2.1 Dissolving

Oliver is trying to understand what a solution is in his chemistry class.

• A single pure substance

• A mixture of two or more substances

• Only a liquid

• Always colorless

In a science experiment, Emma mixed sugar with water. In this sugar-water solution, which is the solvent?

• Sugar

• Water

• Both sugar and water

• Neither sugar nor water

What happens to sugar particles when Elijah adds them to his glass of water?

• They disappear completely

• They become larger

• They spread out among the water particles

• They turn into water particles

In a chemistry class, Samuel asked, "Which of the following is TRUE about all solutions?"

• They are always colorless

• They are always liquids

• They are always transparent

• They are always opaque

Isla is trying to understand the difference between melting and dissolving. Can you help her?

• Melting involves heat, dissolving doesn't

• Melting needs one substance, dissolving needs two

• Melting is faster than dissolving

• There is no difference

Nora is conducting an experiment where she dissolves salt in water. What happens to the mass when the salt dissolves in the water?

• The mass increases

• The mass decreases

• The mass stays the same

• It depends on the type of solute and solvent

In a science class, Aria is learning about solutions. Which of these is NOT a characteristic of a solution?

• It's a mixture

• It's always opaque

• It can be colored

• It's transparent

During a science experiment, Michael is trying to dissolve sugar in water. What helps separate the sugar particles?

• Heat

• Light

• Movement of solvent particles

• Gravity

Zoe is conducting an experiment in her chemistry class. She adds a substance to water and notices that it disappears. What do we call the substance that dissolves in a solvent?

• Solution

• Solute

• Solvent

• Mixture

In a science class, Daniel observed different types of solutions. Which statement about solutions is FALSE?

• They can be colored

• You can always see the solute particles

• They are transparent

• They are mixtures