Physical Science

The positively charged particle in the center of an atom is called the ___.

• proton
• electron
• neutron
• quark

The electron has a ___.

• negative charge
• neutral charge
• positive charge
• static charge

Where is most of the MASS of an atom located?

• In the nucleus

• Electron cloud

• In the electron

• Evenly spread throughout the atom

The atomic number of an element that has 6 protons and 8 neutrons is ___.

• 6
• 2
• 8
• 14

Fluorine is atomic number 9, and has a mass of 19. How many neutrons would it have?

• 9
• 6
• 19
• 10

How many Hydrogen (H) atoms are in NH₃O5

• 3
• 4
• 5
• 1

Name the part in red:

H₂ + O₂ -> H₂O

• Coefficient
• Product
• Reactant
• Subscript

Name the part in red:

H₂ + O₂ -> H₂O

• Coefficient
• Product
• Reactant
• Subscript

Is the following equation balanced or unbalanced ? 
N₂ +3 H₂ --> 2NH₃

• Balanced
• Unbalanced

Is the following equation balanced or unbalanced ? 
Al + O₂ --> Al₂O₃

• Balanced
• Unbalanced