Which of these pairs of elements have the same number of valence electrons

phosphorus (P) and chlorine (Cl)

beryllium (Be) and calcium (Ca)

chlorine (Cl) and helium (He)

oxygen (O) and carbon (C)

Which monomer is most likely to form an addition polymer? a substituted hydrocarbon, such as chloroethane an unsaturated hydrocarbon, such as propene a compound with a carboxyl group and an amino group a saturated hydrocarbon, such as ethane?

What is the concentration of a solution of (a) KOH for which the pH is 11.89; (b) Ca (OH) 2 for which the pH is 11.68

What is the correct order of the bonded molecules that make up ATP? a. nitrogen - carbon - adenine - phosphate - phosphate - phosphate b. adenine - ribose - PO3 - PO3 - PO3 c. adenine - ribose - ribose - phosphate - phosphate - phosphate d.

If 4 moles of gas are added to a container that already holds one mole of

Stained glass consists of colored dyes mixed with silicon dioxide molecules. Variations in the color of the glass occur because the dyes often do not mix completely with the silicon dioxide.

List at least two chemical reactions that resulted in a yellow, orange, or red precipitate. For these reactions, list the possible chemical name of the precipitate.

You place air in a sealed can at stp. ypu triple its absolute temperture (K) while leaveing the volume constant. what happenes to the pressure

A current of 10.4 a is applied to 1.25 l of a solution of 0.552 m hbr converting some of the h + to h2 (g), which bubbles out of solution.

What is a greenhouse gas?

Which statement best describes a mole?