Conservation of Mass

KNO₃ --> KNO₂ + O₂
What coefficients are needed to balance the reaction?

• 2, 2, 1
• 2, 3, 2
• 1, 2, 2
• 1, 3, 1

Tags

NGSS.MS-PS1-5

Cu₂O + C --> Cu + CO₂
What coefficient goes in front of Cu?

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Ca + O₂ --> CaO
What coefficient goes in front of CaO?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-5

Is this equation balanced?

• yes
• no
• Not enough information

Tags

NGSS.MS-PS1-5

Is this equation balanced?

• yes
• no
• Not enough information

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Matter can not be created nor destroyed: it can only be

• Destroyed a little bit
• Invisible
• Transformed, changed
• None of the above

Tags

NGSS.MS-PS1-5

The number in this picture is the 

• Subscript
• Superscript
• Coefficient
• Period number

The number in front of a compound or element is a 

• Subscript
• Coefficient
• Superscript
• Charge

Which of these is not a chemical reaction?

• Burning of wood
• Milk going bad
• Mixing vinegar and baking soda
• Melting of ice

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which of these is NOT a chemical reaction?

• Two liquids mix to give a new color
• Two gases react to make a liquid
• A liquid and a solid mix to make a gas
• Melting an aluminum can 

Tags

NGSS.MS-PS1-2