Mixtures & Solutions

Mary knocked over a candle and the wax hardened on the table. How can clean up the wax?

• use a magnet

• use tweezers

• use cold water

• use hot water

How would you separate a mixture of sand and salt? 

• Mix them with water and let the water evaporate
• Mix them with water, pour the mixture through a sieve, then let the water evaporate
• Heat the sand and salt mixture for 5 minutes, then let it cool
• I would not do any of these because none of these options would work

Tags

NGSS.3-5-ETS1-2

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

You know that a substance has dissolved when it-

• becomes a solid
• produces condensation and has water droplets 
• spreads evenly throughout a liquid

Tags

NGSS.MS-PS1-2

Rey is making soup. He will dissolve cubes of instant soup mix in hot water.
How can Rey make the soup cubes dissolve more quickly in the water? 

• use less water
• use more water
• add ice cubes to cool the water
• break the soup cubes into smaller pieces

Tags

NGSS.HS-PS1-5

Ernesto and Amanda fill two cups with water. They use hot water in one cup and cold water in the other cup. Next, they will stir a spoon of salt into each cup.     

In which cup will the salt dissolve more slowly? 

• The salt will not dissolve in either cup
• The salt dissolves more slowly in the hot water
• The salt dissolves more slowly in the cold water
• The salt dissolves at the same speed in both cups

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Hana put the same amount of salt into these two beakers of water. She stirred them into the same amount of water.
 
In which beaker does the salt dissolve more quickly? 

• Beaker A because the temperature is lower
• Beaker B because the temperature is higher
• The salt dissolves at the same speed in both beakers
• The salt does not dissolve in either beaker. It sinks to the bottom

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following would affect the rate of dissolving?

• Heating

• stirring

• particle size

• all of the answers

How would you separate the ingredients of mixture Z?

• Water
• A magnet
• A sieve
• My hands

Tags

NGSS.3-PS2-4

Mark was conducting an experiment to see how fast salt can dissolve in water.

The first beaker dissolved the salt in 1.3 minutes

The second beaker dissolved the salt in 0.2 minutes

The third beaker dissolved the salt in 2.5 mins

The forth beaker dissolved the salt in 6.3 mins

Which beaker shows that Mark used both heat and stirring to dissolve the salt?

• Beaker 1

• Beaker 2

• Beaker 3

• Beaker 4