Why do solids have different densities

In the hydrogenation of ethylene using a nickel catalyst, the initial concentration of ethylene is 1.50 mol * L-1 and its rate constant (k) is 0.0016 mol * L-1 * s-1. a. Determine the rate of reaction if it follows a zero-order reaction mechanism.

Bromine (Br,) is observed as a red-brown color During the bromination of benzene, an electrophilic aromatic substitution, why does the red-brown color of Br2 disappear as the reaction progresses? a.

What feature of the ocean allows it to alter weather patterns?

Vaccination against the flu should be required

Ydrogen and fluorine combine according to the equation h2 (g) + f2 (g) → 2 hf (g) if 5.00 g of hydrogen gas are combined with 38.0 g of fluorine gas, the maximum mass of hydrogen fluoride that could be produced is

When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any time

The highest cloud are known as

What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

If element x has 95 protons how many electrons does it have

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda