Valence electrons are: O a. Electrons that have been lost in an atom O b. Electrons in the nucleus of an atom O c. electrons in the outer-most shell of an atom O d. electrons in the inner-most shell of an atom

1. How does the amount of energy in the batteries in a flashlight compare to the total amount of energy given off by the flashlight as light and heat? 2. What are two ways the rate of a chemical reaction can be changed? 3.

Which compound contains a radical

Can calcium conduct electricity

Which material is a pure substance? A) alloy B) compound C) mixture D) solution

How would you describe the motion of the particles that make up a rock?

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.

A compound composed of electrically chargerd atoms is called?