Name an element in the third period (row) of the periodic table with one valence electron.

The first law of therodynamics state that AE = Q - W. is this also a statement of the principle of a conservative of energy?

The mercury content of a stream was believed to be above the minimum considered safe-1 part per billion (ppb) by weight. an analysis indicated that the concentration was 0.68 parts per billion. what quantity of mercury in grams was present in 15.

How many valence electrons does a neutral lanthanide atom have?

An unstable isotope that naturally decays CAN emit which of the following? Choose all correct responses, there are at least two.

Name an element that has properties similar to those of Chlorine. Don't need to explain

The volume of 1 mole of o2 gas at T=273k P=1atm is? A 6.02 x 10^-23 ml B 760 L C 22.4 L D 2.24 L E 224 L

What is one way to tell that a solid has formed a solution with water?

The terms vitrification, oxidation, water smoking, and flashing are all associated with: Select one: Select one: a. spanning openings with bricks or other masonry units. b. cleaning bricks after masons install them. c.

In the reaction Mg+Cl2=MgCl2 what should be the coefficient for Cl2

A 25.0-g sample of barium reacted completely with water. What is the equation for the reaction? How many milliliters of dry H2 evolved from 21C and 748mmHg?