A student isolated 25 g of a compound following a procedure that would theoretically yield 81 g. What was his percent yield?

Can an element with eight valence electrons still be reactive?

28.5g of iron shot is added to a graduated cylinder containing 45.50 mL of water. The water level rises to 49.10mL mark, From this info, calculate the density of iron.

One of the many reactions which occur when iron ore is smelted in a blast furnace is given below. For this reaction, the equilibrium constant in terms of partial pressures, Kp, is 0.900 at 873 K and 0.396 at 1273 K.

A 52.0 mL volume of 0.25 M HBr is titrated with 0.50 M KOH. Calculate the pH after addition of 26.0 mL of KOH at 25 ∘C.

Calculate the force of Attraction between two masses one of 5kg and one of 8kg whose center are 10 cm apart

A chemist in an imaginary universe, where electrons have a different charge than they do in our universe, performs the millikan oil drop experiment to measure the electron's charge. the charges of several drops are recorded below.

When an ionic bond forms, which part (s) of the atoms are directly involved?

When a 3.00 g 3.00 g sample of KBr KBr is dissolved in water in a calorimeter that has a total heat capacity of 1.36 kJ ⋅ K - 1, 1.36 kJ⋅K-1, the temperature decreases by 0.370 K. 0.370 K. Calculate the molar heat of solution of KBr. KBr.

How many moles of oxygen are required to fully react with 100 kg of lead sulfide?

Predict the electronegativity of the yet undiscovered element with Z = 119.