What is the atomic number of a sodium atom that has 11protons and 12 neutrons.

What cannot be changed by turning 100 grams of ice into water? a. mass b. phase c. volume d. density

Write complete ionic and net ionic equations for, SrCO3 (s) + H2SO4 (aq) - > SrSO4 (s) + CO2 (g) + H2O (l)

A velocity vs time graph is a graph that shows the relationship between the velocity of an object over time___is plotted on the x-axis in seconds, and the___of the object is plotted on the y-axis in meters per second.

If N gains 3 electrons from other atoms, why is it written N^-3 (with a - 3) ?

What would happen if your experimental value of water was too low or too high?

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.

What dose the smooth ER do

How many valence electrons are in each atom?