Physical and Chemical Changes/Properties

Question 1

What is a Physical Change?

Answer 1

A change in a physical property of a substance, not altering chemical composition (like texture, shape, state of matter)

Examples include:

• Cutting
• Bending
• Mixing/Dissolving
• Freezing
• Melting

remember: physical changes can easily be reverted

Question 2

What are Physical Properties?

Answer 2

Properties that can be observed that do not alter the substance’s original chemical composition

Examples include:

• Density
• Color
• Melting/Boiling point
• Soluability
• Conductiveness
• Texture
• Odor

Question 3

What is a Chemical Change?

Answer 3

A change in a chemical property of a substance, altering chemical composition (like flammability, pH level, and reactivity)

Examples include:
* Burning
* Baking
* Formation of gases
* Color change

remember: chemical changes cannot be reverted, or just not easy to

Question 4

What are Chemical Properties?

Answer 4

Properties that can be observed through an alter of the substance’s original chemical composition

Examples include:

• Flammability
• Reactability
• pH level
• Corrosiveness
• Stability
• Oxidation
• Heat of Combustion

Question 5

Is burning a candle a physical or chemical change?

Answer 5

Chemical change - wax molecules change into different substances

Question 6

Is water evaporating a physical or chemical change?

Answer 6

Physical change - liquid changes into gas, but molecules remain the same

Question 7

Is iron oxidizing a physical or chemical change?

Answer 7

Chemical change - iron interacts with oxygen to form iron oxide

Question 8

Is dissolving sugar within water a physical or chemical change?

Answer 8

Physical change - particles spread out and form a solution, but do not combine nor change

Question 9

Is photosynthesis a physical or chemical process?

Answer 9

Chemical process - chloroplasts convert carbon and water into oxygen and glucose

Question 10

Is erosion a physical or chemical process?

Answer 10

Physical process - solid materials/molecules wear down, but do not change