Mixtures

Harold pours a bag full of coins into a machine that sorts coins. Three plastic tokens too thick to be U.S. coins are rejected. The rest of the objects are fed through trays with openings that would allow a quarter through, then one that would allow a nickel through, then a penny, and finally a dime. Any object left after the dimes are removed is rejected, and two tiny fake coins are rejected. The coins left in each tray are then counted, and the machine reads out the amount of money originally in Harold's bag. Which of the coins' properties did this machine use to sort them?

• color

• weight

• relative size

• magnetic properties

How do you create a mixture?

• melting an ice cube

• using a blow dryer for heat

• combining several substances

• pouring milk in a cup

What tool can be used to separate plastic beads and metal paper clips?

• filter

• magnet

• strainer

• thermometer

How do you separate iron filings from sand?

• You can use a filter.
• You can boil them.

• You can use a magnet.
• You can use centrifugation.

Which mixture would be most easily separated with a strainer?

• salt and sugar

• gravel and sand

• dimes and pennies

• iron filings and salt

In the image shown, which property is being used to separate the objects?

• magnetism

• shape

• size

• texture

Tags

NGSS.3-PS2-3

Ciara has a mixture of salt, cinnamon, and water. What will happen if Ciara stirs the mixture and then pours this mixture through a coffee filter?

• The water, salt, and cinnamon will all pass through the coffee filter.

• The water will pass through the coffee filter, leaving the salt and cinnamon behind.

• The water and salt will pass through the coffee filter, leaving the cinnamon behind.

• The water and cinnamon will pass through the coffee filter, leaving the salt behind.

Tags

NGSS.MS-PS1-2

What can slow down the rate of dissolving?

• crushing

• stirring

• heating

• cooling

When we want the solute to dissolve more quickly we should … the solution.

• stir

• saturate

• dissolve

• solve

Lonnie stirred some sugar into a pitcher of lemonade.

   
What happened to the sugar? 

• The sugar floated to the top surface
• The sugar disappeared after it was stirred.
• The sugar dissolved in the lemonade
• The sugar all settled to the bottom of the pitcher

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4