Select all the items on the following list that are ions.

cu

po4-3

hco3-

al+3

hg2+2

na2co3

fe

zn

2) Which of the following statements best describes an element? A) a material that has consistent physical properties B) a material with more than one type of atom C) a material that is pure D) a material that has consistent chemical properties E) a

How many moles of na are needed to produce 4 moles of nacl in this reaction? 2na + cl2 → 2nacl?

Phosphorus is most abundant in the

Hot tea is best when served in china tea cups. True False

When standardizing an iodine solution, 30.37 mL of the solution was required to completely oxidize 10.00 mL of a 5 mg/mL solution of ascorbic acid. What is the molarity of the titrant?

A percent composition analysis yields 46.7% nitrogen and 53.3% oxygen. What is the empirical formula for the compound

A rock has 12.5 percent of its original amount of potassium-40 remaining in it; potassium-40 has a half-life of 1.25 billion years. How long ago was the rock formed? A. 1.25 billion years ago B. 2.5 billion years ago C. 3.75 billion years ago D.

Calcium is an element. What is the smallest particle of calcium that has all the chemical properties of calcium?

Which is the best term to use when describing the energy of motion

The pka of hypochlorous acid is 7.530. a 54.0 ml solution of 0.114 m sodium hypochlorite (naocl) is titrated with 0.337 m hcl. calculate the ph of the solution