It is a good idea because when mercury heats up, the molecules spread farther apart. Therefore, making them look to have expanded. Thermometers that are digital use a sensor to, as you would say feel the temperature around it.
A is the answer because the others don't make sense. B if you put glass over reactants it doesn't change anything in the reaction. C using a solid with a low surface area will actually be doing the opposite, a higher SA will increase the rate of reaction. D decreasing the concentration will decrease the reaction
Answer:
True becouse any graphs can show info
NH4^+ + OH^- ==> NH3 + H2O
<span>Set up an ICE chart. </span>
<span>initial: </span>
<span>NH4^+ = mL x M = 100 x 0.1 = 10 millimoles </span>
<span>NH3 = mL x M = 80 x 0.20 = 16 millimoles. </span>
<span>change: </span>
<span>we add 0.2 g NaOH which is 0.2/40 = 0.005 moles or 5 millimoles. </span>
<span>NH3 = +5 millimoles </span>
<span>NH4^+ = -5 millimoles </span>
<span>equilibrium: </span>
<span>NH3 = 16 + 5 = 21 millimoles. </span>
<span>NH4^+ = 10 - 5 = 5 millimoles. </span>
<span>You may substitute millimoles in place of concn (since millimoles/mL = molarity and the mL (180 mL) appears in both numerator and denominator) OR you can divide millimoles/180 mL to arrive at concn for both base and acid and substitute those numbers. Plug those into the HH equation and solve for pH. </span>
<span>For part d, just set up the HH equation and pH = pKa + log (base/acid). The question is asking you to calculate pH if base and acid were equal. So plug in the same number (any number you choose) for base and acid and calculate. Note that the log of 1 = 0</span>
Answer:
Helium is in the <u>Noble Gases</u> family. All elemnts in this family have <u>eight</u> valence electróns, except for Helium which has 2. Some chemical properties of elements in this family are <u>odorless</u><u> </u><u>and</u><u> </u><u>colorless</u><u>.</u>