Chem Review

Density: Chemical or Physical Property

• Chemical Property
• Physical Property

which one is the definition of chemical property?

• a property or characteristic of a substance that is observed during a reaction where the chemical composition of a substance is changed
• any change that results in the formation of new chemical substances
• combustibility

Is milk going sour a physical or chemical change?

• Physical 
• Chemical

Is sharpening a pencil a physical or chemical change?

• Physical 
• Chemical

How many protons does Oxygen, O, have?

• 8

• 5

• 14

• 2

What is the name of this element?

• Hydrogen

• Helium

• Lithium

• Beryllium

How many protons are in this element?

• 12

• 8

• 7

• 6

How many electrons are in this element?

• 39

• 19

• 20

• 21

How many neutrons are in this element?

• 39

• 19

• 20

• 40

Which element does this model represent?

• Nitrogen

• Hydrogen

• Carbon

• Boron