Chemical Solutions

During a lively science experiment, Aydeen and Pablo noticed bubbles forming in their test tube. What does this formation of gas indicate in their chemical reaction adventure?

• Physical change

• Chemical reaction

• No change

• Increase in volume

Answer explanation

The formation of a gas during a reaction indicates a chemical change, as it often results from new substances being formed. This distinguishes it from physical changes, where no new substances are created.

Tags

NGSS.MS-PS1-2

Jennifer is making lemonade. The sugar she adds to the water is the _____ that gets dissolved. 

• solute 

• solvent 

• solution 

• Sacajawea 

Answer explanation

The solute is the substance that gets dissolved in a solution. In this context, it refers to the component that is present in a lesser amount compared to the solvent, which is the substance that dissolves the solute.

Chloe and Jose are mixing a drink, and when one of the parts of the solution is water, we call it _________. 

• water stuff 

• water mixture 

• aqua-man

• aqueous 

Answer explanation

When a solution contains water as one of its components, it is referred to as 'aqueous'. This term specifically denotes that water is the solvent in the mixture, making 'aqueous' the correct choice.

Chloe is making lemonade and needs to know which part of the solution does the dissolving. 

• solute

• solvent 

• salt water 

• First Continental Congress 

Answer explanation

The solvent is the substance that does the dissolving in a solution. In the case of salt water, water acts as the solvent, while salt is the solute. Therefore, the correct answer is 'solvent'.

Jayden is making a cup of tea and notices that it is weak. This is an example of a _______.

• suspension

• solvent

• concentrated solution

• dilute solution

Answer explanation

Weak tea contains a small amount of tea leaves dissolved in a large volume of water, making it a dilute solution. This contrasts with concentrated solutions, which have a higher proportion of solute.

Martin and Elias are preparing a lemonade. A solution that is considered dilute would be ...

• dark in color

• have a strong scent

• have a large amount of solute

• have a small amount of solute

Answer explanation

A dilute solution contains a small amount of solute relative to the solvent. This means it is less concentrated, which is why it would not be dark in color or have a strong scent, as those characteristics are associated with more concentrated solutions.

Is a homogeneous mixture of a solvent and one or more solutes.

• True

• False

Tags

NGSS.MS-PS1-2

NaCl is an _______________________

• ionic compound

• molecular solute

• mixture

Tags

NGSS.MS-PS1-1

Are properties that affect solubility

• Temperature

• Pressure

• Density

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Are indicators that a chemical reaction has occured:

• color change

• gas production

• formation of a precipitate

• change in sound

• change in texture

Tags

NGSS.MS-PS1-2