Why does air have weight?

A. Because everything has weight

B. The force of gravity acts on the air molecules' mass

C. The pressure of the air molecules colliding with each other gives them weight

D. Air fills its entire volume, producing weight

Which is an example of flow of heat through conduction

Which elements are likely to have a larger atomic radius than silicon (Si). aluminum (Al) carbon (C) sulfur (S) tin (Sn)

Which of the following is a large-scale, slow-moving natural change? A) glaciation B) hurricane C) drought D) famine

Solutes usually dissolve best in cold solvents.

Earth rotates once every 24 hours. What does this mean? A. Earth makes one full trip around the Moon every 24 hours. B. Earth completes a full spin on its axis once every 24 hours. C. Earth makes one full trip around the Sun every 24 hours. D.

Which of the following equilibria would be impacted by a change in pressure? Select the correct answer below: H2 (g) + I2 (g) →2HI (g) NO (g) + O3 (g) →NO2 (g) + O2 (g) 2SO3 (g) →2SO2 (g) + O2 (g) CO (g) + H2O (g) →CO2 (g) + H2

A common stain remover is sold in concentrated form as 3M sodium hypochlorite (NaOCl). You need to create 400 milliliters of a 0.5M solution of sodium hypochlorite to fill a spray bottle. What volume of 3M sodium hypochlorite is needed? 15.0 mL 66.

A chemical reaction that takes in heat is called: exothermic endothermic a phase change

Which of the following lines (of latitude or longitude) would represent by 180 longitude? South Pole Equator Prime meridian North Pole International date line

63Ni decays by a first-order process via the emission of a beta particle. The 63Ni isotope has a half-life of 100. years. How long will it take for 65% of the nickel to undergo decay?