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

What is the phrase of warm air cold air

A copper atom has a diameter of 128 pm. how many centimeters is a line containing exactly 1.0 moles of copper atoms sequentially arranged? use "e" for scientific notation.

Which properties change the composition of a substance? Physical properties Neither chemical nor physical properties Chermical and physical properties Chemical properties

Atoms of the same element can have different numbers of these, and it will only change the mass of the nucleus, but nothing about the chemical reactivity. neutron, electron or proton

What is solubility? solubility is the minimum amount of a solvent that can be used to make a solution. solubility is the pressure necessary to create a solution. solubility is the temperature that can be used to mix a solution.

What is the force caused by wind pushing on a building?

When you ground a mineral down to give it sides what are those called

How many atoms are in 766.3 grams of Li?

The process by which DNA makes a complete copy of itself is called? A) Duplication B) Development C) Transcription D) Replication

The electron configuration 1s22s22p63s23p6 represents which noble gas?