Which of the following elements are metals? A.
fluorine (F) and argon (Ar)
B.
iodine (I) and carbon (C)
C.
oxygen (O) and selenium (Se)
D.
potassium (K) and chromium (Cr)

When an object falls through the air and encounters air resistance its overall speed will be than if it had not encountered air resistance? (one word answer)

Word equation for k+ h2o yield koh + h2

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride