Answer:
c) Cohesive forces stronger than adhesive forces reduce the height of the liquid in the capillary tube, whereas adhesive forces stronger than cohesive forces increase the height of the liquid.
Explanation:
Two types of forces bring about capillary action.
One is <em>cohesion</em><em>, which is the intermolecular attraction between like molecules (that is, the liquid molecules)</em>. The second force, called a<em>dhesion</em><em>, is an attraction between unlike molecules, such as those in a liquid and in the sides of a glass tube.</em>
If adhesion is stronger than cohesion, the contents of the tube will be pulled upward. This process continues until the adhesive force is balanced by the weight of the liquid in the tube.
We can’t understand u to answer this
Answer:
a) 0.1783 mol
b) 1.07*10^23 atoms
Explanation:
Step 1: Data given
Mass of gold (Au) = 35.12 grams
Molar mass of gold (Au) = 196.97 g/mol
Number of Avogadro = 6.022 *10^23 /mol
Step 2: Calculate number of moles gold
Number of moles = Mass of gold / molar mass of golf
Number of moles = 35.12 grams / 196.97 g/mol
Number of moles = 0.1783 moles
Step 3: Calculate number of atoms of gold
Number of atoms = number of moles * Number of Avogadro
Number of atoms = 0.1783 * 6.022 *10^23/ mol
Number of atoms = 1.07*10^23 atoms
72g H2O x 1 mol H2O/18.02g H2O = 3.99 mol H2O
Iron does not rust from oxygen itself. Iron needs to be in contact with H2O, which is water and oxygen. So just keep iron out of contact with water, or when you do, make sure you wipe the iron dry. :) Hope this helps!
