Question | Answer |
There are ___ atoms in a mole of Mg. | 6.02 * 10^23 |
The simplest ratio of atoms among the elements represents the compound's ____ | Empirical formula. |
Give an example of a molecular formula for C3H6O | C6H12O2 |
When can ionic compounds, such as NaCl, conduct electricity? | When the ions are free to move, so when they are dissolved in water or melted. |
A compound made of a metal/nonmetal is? | Ionic |
A compound made of two different nonmetals is? | Molecular |
What must happen during a chemical change in order to make a new substance? | Bonds must break in the reactants in order to form new bonds, and therefore new substances. |
What two things do the coefficients in a balanced chemical reaction mean? | Number of molecule and number of moles |
What evidence supports the existence of a dense, small, positively charged nucleus? | Gold foil experiment; positively charged particles were shot at gold foil and only some of them bounced off (debunking Thomson's "sea of negative charge"). |
What is mass number equal to? | Protons + neutrons. |
Define electronegativity | An atom's ability to attract bonded electrons. |
Define ionization energy. | The ease in removing electrons. |
What information do we get from electron configurations? | How many total electrons and what element |