Which term identifies a type of chemical

reaction?

(1) decomposition (3) sublimation

(2) distillation (4) vaporization

What does the the release or absorption of energy indicate? A. Physical Change B. Chemical Change C. Physical and chemical changes D. Neither physical nor chemical changes

If element X has 49 protons, how many electrons does it have? Your Answer:

Calculate the molar mass of aluminum nitride

What is the molarity of a hydrochloric acid solution prepared by diluting 200.0 ml of 0.500m hcl to a total volume of 1.00 l?

Un compus al unui metal M care contine 20 protoni in nucleu, contine alaturi de acesta oxigen si un alt nemetal Y ce are configuratia electronica K=2e, L=8e, M=6e.

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.