Quiz 1 - Law of Conservation of Matter

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction
• Mass is created in a physical change
• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
• Mass is never created or destroyed

Which Chemical Equation is Balanced?

• CH₄+O₂------CO₂+2H₂O

• H₂+O₂-----2H₂O₄

• 4Al+3O₂-----2Al₂O₃

Which Chemical Equation is Balanced?

• Fe₄+O₂------4FeO₂+O₂

• 2H₂+O₂-----2H₂O

• 3Cr+4O₂-----2Cr₂O₃

Which Chemical Equation is Balanced?

• 4O₂ + 2H₂ + S₂------ 2H₂SO₄

• 4H₂+O₂-----2H₂O₂

• 3Cr+4O₂-----2Cr₂O₃

How many Sulfur atoms are present in the reactants of the following equation: 2SO₂ + 2H₂O₂ ----> 2H₂SO₄

• 2

• 3

• 4

• 8

How many Oxygen atoms are present in the product of the following equation: 2SO₂ + 2H₂O₂ ----> 2H₂SO₄

• 2

• 3

• 4

• 8

How many Hydrogen atoms are present in the product of the following equation: 2SO₂ + 2H₂O₂ ----> 2H₂SO₄

• 2

• 3

• 4

• 8

The number of atoms of  N (nitrogen) in 3 N₂O₅ is

• 2
• 5
• 6
• 15

Which are the reactants in the following reaction?
2Mg + O₂ ---> 2MgO 

• Mg and O
• MgO
• Mg and MgO
• O and MgO

What are the products of the chemical reaction pictured?

• CH₄ and CO₂
• CH₄ and O₂
• CO₂ and H₂O
• O₂ and H₂O