When an atom of calcium (Ca) forms an ion by losing two electrons, what is the ion’s type and charge? cation, 2+

anion, 2−

cation, 2−

anion, 2+

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

Which best explains why an iceberg floats?

Provide a stepwise curved arrow mechanism that fully explains the outcome of the reaction shown below. oh нао* heat он