mixture.

Determine if each card represents

Elements, Compounds, or

Mixtures.

Multiple Choice