Element, Compound, Mixture

A pure substance containing only one type of atom is called...

• A compound

• An element

• A heterogeneous mixture

• A homogeneous mixture

Which of the following does not describe elements?

• All subatomic particles are alike

• Can be broken down into simpler substances

• Have unique sets of properties

• Join together to form compounds

A pure substance where two or more elements are chemically combined is called...

• an element

• a compound

• a mixture

• a solution

Which of the following is an example of of a container filled with a pure substance rather than with a mixture?

• A balloon filled with helium.

• A jar filled with salt water.

• A tire filled with air.

• A glass filled with chocolate milk.

Which changes MUST happen for elements to become a compound?

• elements are heated

• chemical bonds form between atoms

• elements dissolve in water

• a gas becomes a liquid

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an example of the formation of a mixture?

• Rust forming on an iron nail.

• Sugar crystals dissolving in water.

• Sodium and chlorine forming table salt.

• Hydrogen and oxygen reacting to produce oxygen.

Which of the following lists only elements?

• H₂O + OH, MgCl_2, H₂

• H₂O, KF, MgCl₂

• KCl, Ag, Au

• K, Cl₂, N₂

Which of the following lists only compounds?

• H₂O + OH, MgCl_2, H₂

• H₂O, KF, MgCl₂

• KCl, Ag, Au

• K, Cl, N

Tags

NGSS.MS-PS1-1

Water (H₂O), is not found on the periodic table because water is a...

• atom

• liquid

• mixture

• compound

Tags

NGSS.MS-PS1-1

Oxygen and iron combine chemically to form rust. Rust (Fe₂O₃) is classified as which of the following?

• an atom.

• an element.

• a compound.

• a mixture.

Tags

NGSS.MS-PS1-1