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.

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

For each of the following compounds, decide whether the compound's solubility in aqueous solution changes with ph. if the solubility does change, pick the ph at which you'd expect the highest solubility. you'll find ksp data in the aleks data tab. compounds does solubility change with ph

Quickly what are the following of organisms that existed over a wide area but only for a limited time period called a. soft fossils b. mold fossils c. index fossils d. trace fossils