Chemistry CFA #3

Who created the Law of Conservation of Mass?

• Henry Mosely

• Charles Darwin

• Antoine Lavoisier

• Dimitri Mendeleev

Balance this equation!!

• Al₂O₃ ---> 2Al + O₂

• 2Al₂O₃ ---> 4Al + O₂

• 2Al₂O₃ ---> 4Al + 3O₂

• 2Al₂O₃ ---> 4Al + 2O₂

What are the coefficients in this equation?

• 3, 4, 5

• 2, 3, 8

• 3, 8, 10

• 2, 3, 4, 5

What are the subscripts in this equation?

• 3, 4, 5

• 2, 3, 5, 8

• 2, 3, 8

• 3, 5, 8, 10

Which substance(s) is a compound in this equation? Choose all that apply.

• C₃H₈

• CO₂

• H₂O

• O₂

Which substances are elements in this equation? Choose all that apply.

C + 2H₂ ----> CH₄

• C

• H₂

• CH₄

What does the Law of Conservation of Mass state?

• Energy can not be created or destroyed, it changes form.

• Mass can not be created or destroyed, it changes form.

• All mass is created equal.

• Every action has an equal and opposite reaction.

What element is represented here?: P₂

• phosphorus

• platinum

• potassium

• promethium

What is the total number of atoms?: 4H₂CO₃

• 10

• 21

• 12

• 24

How many atoms of Sulfur?: 6H₂SO₄

• 4

• 1

• 5

• 6