The number of galaxies in the universe

A liquid extracted from petroleum contains 92.3% carbon, the rest being hydrogen. Its molar mass is around 80 g/mol. Determine the empirical formula and molecular formula of the liquid.

Show a correct numerical setup for calculating the average atomic mass of sulfur

Anions are those elements on the upper right side of the periodic table, excluding the Noble gases, that gain electrons when they ionize. T or F?

Complete double replacement for Na2CO3 + AIN

A population expert makes a graph to show the future rates of population growth in various countries. Which is necessary a source of error for him?

Explain why a balloon filled with O2 at room temperature collapses when cooled in liquid nitrogen where as balloon filled with He does not

Which mixture can be separated by using the equipment shown below?

El agua de Mar es una mezcla homogenea o disolucion Y El agua corriente Y El aire Y LA lejia Y Los refrescos con gas Y El suero fisiologico Y Las monedas Y LA leche Y LA gelatina Y Los productos de higiene Y El merengue

The component which dissolves in a solution is called the ...

If this fossil is 65 million years old, what could this fossil suggest about organisms alive today? A. If it is similar to any two modern species, it could be a common ancestor of these species. B.