Name 3 sets of elements that have been added to the periodic table since mendeleev's time

Coal and Diamond are two different form of carbon. which is denser?

Assuming the final solution will be diluted to 1.00 l, how much more hcl should you add to achieve the desired ph?

The reaction 2 ClO2 (g) + F2 (g) → 2 FClO2 (g) is first-order in both ClO2 and F2. When the initial concentrations of ClO2 and F2 are equal, the rate after 25% of the F2 has reacted is what percent of the initial rate? 1. 37.5% 2. 18.8% 3. 75.0% 4.

Explain why one spark will ignite propane gas and no more sparks are needed for the propane gas to continue burning.

What is the formula for magnesium sulfate hydrate

The period of time that occurred from about 4 to 2.5 million years ago is called the?

Explain why ocean temperatures vary by location on Earth's surface.

You and your lab partner are asked to determine the density of an aluminum bar. The mass is known accurately to 4 significant figures. You use a simple metric ruler to determine its size and calculate the results in column A.

The atom of which element is bigger than an atom of calcium? - Be (Beryllium) - Sr (Strontium) - Sc (Scandium) - Mg (Magnesium)

Draw the hydration shells that form around a potassium ion and a chloride ion when potassium chloride (kcl) dissolves in water. label the positive, negative, and partial charges on the atoms.