SCI 230 - MS-PS1-2: Mixtures and Solutions (NEW)

What is a mixture?

• A combination of two or more substances that are chemically combined

• A combination of two or more substances that are mixed together but not chemically combined

• A single substance that cannot be separated

• A chemical reaction between two substances

What happens to the ingredients of chicken soup if they are separated?

• They change into different substances

• They remain the same

• They become chemically combined

• They dissolve completely

How can sand and seashells be separated?

• By using a magnet

• By using a sifter

• By dissolving in water

• By heating them

What property of sand and seashells allows them to be separated?

• Color

• Size

• Weight

• Texture

What property of iron allows it to be separated from sand using a magnet?

• Iron is magnetic

• Iron is non-magnetic

• Iron dissolves in water

• Iron evaporates when heated

How can a mixture of salt and pepper be separated using water?

• By dissolving salt in water and filtering the mixture

• By using a magnet to attract the salt

• By heating the mixture to evaporate the pepper

• By freezing the mixture to solidify the salt

What happens to the salt when the salt and water mixture is heated?

• The water evaporates, leaving the salt behind

• The salt evaporates with the water

• The salt dissolves further

• The salt turns into pepper

Which of these pictures shows a mixture?

• 
• 
• 

Answer explanation

Trail mix and salad are mixtures. They are made of different materials that can have different properties and can be separated from one another. Pure gold is not a mixture. It is only made of one element.

Knowing the different ​ (a)   can help a person to separate the substances from one another. (b)   are magnetic and will be attracted to the magnet. (c)   is not magnetic and will not be attracted to the magnet.

• Iron filings
• Sand
• properties

Zach, a construction worker, is carrying a toolbox with metal nails, screws, and a number of small plastic pieces. Zach trips and spills everything in his toolbox. What would be the most effective way for Zach to separate the metal nails and screws from the other plastic pieces?

• use a large magnet to pick up the nails and screws

• pick up each nail and screw one at a time

• call his friend Jake, who is 30 blocks away, to help him

• There is no way to separate the nails and screws from the small plastic pieces.

Answer explanation

The nails, screws, and plastic pieces form a mixture, but the nails, screws, and plastic pieces maintain their own properties. One property of the nails and screws is that they are magnetic. The quickest, most effective way to remove the nails and screws is to use a large magnet that will pick up only the nails and screws, while leaving the plastic pieces on the ground.