Answer:
writing.
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Answer:
When chromium chloride, CrCl2, is dissolved in water, the temperature of the water decreases. ... The attractive forces between water molecules and chromium and chloride ions is stronger, because the reaction is endothermic means the energy released in formation is less than the energy required in breaking bond.
Answer:
#1
The temperature that this happens is called the freezing point and is the same temperature as the melting point. As more energy is put into the system, the water heats up, the molecules begin moving faster and faster until there is finally enough energy in the system to totally overcome the attractive forces.
Explanation:
#2
Heating a liquid increases the speed of the molecules. An increase in the speed of the molecules competes with the attraction between molecules and causes molecules to move a little further apart. ... A decrease in the speed of the molecules allows the attractions between molecules to bring them a little closer together.
Answer:
Density = 7.87 grams per mL
Explanation:
Density is given by the formula:
where
Z = effective number of atoms in one unit cell.
M = Molecular mass of the substance
a = edge length of unit cell
Na = Avogadro number = 6.022×10²³
In this case:
Z=2 as it is body-centered type unit cell
M = 56 g per mole for iron
a = 287 pm = 
Substituting the above values in the density formula we get:
Density of iron is 7.87 grams per mL.
Answer:
A
Explanation:
because you can turn the melted iron back to the solid it was before
