Types of Mixtures
Two or more substances physically combined, not chemically bonded.
What is mixture?
Milk is commonly classified as what type of mixture in this lesson?
A colloid
What tool would you use to separate iron filings from sand?
A magnet
What is the substance that does the dissolving called?
The solvent
A solution containing relatively little solute is described as what?
Dilute
A salad has visibly different parts. What type of mixture is it?
A heterogeneous mixture
Muddy water is an example of what type of mixture?
A suspension
What method can separate sand from water?
Filtration
What is the substance that is dissolved called?
The solute
What term describes how much solute can dissolve in a solvent under given conditions?
Solubility
Saltwater looks the same throughout. What type of mixture is it?
A homogeneous mixture
Which type of mixture has particles that can settle out when left undisturbed?
A suspension
What method can recover dissolved salt from saltwater?
Evaporation
In saltwater, identify the solute and the solvent.
Salt is the solute; water is the solvent
A solution that cannot dissolve more solute under the same conditions.
What is a saturated solution?
What happens to the individual properties of substances when they form a mixture?
The substances keep their individual properties.
What happens when a beam of light passes through many colloids?
The particles scatter the light.
Why does filtration separate sand from water but not dissolved salt from saltwater?
Sand particles are large enough to be trapped by the filter; dissolved salt particles pass through with the water.
What happens to solute particles when a substance dissolves?
They separate and become surrounded/distributed among solvent particles.
For many solid solutes, what usually happens to solubility when the solvent temperature increases?
Solubility usually increases.
Compare a homogeneous mixture with a heterogeneous mixture.
A homogeneous mixture is uniform throughout; a heterogeneous mixture has unevenly distributed or distinguishable components.
An unknown cloudy mixture does not settle after several hours and scatters light. How should it be classified?
A colloid
You have iron filings, sand, and salt mixed together. Give a logical separation sequence.
Use a magnet to remove iron; add water to dissolve salt; filter out sand; evaporate the water to recover salt.
Why is a solution considered a homogeneous mixture?
Its components are evenly distributed, so the solution has the same overall composition throughout.
Explain the difference between concentration and solubility.
Concentration describes how much solute is actually present; solubility describes how much solute can dissolve under specific conditions.