Which of the following statements about stars is true?

All stars are the same age.

Stars vary greatly in age.

none of these

Stars rarely differ in age.

A 7.36 g sample of copper is contaminated with a additional 0.51 g sample of zinc. suppose an atomic mass measurement was performed on this sample. What would be the measured atomic mass? 64.46 63.67 63.94 65.38

What is a common property of metals? a) insulates from electricity b) conducts electricity c) has very little reactivity d) is liquid at room temperature

Why the solids particles cannot diffuse but gas particle can diffuse

How is personification used to show grendels joy upon arriving at herot?

What is the name of the state when electrons absorb energy and move to a higher energy level

The density of a metal is 9.80 g/mL. What is the mass of a sample of metal when dropped in 28.9 mL of water, the volume increases to 56.4 mL?

Does sound travel best through solids, liquids, or gases?

Which term refers to the number of molecules or atoms that participate as reactants in an elementary step in a chemical reaction? molecularity particulates reactants submolecular

Due to food scarcity in ancient times people had to spend

A group of the same species makes up a?