Chemical Change and Law of Con of Mass SP.8.9.2 AND SP.8.9.3

Blue Color

• Physical Property
• Chemical Property

Density

• Physical Property
• Chemical Property

Flammability (burns)

• Physical Property
• Chemical Property

A student removes a loaf of bread hot from the oven. The student cuts a slice off the loaf and spreads butter on it. 

• Physical Change
• Chemical Change

In baking biscuits and other quick breads, the baking powder reacts to release carbon dioxide bubbles. The carbon dioxide bubbles cause the dough to rise. 

• Physical Change
• Chemical Change

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

How many Calcium atoms are in this compound? 
Ca (OH)₂

• 2
• 3
• 1
• 4

The coefficient in  3H₂O is

• 6
• 2
• 3
• 5

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction
• Mass is created in a physical change
• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
• Mass is never created or destroyed

How many nitrogen atoms does NH₃ have?

• 1
• 2
• 3
• 4