Physical vs. Chemical

Juan observes these properties of an unknown substance. The substance is white, has a crystaline structure, dissolves in water and burns when a flame is applied. What is a chemical property of the substance?

• color
• crystaline structure
• dissolves
• burns

The ability of salt to dissolve into water is what type of property?

• Physical

• Chemical

When water is heated to 212° F, it begins to boil. This is an example of a

• Physical Property

• Chemical Property

Gasoline is flammable, meaning it has the ability to catch fire. This is an example of a

• Physical Property

• Chemical Property

Sodium reacts with water and causes it to burn. This is an example of a

• Physical Property

• Chemical Property

Changing the density of cheese by melting it

• Physical
• Chemical

Photosynthesis is an example of a

• physical change
• chemical change

One cup of water is left outside for two days when it was checked there was only half a cup left. What happened?

• evaporation; chemical change
• condensation; physical change 
• evaporation; physical change
• condensation; chemical change

Is mold growing on cheese a physical or chemical change?

• Physical 
• Chemical

Is copper tarnishing a physical or chemical change?

• Physical 
• Chemical