Unit 1 Review 2025

Pure substances include:

• Elements

• Homogeneous Mixtures

• Compounds

• Heterogeneous Mixtures

Oxygen

• Element

• Compound

Tags

NGSS.MS-PS1-1

Water

• Element

• Compound

Tags

NGSS.MS-PS1-1

Heterogeneous mixture

• A mixture with a composition that varies from point to point

• A mixture with a uniform composition and appears visually the same throughout

Homogeneous mixture

• A mixture with a composition that varies from point to point

• A mixture with a uniform composition and appears visually the same throughout

Air

• Homogeneous mixture

• Heterogeneous mixture

Chicken noodle soup

• Homogeneous mixture

• Heterogeneous mixture

Brass (an alloy)

• Heterogeneous

• Homogeneous

Oil and vinegar salad dressing

• Heterogeneous

• Homogeneous

The pH scale is a range from:

• 1-7
• 0-14
• 1-5
• 1-20