Grade 9 Chem Review

If you change a substance into a new substance...

• Partial Change
• Physical Change
• Chemical Change
• Freezing

Substance with atoms that are all alike.

• element
• compound
• homogeneous mixture
• heterogeneous mixture

What type of mixture is this?

• homogenous mixture
• chemical
• heterogeneous mixture 
• solid mix

What is the definition of a compound?

• The smallest part of any substance which can exist on its own
• Two or more atoms chemically joined together (can be the same or can be different)
• A simple substance in which all the atoms are identical
• Two or more different elements chemically joined together

What's a valence electron?

• electrons in the second energy level
• electrons in the outermost energy level
• the atomic number
• electrons in the first level

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

The atomic number of potassium is 19. Therefore, the Potassium atom has:

• 19 protons, 39 neutrons, 19 electrons
• 39 protons, 19 neutrons, 26 electrons
• 19 protons, 20 neutrons, 19 electrons

_______ and _______ are located inside of the nucleus.

• Electrons and Protons
• Protons and Neutrons
• Neutrons and Electrons
• Protons and nucleotons

What is the atomic number for an element with twelve protons?

• 2
• 12
• 24
• 6

How many protons are in this element?

• 79
• 196
• 117
• Cannot be determined