What is the empirical formula of a compound made up of 0.556g C and 0.0933g H?

Which of the following are correct statements? Check all that apply. A. Potassium (K) and magnesium (Mg) are not in the same periodic table period. B. Potassium (K) and magnesium (Mg) are both nonmetals. C.

Elements in the same group on the periodic table have the same number of electrons number of protons number of neutrons number of valence electrons

If the smallest markings on a graduated cylinder are one tenth (1/10) of a milliliter, which of the following measurements could be recorded using that graduated cylinder? 10 mL 10.1 mL 10.05 mL 10.050 mL

Which of the following statements provides the BEST explanation for the many chemical similarities between two elements in a Main Group? (Note: only ONE answer here.!) (a) They have similar atomic mass values.

What is the purpose of a periodic table?

The Ka of a monoprotic weak acid is 6.07 * 10-3. What is the percent ionization of a 0.179 M solution of this acid?

What does LeChatelier's principal mean

How many milliliters of a 0.7% stock solution are required to make 2 l of 0.2% solution? how many ml of solvent will be required to carry out the dilution?

What percentage of the naphthalene molecules emitted a photon?

In an endothermic reaction, heat is absorbed from the surroundings. How does this affect entropy? A. The particles in the surroundings move slower and have decreased entropy. B.