What is the differnce between the atomic number and the mass number of an element?

A cube of an unknown metal is 1.25 inches on each side and has a mass of 128.3741 g. What is its' density?

For the reaction 2co3 + (aq) + 2cl - (aq) →2co2 + (aq) + cl2 (g). e∘=0.483 v what is the cell potential at 25 ∘c if the concentrations are [co3+] = 0.383 m, [co2+] = 0.369 m, [cl-] = 9.00*10-2 m, and [cl2] = 0.150 m?

Explain how an ionic compoud made up of charged particles can be electrically neutral?

Judy wanted to figure out the mass of her backpack. She put the pack on a balance and added 3, 6, and 4 kg weights so that the balance was even. What is the mass of her backpack? A) 5kg B) 9kg C) 10kg D) 13kg

Animals with reproduction dependent on internal fertilization need all of the following except

Select the correct answer. A man pours some hot coffee into a small cup from a large jug that contains enough coffee for several cups. Which statement correctly compares the coffee in the cup and in the jug? A.

Is sponge cake a heterogeneous mixture

Describe three skills people use to conduct scientific investigations

The surface temperature on Venus may approach 739 K. What is this temperature in degrees Celsius?

Complete the acid-base reaction between butyric acid HC4H7O2 and potassium hydroxide KOH. Do not include phase designations for any of the reactants or products. Be sure to include the charge for any charged species.