Chemical Reactions and Balancing Equations

What does the Law of Conservation of Mass state about mass in a chemical reaction?

• Mass is created and destroyed

• Mass is neither created nor destroyed

• Mass is only created

• Mass is only destroyed

Tags

NGSS.MS-PS1-5

In a reaction A + B → C, if reactant A has 5g and product C has 9g, how many grams does reactant B have?

• 4g

• 5g

• 9g

• 14g

Tags

NGSS.MS-PS1-5

How much CO is in the converter if 16g of O₂ reacts to form 44g of CO₂?

• 16g

• 28g

• 44g

• 2g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How much water forms from 14.8g of hydrogen and 34.8g of oxygen?

• 49.6g

• 29.6g

• 19.6g

• 39.6g

Tags

NGSS.MS-PS1-5

How much chlorine is needed to complete the equation 2Na + Cl₂ → 2NaCl if 21g of Na is used?

• 4g

• 25g

• 21g

• 2g

Tags

NGSS.MS-PS1-5

What must be true for chemical equations according to the Law of Conservation of Mass?

• They must be unbalanced

• They must be balanced

• They must have more reactants

• They must have more products

Tags

NGSS.MS-PS1-5

What must you have on both sides of a chemical equation?

• Different number of atoms

• Same number of atoms

• More atoms on the left

• More atoms on the right

Tags

NGSS.MS-PS1-5

Is the equation Ag + O₂ → 2Ag₂O balanced or unbalanced?

• Balanced

• Unbalanced

• Cannot be determined

• Both

Tags

NGSS.MS-PS1-5

Is the equation S₈ + O₂ → 8SO₃ balanced or unbalanced?

• Balanced

• Unbalanced

• Cannot be determined

• Both

Tags

NGSS.MS-PS1-5

Is the equation 4P + 5O₂ → 2P₂O₅ balanced or unbalanced?

• Balanced

• Unbalanced

• Cannot be determined

• Both

Tags

NGSS.MS-PS1-5