Unit 9 Review Quiz

Madison's lab group is given a dish that contains sand, shells, and water. How should theyclassify the substance they have been given?

• pure substance because it’s made up of various compounds

• homogeneous mixture because it has the same uniform appearance and composition throughout

• compound because it contains several elements

• heterogeneous mixture because it does not have the same uniform appearance or composition

Examine the models below.  

Which model represents a pure substance?

• Model 1, because it represents compounds

• Model 2, because it represents several elements

• Model 3, because it represents one type of compound.

• Model 4, because it contains both elements and compounds.

Tags

NGSS.MS-PS1-1

The graph below shows the composition of the air we breathe.

Which of the following statements correctly classifies the air we breathe?

• The air we breathe is an element.

• The air we breathe is a compound.

• The air we breathe is a homogeneous mixture.

• The air we breath is a heterogeneous mixture.

Soda water is formed by mixing carbon dioxide (CO2) with distilled water (H2O).Classify the two substances based on the information provided.

• Soda water and distilled water are both heterogeneous mixtures.

• Soda water is a homogeneous mixture and distilled water is a pure substance.

• Soda water is a pure substance while distilled water is a homogeneous mixture.

• Soda water and distilled water contain hydrogen and oxygen, therefore they are both pure substances.

Tags

NGSS.MS-PS1-1

Which of the following describes rice and beans combined in a bowl?

• compound

• pure substance

• homogeneous mixture

• heterogeneous mixture

Which of the following is formed when salt is dissolved in water?

• solution

• compound

• pure substances

• heterogeneous mixture

The table below shows various solutions and their pH.

Borax 9.2

Water 7.0

Soda 4.0

Lye 14.0

Which of the above substances is considered an acid?

• Lye

• Soda

• Borax

• Water

Use the image of the pH scale to answer the following question.

 

What would the outcome of a solution be, if Gastric Juice and Sodium Hydroxide (as shown in the pH scale above) are mixed in a beaker during a lab?

• a salt solution

• a more basic solution

• a neutral acid solution

• a more acidic solution

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The image below contains a list of common household cleaners and their pH levels.

The more basic a solution is the better it performs as a cleaning agent.Which of the following would make the best cleaning agent and why?

 

• Vinegar would be the best cleaner, because it has a pH of 3.

• Toilet Bowl Cleaner would be the best cleaner, because its pH is 1-3.

• Mild Dish Soap would be the best cleaner because it has a pH is closest to neutral.

• Tub & Tile Cleaner would be the best cleaner, because it has a pH of approximately 11-13.

Tags

NGSS.MS-PS1-2

Use the image below to answer the following question.

Based on the pH scale, which substance is more acidic than tomato juice?

• Lemon juice has a lower pH therefore it is more acidic than tomato juice.

• Baking soda has a lower pH therefore it is more acidic than tomato juice.

• Black coffee has a greater pH therefore it is more acidic than tomato juice.

• Milk has a pH closest to neutral therefore it is more acidic than tomato juice.