AP Elemental Composition of Pure Substances

Which material is a pure substance?

• alloy

• compound

• mixture

• solution

When two or more substances combine, but each keeps its own properties, the new combination is called a(an)

• Element

• Mixture

• Compound

• Homogeneous substance

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 electrically stable compounds.

Tags

NGSS.MS-PS1-1

Given the chemical formula, how is this substance MOST LIKELY classified?

• atom

• compound

• both atom and compound

• neither atom nor compound

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NGSS.MS-PS1-1

These may all be classified as

• elements and compounds.

• elements and molecules.

• elements and pure substances.

• compounds and pure substances.

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NGSS.MS-PS1-1

The chemical formula of glucose is C6H12O6, so it is classified as a(n) .

• element

• mixture

• solution

• pure substance

Tags

NGSS.MS-PS1-1

One difference between mixtures and pure substances is that

• mixtures can be physically separated.

• mixtures are made of one type of atom.

• pure substances have no chemical bonds.

• pure substances can be physically separated.

In the classification of matter chart, letter A. would be a(n)

• acid.

• compound.

• element.

• solution.

"What is salt composed of?" Maria wondered. She took a microscope from the cabinet in her science classroom, put some salt on a microscope slide, and focused on the salt. She saw tiny squares on the slide. "I guess salt is made only of crystals:" Maria observed.

Is Maria correct in her conclusion?

• Yes. Salt is composed of crystals.

• No. Salt, like all matter is composed of atoms.

• No. Salt like all matter is composed of compounds.

• No. Salt, like all matter is composed of molecules.

Tags

NGSS.MS-PS1-1

Taylor was thirsty and decided to mix up a pitcher of lemonade. She put lemon juice, water, and sugar into a pitcher and stirred it to create this wonderful new drink. How could Taylor decide if she just created a mixture or a compound?

• it must be a compound because it all looks the same

• if it were a compound, there would have been an explosion

• it must be a mixture as she can separate all of the individual ingredients

• it must be a compound as she can separate all of the individual ingredients