What is the percent composition of oxygen found in h2o?

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull

What is the solubility-product constant of barium sulfate, baso4, if a saturated solution is 1.03 ´ 10-5 m?