The pH of a 0.25 M aqueous solution of hydrofluoric acid, HF, at 25.0 °C is 2.03. What is the value of Ka for HF?

6.0 * 10-5

3.5 * 10-4

1.1 * 10-9

2.0 * 10-9

none of the above

A sample of hydrogen peroxide (H202) has 2.0 grams of hydrogen (H) and 32 grams of oxygen (O). What is the percent composition of hydrogen peroxide

How many iron atoms are in 5.4 mol of Fe203?

How much water is needed to dilute 1 liter of 90% isopropyl alcohol to make a 70% alcohol solution? A. 2.86 mL B. 28.6 mL C. 286 mL D. 2860 mL

Which of the following is FALSE? 1. The mass of a hydrogen atom is about the same as a proton 2. The mass of a proton is much greater than the mass of an electron 3. The mass of protons and neutrons are about the same 4.

What substance is a yellow solid and melts at 115 degrees celsius?

The most common element in the atmosphere are

What Is the name of the force that holds together the sub Tomic particles of the nuclear?

Henry Moseley used X-ray experiments to determine the atomic number of elements. How did his discovery contribute to the development of the periodic table? A. It confirmed that elements should be arranged in strict order of increasing atomic mass. B.

Does pollution stay in the city where it originates

Cao (s) + h2o (l) = ca (oh) 2 (s) what mass of slaked lime can be produced from a mixture of 28.4 g of cao and 13.3g of h20