Pure Substances and Mixtures

Identify which images are PURE SUBSTANCES! (Check all that apply) : )

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Solutions are ___________ mixtures.

• Solid

• Homogenous

• Heterogeneous

• Gas

How you would separate a saltwater solution which the water is collected?

• Filtration – using filter paper

• Distillation – vapor is collected

• Evaporation – solution is boiled and remains are collected

• Sieve – sifting (through a strainer)

• Magnetism – separating using a magnet

Which of the following is a method of separating solutions?

• hand separation

• filtering

• decanting

• evaporation 

How would you separate a mixture of water, sand, and salt?

• Mix them with water and let the water evaporate

• Pour the mixture through a sieve, then evaporate the water, leaving the salt behind.

• Heat the sand and salt mixture for 5 minutes, then let it cool

• I would not do any of these because none of these options would work

A ______________ mixture is one that does not have a uniform composition.

• heterogeneous

• homogenous

• pure substance

In a SOLUTION, the ___________ is the substance to be dissolved.

• Solubility

• Solvent

• Solute

• Solution

• Suspension

Which one of the following techniques would best be used to separate soil and water?

• Decanting

• distillation

• Filtration

• Chromatography

Which method can you use to separate sand and iron filings?

• Distillation

• Magnetism

• Filtration

• Evaporation

Two substances physically combined and that appears the same throughout is classified as

• homogeneous mixture

• heterogeneous mixture

• An element

•   A compound