How many H2 and O2 molecules do you need to make exactly 4 water molecules with no leftovers?

Which of the following describes the entropy change as a solution is made from a liquid and solid

Bridget is in science class. her teacher gives her two unknown substances and asks her to determine their relative ph. she places a piece of red litmus paper into both substances. the litmus paper turns purple when she places it into substance i. the litmus paper turns blue when she places it into substance ii. a. substance i is a neutral substance and substance ii is an acid. b. substance i is a neutral substance and substance ii is a base. c. substance i is an acid and substance ii is a base. d. substance i is a base and substance ii is a neutral substance.

What is an effect of gravity on objects on the surface of earth? check all that apply. objects “fall” toward the center of earth. objects are pulled by earth but do not pull on earth. objects accelerate at a rate of 9.8 m/s each second. objects travel at a rate of 9.8 m/s toward the center of earth. objects are pulled by earth more strongly than they pull on earth.