2025 Chemistry Practice Final

A theory is a ___

• Proposed explanation for an observation

• Well-tested explanation for a broad set of observations

• Summary of the results of many observations

• Procedure used to test a proposed explanation

Which step in the scientific method requires you to use your senses to obtain information?

• Revising a hypothesis

• Designing an experiment

• Making an observation

• Stating a theory

All of the following are physical properties of matter except ___

• Mass

• Color

• Melting point

• Ability to rust

Which state of matter has a definite volume and takes the shape of its container?

• Solid

• Liquid

• Gas

• Both b and c

Which of the following is a physical change?

• Corrosion

• Explosion

• Evaporation

• Rotting of food

Tags

NGSS.MS-PS1-4

Which of the following is a homogeneous mixture?

• Salt water

• Beef stew

• Sand and water

• Soil

Which of the following is true about compounds?

• They can be physically separated into their component elements

• The have compositions that vary

• They are pure substances

• They have properties similar to those of the component elements

Which of the following is a chemical property?

• Color

• Hardness

• Freezing point

• Ability to react with oxygen

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NGSS.MS-PS1-5

The smallest particle of an element that retains the properties of that element is a(n) ___

• Atom

• Electron

• Proton

• Neutron

Dalton’s atomic theory included which idea?

• All atoms of the same element are the same size.

• Atoms of different elements always combine in one-to-one ratios.

• Atoms of the same element are always identical.

• Individual atoms can be seen with a microscope.

Tags

NGSS.MS-PS1-5