Which of the following statements is true?

1. dalton believed atoms were made mostly of empty space.
2. plasmas have a net negative charge.
3. the number of protons in an element is always equal to the number of neutrons.
4. solids have a fixed mass, volume, and shape.

Phosphorous acid, h3po3(aq) , is a diprotic oxyacid that is an important compound in industry and agriculture. the values of phosphorous acid are 1.30 6.70 calculate the ph for each of the given points in the titration of 50.0 ml of 1.5 m h3po3(aq) with 1.5 m koh(aq) .

The grooves or folds of the brain are called

Which process transfers heat from inside earth to its surface? convection currents in mantle pulling away of tectonic plates drawing in of tectonic plates convection currents in crust