Unit 2, Mixtures (5.P.8.3)

A beaker contains a mixture of sand and salt. Which of the following procedures will best separate this mixture?

• placing a magnet in the beaker

• heating the beaker on a hot plate

• . pouring the contents of the beaker through a filter

• adding warm water to the beaker and pouring through a filter

Mixtures of solids can be separated according to their properties, such as in the image shown below. Which of the following properties is being used to separate the objects in the image?

• magnetism

• shape

• size

• texture

Tags

NGSS.5-PS1-3

NGSS.3-PS2-3

The picture below shows a box that contains rubber cap erasers, steel screws and nuts, and corks that are made of tree bark. Jarid has been given the task of separating the screws and nuts from the cap erasers and corks. He can use any means to separate these materials, except he cannot use his hands directly to sort the materials. Which tool would be best to use to separate these materials?

• filter

• magnet

• Screwdriver

• Strainer

Tags

NGSS.3-5-ETS1-1

NGSS.3-5-ETS1-2

Jenna pours a bag full of change 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 Jenna's bag. Which of the coins' properties did this machine use to sort them?

• color

• weight

• relative size

• magnetic properties

Mr. Krouch's science class is learning about matter. The students receive a bag with objects and are asked to separate the objects based on any one physical property. The students separate the objects into three groups as shown below. Which physical property did the students use to separate the objects?

• color

• magnetism

• shape

• size

Tags

NGSS.5-PS1-3

Craig has a mixture of salt, pepper, and water. What will happen if Craig pours this mixture through a coffee filter?

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

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

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

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

Some makers of cereal add iron filings to their cereal products to increase the iron content. The flow chart below describes one method to separate the iron from the cereal. Which of the following choices would best describe the missing step in the flow chart?

• add dye to stick to the iron filings

• wait for an hour to let the iron filings sink

• boil the water to separate the iron filings out

• put a magnet into the water to attract the iron filings

Tags

NGSS.MS-PS1-2