Substances

What can all substances be classified as?

• a.pure substances or mixtures
• b.compounds or mixtures
• c.homogeneous or heterogeneous
• d.homogeneous or solutions

Which of the following is a pure substance?

• a.rain water
• b.tap water
• c.salt water
• d.distilled water

Which statement about elements is true?

• a.Elements can be chemically separated.
• b.Elements are made up of molecules.
• c.Elements are chemically made.
• d.Elements are pure substances.

Which substance has a definite composition?

• a.solution
• b.compound
• c.homogeneous mixture
• d.heterogeneous mixture

Which substance is a heterogeneous mixture?

• a.sugar
• b.iron
• c.soil
• d.aluminum

What is the classification of the substance in this model?

• a.solution
• b.pure substance
• c.element
• d.compound

Which substance is an example of a mixture?

• a.salt
• b.sandwich
• c.aluminum
• d.alum

Which substance forms when glitter, salt, and water are stirred together?

• a.compound
• b.element
• c.solution
• d.mixture

What are the smallest particles of elements?

• a.atoms
• b.molecules
• c.atoms or molecules
• d.atoms and molecules

What are the smallest particles of the substance in this model?

• a.atoms
• b.molecules
• c.atoms or molecules
• d.atoms and molecules