In the first part of this example, you have (6.63 x 10-34 J/Hz) x (2.3 x 1016 Hz) You multiply the numbers: 6.63 x 2.3 = 15 then the exponents. Since you are multiplying, you add the exponents: (10-34) x (1016) = 10(-34 +16) = 10-18 Thus, the answer is 15 x 10-18, but that is not standard. To make it standard, yo...
We indeed cannot and never have seen atoms. As stated in the text, it is, in fact, impossible to see atoms, as light cannot bounce off of a single atom, which is necessary for us to see them. Thus, we will never be able to see atoms. Nevertheless, we can study things that we cannot see. We know a lot about gravit...
When you CHANGE THE AMOUNT of a solid, that does not affect the equilibrium. However, you are not changing the amount of CaCO3. You are changing the temperature, and that DOES affect the reaction. The effect is to shift it to the products, so CaCO3 gets used up. If you asked what would be the change in CO2 if the amo...
The term _significant _DOES NOT mean "mathematically important." Certainly, the zero at the end of 350 is mathematically important. However, it is NOT significant. Remember, the term significant figure simply means that the figure was MEASURED. When you write a number as 350, you are telling scientists that the measuri...
You must remember what you learned in Modules 4 and 5. In Module 4 (pp. 136-145), you learned how to determine the chemical formula of simple ionic compounds. In Module 5 (pp. 177-181), you learned the same technique and applied it to ionic compounds which involve polyatomic ions. At the same time, you were required to...
The placement of the atoms does not matter. Remember, these molecules are NOT flat. They are three-dimensional. This particular molecule is tetrahedral. If you put the F’s across from each other, they will not cancel one another out, as there would still be a net DOWNWARD AND INTO THE PAPER pull by the F’s and a net UP...
You start out with: H3PO4 + Mg(OH)2 –> Mg3(PO4)2 + H2O Stay away from the H’s and O’s at first, because they appear in multiple substances on at least one side of the equation. Thus, we start with P and Mg. To balance P, multiply H3PO4 by 2: 2H3PO4 + Mg(OH)2 –>Â Mg3(PO4)2 + H2O To balance Mg, multiply Mg(OH)2 by...
That’s a good idea, but there is one problem. When you use ionic solutes, you have to worry about two things: interactions with the radiator and residues formed around the seals. Most readily available ionic compounds will chemically interact with the wall of the radiator, corroding it or otherwise breaking it down. Al...
Atoms and molecules in their gas state cannot REFLECT light. They are not like mirrors. They are too spread out to do that. They can ABSORB light – that’s all. Ozone blocks ultraviolet light by absorbing ultraviolet light. You will learn in Module 4 that atoms can only absorb fixed wavelengths of light, because the w...