Elements, Compounds, and Mixtures

Four liquids are shown here. ________________ is the only COMPOUND illustrated.

• Salt Water

• Orange Juice

• Milk

• Pure Water

Tags

NGSS.MS-PS1-1

The table lists the chemical formulas or symbols of a few common substances. Which two substances are compounds?

• aluminum and iron

• iron and sodium chloride

• carbon dioxide and aluminum

• sodium chloride and carbon dioxide

Tags

NGSS.MS-PS1-1

Water is formed when two hydrogen atoms bond to an oxygen atom.

When a substance is made of two or more atoms like this, we call it a _________

• mixture

• compound

• complex

• element

Tags

NGSS.MS-PS1-1

• Pure Aluminum foil
• distilled water
• NaCl (table salt)
• Gold Bar (pure Au)

All of these may be classified as:

• elements

• compounds

• pure substances

• mixtures

Ice cream in a bowl with whipped cream and sprinkles is BEST described as:

• mixture

• element

• compound

• substance

Which of these is not considered a pure substance?

• an atom

• a mixture

• an element

• a compound

An unknown substance is provided in a science class. Looking at the substance, a student observes different colors and different sizes of particles unevenly distributed throughout the substance. What type of matter BEST classifies this substance?

• Heterogeneous Mixture

• Homogeneous Mixture

• Element

• Compound

Summarize the Venn diagram.

• Compounds are found inside the matter of atoms.

• A pure substance may contain subatomic particles but not atoms.

• Compounds are the most basic form of matter. They combine to form larger atoms.

• Atoms are the most basic form of matter. They combine to form larger compounds.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Elaborate on whether this structure represents an element or a compound.

• This element is made up of multiple atoms.

• It is an allotrope representing chloric acid.

• The compound is made up of two different atoms: hydrogen and chlorine.

Tags

NGSS.MS-PS1-1

Elaborate the difference between NO and No.

• NO and No represent neither a compound, a molecule, nor an element. Both are not possible.

• NO represents the molecule nitrogen monoxide while No represents the molecule sodium oxide.

• NO is the molecule nitrogen monoxide while No is the atomic symbol for the element nobelium.

• NO and No both symbolize the molecule nitrogen monoxide - the capitalization doesn't matter.