Laws of Conservation in Reactions

In the 18th century, what substance was believed to be released from materials during burning?

• Phlogiston

• Oxygen

• Carbon Dioxide

• Hydrogen

Which fundamental law of chemistry states that matter can be changed but not destroyed during a chemical reaction?

• Law of Definite Proportions

• Law of Conservation of Energy

• Law of Conservation of Mass

• Law of Multiple Proportions

In what year did John Dalton publish his Atomic Theory, which was influenced by the laws of conservation of mass and definite proportions?

• 1789

• 1808

• 1869

• 1776

What are the correct coefficients to balance the chemical equation for the combustion of methane: CH4 + O2 → CO2 + H2O?

• 1, 1, 1, 1

• 1, 2, 1, 2

• 2, 1, 2, 1

• 1, 2, 2, 1