Mixture or Solutions

A mixture of three types of pasta would be easy to separate because all of the pastas--

• are less dense than water
• are solids
• have the same mass
• are attracted to a magnet

Why do you have to shake oil and vinegar salad dressing before you can use it?

• Vinegar and oil both contain water
• Vinegar and oil easily form a solution
• Vinegar and oil have different densities
• Vinegar and oil are both liquids

Theresa mixes a white powder into a beaker of water. The powder disappears. Why?

• solubility
• density
• conductivity
• mass

Definition: the ability to dissolve

• solution
• dissolve
• solute
• solubility

How can we separate salt grains from pepper grains?

• use a pair of tweezers
• run a magnet through the mixture
• put the mixture in water and filter out the pepper
• use a strainer with a fine wire screen

Which list contains only substances that dissolve?

• oil, sugar, pepper
• sugar, salt, koolaid mix
• sugar, oil, carrots
• butter, carrots, cooking oil

Which property of the material wrapping the jars are they trying to investigate in this table?

• state of matter
• ability to conduct electricity
• thermal energy production
• thermal energy insulation

Paul evaporated a solution containing 15 grams of salt in 75 mL of water. How much salt is left behind?

• 75
• 15
• 90
• 5

Is pepper soluble in water?

• Yes
• No

How do you know if a mixture is a solution?

• something in the mixture dissolved
• the physical properties don't change