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

3. If the number of particles is increased, the number of collisions per second

Which of the following is true of the water molecule? A. It has a linear shape and is polar B. It has a bent shape and is polar C. It has a linear shape and is not polar D. It has a bent shape and is not polar

Which statement best summarize the relationship between the muscular system and the cardiovascular system? A. The heart is protected from injury by the breastbone. B. Nutrients are carried to the heart through arteries and veins C.

Which will become partially dissociated when dissolved in water? cesium, hydroxide, potassium, hydroxide, nitric acid hydrofluoric acid

What is the half-life for a substance in which 25% of the original remains after 10 days?

What happens when light from the sun passes through any type of matter? the light slows down. the light speeds up. most of the light is absorbed. most of the light is reflected.

What is the chemical name for Fe (HCO3) 2

How are protons, electrons, and neutrons correctly compared

You compare two layers to a because the crust and upper mantle are solid

A substance that speeds up the rate of a chemical reaction is called a. a catalyst. b. a lipid. c. a molecule. d. an element.