Physical/Chemical Properties and Changes

A student mixes yellow powder with water. Which observation would prove a CHEMICAL change occurred?

• The powder DISSOLVED in the water

• The water turned the COLOR yellow

• The bag's TEMPERATURE changed

• The STATE OF MATTER changed

Which of the following options provides evidence of a CHEMICAL change?

• Wood is burned releasing ash and smoke

• Rocks separate when soil is sifted

• Water turns to ice when you put it in the freezer

• Salt dissolves in water

Which of the following examples provides evidence of a PHYSICAL change?

• Wood is burned and releases ash and smoke

• Iron rusts over time

• When mixed, baking soda and vinegar form gas bubbles

• A piece of paper changes shape when you rip it up

Which observations prove a chemical change has occurred?

• Dissolving and expected color change

• Mixing and dissolving

• State of matter change and boiling water bubbles

• Unexpected color change and temperature change

Density: Chemical or Physical Property

• Chemical Property
• Physical Property

Physical properties are

• Properties that can be observed without changing the identity of the substance

• Properties that describe how a substance changes into a completely different substance

Which statement best describes chemical properties of matter?

• Chemical properties, such as density, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.

• Chemical properties, such as reactivity, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.

• Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.

• Chemical properties, such as boiling point, are generally observed as the identity of a substance changes and one or more new substances form.

What is a physical property of these strawberries?

• Red

• Rotten

• Flammable

What is a chemical property of paper?

• Flammable

• White

• Light

Chewing food to break it down into smaller particles represents a _________ change, but the changing of starch into sugars by enzymes in the digestive system represents a ___________change. 

• Chemical then Physical 
• Physical then Chemical
• Both Physical
• Both Chemical