Which of the following equations is correctly balanced? A. N2 + 3H2 ---> 2NH3

B. H2 + O2 ---> 2H2O

C. 2Ag + 2O ---> Ag2 + O2

D. N2+H2 ---> NH3

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth

State one important difference between a physical change and a chemical change?