Mixtures Review

Which tools are best for separating a mixtures of sand, iron filings, and water?

• Hot plate and filter

• Tweezers and filter

• Filter and magnet

• Magnet and hot plate

Which substances, when mixed together, maintain their original physical properties?

• gravel and water

• wood chips, water and sand

• sand and water

• all of the above

In a container, a white solid is mixed with a clear liquid, and the following observations are recorded.

•Most of the solid dissolved in the liquid.

•The temperature of the solution decreased.

•The volume of the substance increased.

•Some of the solid remained at the bottom.

Which of the following observations SUPPORT the conclusion that a new substance was formed?

• Some of the solid remained at the bottom.

• The volume of the substance increased.

• The temperature of the solution decreased.

• Most of the solid dissolved in the liquid.

Tags

NGSS.MS-PS1-2

A student makes a garden salad by stirring lettuce, tomatoes, carrots, and croutons together in a bowl. Why is the garden salad a mixture?

• the student cut the vegetables into equally sized pieces

• the vegetables are combined by maintain their physical properties

• the croutons cannot be taken out of the salad

• the salad grew from a garden

The mixture shown here -

• Maintains its physical properties when combined

• Dissolves after being stirred together

• Will evaporate after a certain period of time

• Cannot be separated into ingredients

47 grams of salt is dissolved in 700 mL of water.  How much salt will remain after the water is evaporated?

• 653 grams
• 47 grams
• none
• 37 grams

Make different without changing what the material is made of, such as cutting, folding, or melting.

• physical change
• mixture
• solution
• mass

Tags

NGSS.MS-PS1-4

In which of the following mixtures is there evidence that a new substance was formed?

• A clear liquid is mixed with a yellow powder, and the powder dissolves completely.

• Blue crystals are mixed into a clear liquid, and the volume of the solution increased.

• A clear liquid is mixed with a yellow liquid, and heat energy is released.

• A salt water solution is boiled, and salt crystals can be seen on the bottom of the container.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical reaction is indicated in all of the following situations EXCEPT–

• gas bubbles form when baking soda is added to vinegar.

• a clear liquid becomes solid when heat energy is removed.

• the temperature of a solution decreases when a powder is added.

• a yellow solid forms when two clear liquids are mixed together.

Tags

NGSS.MS-PS1-2

Students collected data on four substances. If the same students were then given a mystery substance made of tan crystals that dissolves in water, it could be –

• Corn starch
• brown sugar
• white sand
• sand

Tags

NGSS.MS-PS1-2