If calcium has two valence electrons and fluorine has seven, how many fluorine atoms are needed to form an ionic bond with calcium

Which will cause an increase in the reaction rate between molecules? Molecules have strong internal bonding. Molecules collide more frequently. Electrons in the bonds remain in a meta-stable state.

Describe the attractive forces and repulsive forces that exist between two atoms as the atoms move closer together

Which of the following statements is true of water in a solid state? Choose all that apply. A. There are covalent bonds between each water molecule. B. Solid water conforms to the shape of its container. C.

Why do magnesium and oxygen need to be heated for a reaction to occur?

What are the two sources of Earths internal heat energy today

A student has a solution with a pH of 7. The student adds HF, hydrogen floride, to the solution, hoping to increases the pH of the solution. What is wrong with this student's approach? Select one: A. You cannot change the pH of a solution. B.

What is more likely to happen if wetlands are drained?

A) If you weigh a hydrated compound before and after heating it. Do you expect the mass to be more or less than before heating? Explain why. b) How about if you weigh a bag of popcorn before and after heating it.

Define the term relative molecular mass

It took many of the metals several minutes to begin to react. Once the reaction was initiated, several of these metals continued to react quite vigorously.