Astudent observed a chemical reaction in which the mass of the products was measured to be less than the mass of the reactants. how can this be explained? a) the mass of the products is always less than the mass of the reactants in a chemical reaction b) some of the products must have escaped undetected c) the law of conversation of mass does not apply to chemical reactions d) some of the matter was converted into energy during the reaction

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

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?

Need ! asap will mark 10 pts using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers