In the reaction BaCl2 (aq) + Na S04 (aq) BaSO4 (s) + 2NaCl (aq), what phases are the reactants in before the reaction? A. Both reactants are gases.
B. BaCl, is a liquid, and Na, SO4 is a gas.
C. BaCl, is a solid, and Na, SO4 is in aqueous solution.
D. Both reactants are in aqueous solution.

List four observations that indicate that a chemical reaction may be taking place

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

How does blood clotting prevent the entry of pathogens through cuts and wounds? answer asap,, this is due tomorrow. will mark as brainliest or whatever you call it : )