Why is an element considered a pure substance?

Which of these equations correctly expresses the self-ionization of water? A) Upper H subscript 2 upper O superscript plus upper H subscript 3 upper O superscript plus double-headed arrow upper H subscript 2 upper O plus upper O upper H superscript

Which of the following is not typically used as a food preservative? A. calcium citrate B. sodium propionate C. vitamin E D. potassium sorbate

Describe endothermic vs. exothermic reactions in terms of product formation. (hint: what happens when products are formed?)

What parts of a wave are used to determine the wavelength of that wave

Germanium is a group 4A semiconductor. The addition of a dopant atom (group 3A element) that has fewer valence electrons than the host atom results in a p-type semiconductor.

What is the square root of 54554? What is the square root of 35654?

Halogens have ... Electron affinity

Observe: Change the Surface area from Minimum to Maximum. You can imagine that a solid reactant has been dissolved in a liquid. How does this change how many Reactant B molecules are exposed to Reactant A?

When placed in a 200-mL square box, a substance has a spherical shape and has a volume of 75 mL When placed in a 200-mL circular tube, the same amount of that same substance has a spherical shape and a 75-mL volume.

What is the example to the word camouflage