8th Sci - Chemistry Unit Review

What is density? 

• Amount of mass in a container. 
• Amount of liquid in a container. 
• Amount of mass in a given volume. 

How do you determine if something floats in water?

• Greater than 1g/mL will sink, less than 1g/mL will float.
• Greater than 1g/mL will float, less than 1g/mL will sink.

Which two particles make up mass number?

• Protons and electrons
• Atomic number
  Protons and neutrons
• Electrons and neutrons
• Electrons and protons

What are valence electrons?

• Electrons that do not react with other atoms
• Electrons in the innermost ring
• Electrons in the outermost ring
• Electrons that die in chemical reactions

which particle never changes because it is the identity of the atom?

• Number of neutrons
• Number of electrons
• Number of protons
• Number of valence electrons

Elements that touch the zigzag line on the periodic table are classified as...?

• Metalloids
• Metalalls
• Non-metals
• Non-alkaline metals

Elements in the far upper right corner are classified as...?

• Metals
• Metalloids
• Nonmetalloids
• Nonmetals

We know that a substance is organic because it contains...?

• Hydrogen
• Carbon
• Potassium
• Sulfur

Element or compound?
NO₃

• Element
• Compound

Element or compound?
2CO

• Element
• Compound