On a mission to a newly discovered planet, an astronaut finds gallium abundances of 61.29% for 69ga and 39.71% for 71ga . what is the atomic mass of gallium for this location?
the mass of 69ga is 68.7200amu . the mass of 71ga is 70.9200amu .

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.