A system used to represent the valence electrons around the chemical symbol of an element is the

How does a homemade balloon barometer work and how does a real one work

When two different liquid chemical compounds at room temperature are mixed together, the beaker they are poured into is icy to the touch. What kind of reaction is this an example of? A. a fission reaction B. a combustion reaction C.

Can Iron replace Hydrogen in the following reaction?: Fe (s) + HCl (aq) - - - > H2 (g) + FeCl2 (aq)

A student can eat 4.0 M& Ms every 1.00 seconds. If an M& M has a mass of 63g, determine how many kilograms of M& Ms can be eaten by a class of 20 students in 3.75 hours.

What is the difference between a "characteristic" and a "trait"? Give an example of each.

Carbonic acid (H2CO3) does not dissortate 100 percent in water. What type of substance is it? weak acid Strong base strong acid weak base

The standard enthapy of combustion of solid urea co (nh2) 2 is - 632kjmol-1 at 298k

What happens to an isotopes during radioactive

Why does the effective nuclear charge increase across a row of the periodic table?

Iodine-131 decays to form xenon-131. the half-life of this reaction is 8.07 days. from a 200-g sample of iodine-131, how much of the sample is xenon-131 after 16.14 days?