The density of copper is 9.0g/cm3 and the mass of a copper coin is 0.31g. Calculate the volume of the coin.

Which is the most accurate description of metals a. dull and brittle b. non reactive gases C. liquid at room temperature d. good conductors of electricity

Where are valence electrons located? in both the inner and outer electron shells in the outermost electron shell closest to the nucleus inside the nucleus

Complete the sentence indicating the number of protons and electrons in the given ion. Match the numbers in the left column to the appropriate blanks in the sentences on the right.

Given the reaction: Ca + 2H2O → Ca (OH) 2 + H2 What is the total number of moles of Ca needed to react completely with 4.0 moles of H2O?

What are the units of molar mass? O A. Lig O B. g/mol O c. g/L O D. mol/g

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.