Which statements about calcium metal (Ca) and zinc metal (Zn) are true?

Below is an incorrect Lewis Structure for carbon tetrafluoride (CF4).  Select the correct e

Which bond represent polar covalent bonds?

The name of NH4I is:

The VSEPR structure for oxygen difluoride is shown below.  The geometry about the central atom and the bond angle are:

The formula for disulfur trioxide gas is:

455 in. converted to yd. to the proper number of significant figures is: Given 1 ft = 12 in 1 yd. = 3 ft. 1 mi. = 5280 ft

A nurse is hanging an IV bag that contains a 3.0 % potassium phosphate solution.   This means that:

Based on the solubility rules, select the ionic compounds that are insoluble in water. Solubility Rules  Li+, Na+, K+, Rb+, NH4+ All salts containing alkali metal ions and the ammonium ion are soluble     NO3-, C2H3O2- All nitrates and acetates are soluble     Cl-, Br-, I- Most chloride, bromide, and iodide salts are solubleExceptions are Ag+, Hg22+, and Pb2+ which are insoluble     SO42- Most sulfate salts are solubleExceptions are Ca2+, Sr2+, Ba2+, and Pb2+ which are insoluble     CO32-, PO43-, CrO42- Most carbonates, phosphates, and chromate salts are insolubleExceptions are the Group IA elements and NH4+ which are soluble     OH- Most hydroxide salts are insolubleExceptions are Group IA elements and NH4+ which are solubleCa2+, Sr2+, Ba2+ are slightly soluble (considered to be insoluble)     S2- Most sulfide salts are insolubleExceptions are Group IA elements NH4+ and Ca2+, Sr2+, and Ba2+ which are soluble

The correct scientific notation for 0.00521 kg with the proper number of significant figures is: