LockeD! Mixtures and Solutions #2

A student has been given samples of five different substances: salt, sugar, gravel, wood chips, and iron filings. Which two substances, if mixed together in a glass of water, will the student be unable to separate easily from each other once the water has been evaporated?

• Salt and sugar

• Sugar and gravel

• Gravel and iron filings

• Iron filings and wood chips

Steel cans are separated from aluminum cans in a recycling center. Which of the following is the BEST way the recycling center can separate the steel cans from the aluminum cans?

• Sort the cans by size

• Put the cans in water

• Cool the cans to a low temperature

• Put the cans under an electromagnet

Cereals are made of many different ingredients. The diagram shows some of these ingredients. Which term BEST describes the cereal?

• compound

• elements

• mixture

• solution

Which of these is a mixture?

• Salt

• Water

• Lemonade

• Sugar

A student put some salt, sugar, and rocks in a cup of warm water and then shook the cup. If the mixture in the cup was poured through a filter, what would remain on the filter?

• The sugar

• The sugar and the salt

• The water

• The rocks and some water

Which physical property could be used to separate some corks from some rocks?

• The corks float in water

• The corks are magnetic

• The corks dissolve in water

• The rocks dissolve in water

Which of the following is an example of a mixture?

• Water

• Sugar

• Salad

• Salt

Which of the following mixtures cannot be separated easily by hand?

• Screws and nails

• Apples and oranges

• Nickels and dimes

• Salt and pepper

A mixture of pebbles and paper clips can be easily separated. Which physical property of the ingredients makes it easy to separate the mixture?

• Magnetism

• Color

• The ability to dissolve

• The ability to float

All of the following are physical properties of matter EXCEPT—

• magnetism

• its location in the room

• ability to conduct electricity

• ability to insulate heat