Which of the following elements is a highly reactive nonmetal? A. iron (Fe) B. sodium (Na) C. flourine (F) D. helium (He)

In two or more complete sentences, explain how to calculate the amount of energy that is transferred when 150 g of cooper cools from 63.0 °C to 21.0 °C. Is the energy absorbed or released? The specific heat of copper is 0.387 J/g*°C.

Explain why the quantum number set (3,3,-2, + 1/2) is not possible for an electron in a ground-state atom

6. Identify each element as a metal, metalloid, or nonmetal a. gold b. silicon C. sulfur d. barium

Loudness is expressed in

Which compound is produced when HCl (aq) is neutralized by Ca (OH) 2 (aq) ? (1) CaCl2 (3) HClO (2) CaH2 (4) HClO2

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

What is the net amount of energy released when 1 mole of H2O is produced

Why is Sn (SO4) 2 named Tin (IV) Sulfate and not Tin (II) Sulfate?

An element x forms an iodide (xi3) and a chloride (xcl3). the iodide is quantitatively converted to the chloride when it is heated in a stream of chlorine: 2xi3+3cl2â2xcl3+3i2 if 0.5500 g of xi3 is treated, 0.2596 g of xcl3 is obtained.

When you kick a soccer ball across a field it will eventually come to a stop. Does this prove or disprove Newton's first law of motion? It disproves Newton's first law of motion because gravity is stronger than friction.