4-4-25: 6th Grade CDB Review

What are two the two types of mixtures?

• elements

• compounds

• heterogenous

• homogenous

During a science class, Olivia, Nora, and David are discussing the structure of different states of matter. Which of the following best describes the structure of a solid?

• Atoms are closely packed in a fixed position.

• Atoms are loosely packed and can move past each other.

• Atoms are far apart and move freely.

• Atoms are ionized and move independently.

Answer explanation

Atoms are closely packed in a fixed position.

Tags

DOK Level 2: Skill/Concept

TEKS.SCI.6.6A

Avery and Zoe are having a debate in science class. Avery says that homogeneous mixtures have a uniform composition, while Zoe argues that heterogeneous mixtures do not. What is the main difference between homogeneous and heterogeneous mixtures?

• Homogeneous mixtures have uniform composition; heterogeneous mixtures do not.

• Homogeneous mixtures are always liquids; heterogeneous mixtures are always solids.

• Homogeneous mixtures can be separated by physical means; heterogeneous mixtures cannot.

• Homogeneous mixtures are pure substances; heterogeneous mixtures are not.

Answer explanation

Homogeneous mixtures have uniform composition; heterogeneous mixtures do not.

Tags

DOK Level 2: Skill/Concept

TEKS.SCI.6.6B

Imagine you're in a science lab with Anika, Sophia, and Daniel. Which of the following best describes the kinetic energy of molecules in a gas?

• Molecules have very low kinetic energy and vibrate in place.

• Molecules have moderate kinetic energy and slide past each other.

• Molecules have high kinetic energy and move freely in all directions.

• Molecules have no kinetic energy and are stationary.

Answer explanation

Molecules have high kinetic energy and move freely in all directions.

Tags

DOK Level 2: Skill/Concept

TEKS.SCI.6.6A

During a science experiment, Anika, Abigail, and Nora observed different states of matter in a glass of water. Which of the following best describes the structure of a liquid?

• Atoms are closely packed in a fixed position.

• Atoms are loosely packed and can move past each other.

• Atoms are far apart and move freely.

• Atoms are ionized and move independently.

Answer explanation

Atoms are loosely packed and can move past each other.

Tags

DOK Level 2: Skill/Concept

TEKS.SCI.6.6A

Luna, Elijah, and Rohan are having a science discussion in their classroom. Can you help them figure out which of the following is an example of a heterogeneous mixture?

• Air

• Vinegar

• Salad

• Saltwater

Answer explanation

Salad is an example of a heterogeneous mixture because it contains different visible components like lettuce, tomatoes, and dressing that do not fully mix together.

Tags

DOK Level 2: Skill/Concept

TEKS.SCI.6.6B

Match the following terms with their definitions.

• A substance that cannot be broken down into simpler substances by chemical means.

• atom

• The basic unit of a chemical element.

• mixture 

• Combination of two or more pure substances that are not chemically combined

• element

• A substance formed when two or more chemical elements are chemically bonded together.

• compound          

Tags

NGSS.MS-PS1-1

Italian Salad Dressing is a (a)  

• heterogeneous mixture
• homogeneous mixture
• Pure Substance
• Compound

Salt is a (a)  

• element
• compound
• mixture

Tags

NGSS.MS-PS1-1

In a density column, the substance with the highest density is on the (a)   .

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