What element in what group and period shares the same physical and chemical properties as chlorine

Sylvanite is a mineral that contains 28.0% gold by mass. How much sylvanite would you need to dig up to obtain 73.0 g of gold?

A car travels a total of 10,000 meters.

Determine the equilibrium constant, keq, at 25°c for the reaction 2br - (aq) + i2 (s) br2 (l) + 2i - (aq).

A student took the weighted average of the isotopes that make up one element. What was the student trying to determine? A. The atomic number of the element B. The atomic mass of the element C. The number of electrons in the element D.

The density of ethanol at 20 C is 0.791 g/mL. How many milliliters of ethanol correspond to 12.0 g of ethanol at 20 C?

Given the reaction 2NaOH + H2SO4 = Na2SO4 + 2H2O, what is the total number of grams of NaOH needed to react completely with 196 grams of H2SO4

The mass flow rate of gasoline leaving a refinery is 1610 kg/min. The specific gravity of a gasoline is 0.700. A retail gasoline pump is able to fill a 20.0 gallon automobile tank in 1.80 minutes.

Calculate the solubility of cux (ksp=[cu2+][x2-]=1.27*10-36) in a solution that is 0.190 m in nacn.

An atom has seven valance electrons which element could have this type of atom

How is the ocean important to human survival? restate the question