What does dissolving look like?

• Stir a solid into a liquid and it disappears

• A solid floats

• A solid sinks

• A chemical reaction

Soluble means...

• It cannot dissolve!

• It can dissolve!

• We can solve it!

Salt and sugar can both dissolve in water. What makes it possible for them to dissolve?

• the crystals are very small

• the molecules attract to water molecules

• anything can dissolve if you keep stirring

These molecules have a high attraction, so...

• They will dissolve in each other

• They cannot dissolve in each other

• It will be hard to stir them

Tags

NGSS.MS-PS1-2

Crayon wax cannot dissolve in water. What is true about the wax molecules?

• They are much too large to dissolve

• They attract to water

• They do NOT attract to water

True or False? An atom is SMALLER than a molecule.

• True

• False

Tags

NGSS.MS-PS1-1

When sugar dissolves into water, it disappears. Are the sugar molecules still there?

• No - the sugar molecules broke down into single atoms in the water

• No - the sugar molecules were destroyed and the water took their properties

• Yes - the sugar molecules are mixed evenly with the water molecules

• Yes - the sugar molecules reacted with the water molecules to make something new

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

You mix 1 pound of sugar into 4 pounds of water. You stir until all the sugar dissolves. How much does the mixture weigh?

• 1 pound

• 3 pounds

• 4 pounds

• 5 pounds

Tags

NGSS.MS-PS1-5

Which of the following is NOT made of atoms?

• Molecules

• Energy

• Air

• Living things

Tags

NGSS.MS-PS1-1

Look at the picture. How many atoms do you see?

• 3 atoms

• 6 atoms

Tags

NGSS.MS-PS1-1