An atom has the following electron configuration. 1s^2 2s^2 2p^6 3s^2 3p^4 How any valence electrons does this atom have?

A fog over a lake. what two changes of state must occur to produce the fog? do the water molecules absorb or release energy during these changes of state? what happens to the motion of the water molecules as a result?

Which practice is a sustainable method of food production? A. Using drip irrigation systems to conserve water B. Allowing chemical pollutants to build up in soil C. Creating a monoculture crop over large areas D.

What classification best describes water H

What was your hypothesis? Plot your data as drops of ascorbic acid vs. time. As the concentration of ascorbic acid was increased, did the rate of the formation of the iodine-starch complex increase or decrease?

Phosphuric acid can form triesters but sulfuric acid cannot. explain why?

When 17.28 mL of a 0.078 M aqueous solution of Na2SO4 is combined with 11.30 mL of a 0.20 M aqueous solution of NaCl and 7.84 mL of a 0.26 M aqueous solution of KCl, what is the total concentration of Na + in the combined solution?

What mass of carbon can 3000 J of energy raise from 12°C to 40°C?

How do you balance __Mg + __HCl - - > __MgCl2 + ___ H2

How many grams of methane, CH4 are produced from the complete reaction of 5.15 moles of carbon monoxide, CO

If you change the state of something, say, liquid to solid, is it a physical or chemical change?