During a lab activity, students calculate the density of an element to be 7.78 g/cm3. The density listed on the periodic table is 7.13 g/cm3. Calculate the percent error and identify the element.

Tightly bound group of atoms that behaves as a unit and carries a net charge is what?

Why does chemical safety remain a concern today? A. Chemists really don't know what to do with dangerous chemicals. B. Chemists are constantly learning more about what makes chemicals dangerous. C.

List three factors that affect reaction rates.

Which properties are characteristic of metalloids?

Two liquids are shaken together in a test tube to produce a uniform liquid that does not separate into layers. Which of the following best describes the behavior of the above pair of substances? soluble insoluble miscible immiscible

How do valence electrons relate to the chemical reactions of an element?

What is the weighted-average mass of all known isotopes for an element

What is the Celsius equivalent of 212°f

Identify the characteristics of tornadoes and hurricanes

When magma intrudes parallel to another rock layer, the formation is called a (n) A. sill. B. dike. C. extrusion. D. unconformity.