Methane burns in the presence of oxygen to form carbon dioxide and water. 2nd attempt
A sealed chamber contains 7.50 g CH4 and 13.5g 02.
The mixture is ignited producing CO2 and H20. How many grams of CO2 are produced?

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange