Chapter 7 Section 1 Objectives • Distinguish between heterogeneous mixtures and homogeneous mixtures. • Compare the properties of suspensions, colloids, and solutions. • Give examples of solutions that contain solids or gases. Heterogeneous Mixtures • The amount of each substance in different samples of a heterogeneous mixture varies. • • Example: Any two shovelfuls of dirt from a garden would not be exactly the same. A suspension is a ______________________________________________ _____________________________________________________________. • Example: natural orange juice, which contains particles of pulp. • Particles in a suspension may ____________ over time, and may be ___________________________________. • Some combinations of liquids _________________________, but will separate spontaneously. • Example: Oil and vinegar in salad dressing separates into two layers. • Liquids that do not mix with each other are _____________________. • One way to separate two immiscible liquids is to carefully pour the less dense liquid off the top. This is called ______________________-. • A colloid is _______________________________________________ that are __________________________________ between those in solutions and those in suspensions and ______________________________ in a liquid, solid or gas. • Particles in a colloid are _____________________________ out. • However, particles in a colloid are large enough to ____________________ that passes through: this is called the _________________________. • Examples of familiar materials that are colloids include gelatin desserts, egg whites, and blood plasma. • Some immiscible liquids __________ form colloids. • An emulsion is any ________________________________________________ in which one liquid is _______________________________ in the other. Homogeneous Mixtures • Homogeneous mixtures not only ___________________, but ________ uniform. • • Example: salt water, which looks uniform even when you examine it under a microscope A solution is a ____________________________________________________ ________________________________________________________________. • In a solution, the solute is the substance that ______________________ ___________________________________. • The solvent is the substance in which ___________________________. • Miscible liquids mix to form ________________________. • One way to separate miscible liquids is by distillation, which works when ______ _______________________________________________________________. • Water is a common solvent, but ____________ liquid solutions contain no water. • • • Example: Fuels such as gasoline, diesel fuel, and kerosene are made from a liquid solution called petroleum, also called crude oil. • Components of crude oil are separated by ________________________. Other states of matter can also form solutions. • The air you breathe _________________________________ of nitrogen, oxygen, argon, and other gases. • The liquid element mercury dissolves in solid silver to form a solution called an __________________, which can be used to fill cavities in teeth. An alloy is a _____________________________________________________ _________________________________________________.