Unit 2 Part B Review Quiz

When energy is added to a reaction, what happens to the molecules? 

• The system becomes more stable and more bonds form

• The system becomes less stable and less bonds form 

• The system becomes less stable and more bonds break

• The system becomes more stable and more bonds break 

Tags

NGSS.HS-PS1-4

For a chemical bond to form, what must happen...

• The attractive forces between the atoms must be greater than the repulsive forces

• The repulsive forces between the atoms must be greater than the attractive forces

• The attractive and repulsive forces between the atoms must be equal (balanced)

• It depends on the specific atoms involved since each element has a different number of protons, neutrons and electrons causing each atom to have unique electrostatic forces.

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NGSS.HS-PS1-3

During electrolysis of water, what is the reaction that takes place? 

• H2O is broken down into H2 gas and O2 gas

• H2 gas and O2 gas bond together to form H2O

• H+ atoms and O- atoms bond together to form H2O

• H2O is broken down into H+ and O-

Tags

NGSS.HS-PS1-4

The electrolysis of water is an...

• Endothermic physical reaction

• Exothermic physical reaction

• Endothermic chemical reaction

• Exothermic chemical reaction

Tags

NGSS.HS-PS1-4

Which gas made a popping sound following the electrolysis of water? 

• Oxygen

• Helium

• Hydrogen

• Water vapor

Tags

NGSS.MS-PS1-1

When a chemical bond forms which subatomic particle(s) is being shared?

• Electrons

• Protons

• Neutrons

• It depends on the atoms in the bond

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What role do additional atoms play in helping bonds form? 

• They transfer energy into the other atoms, increasing their energy, and bonds only form when it is high energy

• They transfer energy into the other atoms, decreasing their energy, and bonds only form when it is low energy

• They absorb energy from the other atoms, increasing their energy, and bonds only form when it is high energ

• They absorb energy from the other atoms, decreasing their energy, and bonds only form when it is low energy

Tags

NGSS.HS-PS1-4

What role do additional atoms play in helping bonds break?

• They transfer energy into the molecules, increasing their energy, and bonds only break when it is high energy

• They transfer energy into the molecules, decreasing their energy, and bonds only break when it is low energy

• They absorb energy from the molecules, increasing their energy, and bonds only break when it is high energy

• They absorb energy from the molecules, decreasing their energy, and bonds only break when it is low energy

Tags

NGSS.HS-PS1-4

When bonds break, what happens to motion of the separate atoms?

• The atoms slow down and kinetic energy increases

• The atoms speed up and kinetic energy increases

• The atoms slow down and kinetic energy decreases

• The atoms speed up and kinetic energy decreases

During gas filled balloon explosion, what is the reaction that takes place?

• H2O is broken down into H2 gas and O2 gas

• H2 gas and O2 gas bond together to form H2O

• H+ atoms and O- atoms bond together to form H2O

• H2O is broken down into H+ and O-

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-7