PLEASE HELP ASAP! WILL GIVE BRAINLIEST! PLEASE HELP!! Lightning is seen before its associated thunder is heard. This is because light waves travel faster in air than sound waves do. Through which material would sound waves move faster than light waves?

A. Liquid Water
B. Solid Bronze Metal
C. Oxygen Gas
D. Helium Gas

Select the correct answer. when carbon dioxide dissolves in water, it sometimes reacts with water to form carbonic acid as in this balanced equation: co2 + h2o → h2co3. if 495 milliliters of carbon dioxide at 25°c and 101.3 kilopascals reacts with excess water, what is the theoretical yield of carbonic acid? use the periodic table and the ideal gas resource a. 0.889 g b. 1.10g c. 1.27g d. 2.02g what's the answer! quick!

What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons? a) 6 b) 8 c) + 1 d) 12 e) 18

Stage in which a star’s outer layers have started to cool and grow outward?