Answer: Endothermic reaction
Explanation:
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and
for the reaction comes out to be negative.
Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and
for the reaction comes out to be positive.
As the energy of reactants is 180 kJ and that of products is 300 kJ, the energy of products is greater than that of reactants, which means the energy has been absorbed and reaction is endothermic.
Answer:
333.3mL
Explanation:
Using the formula as follows:
C1V1 = C2V2
Where;
C1 = initial concentration (M)
C2 = final concentration (M)
V1 = initial volume (mL)
V2 = final volume (mL)
According to the information provided in this question,
C1 = 4.00M
C2 = 1.50M
V1 = 125mL
V2 = ?
Using C1V1 = C2V2
4 × 125 = 1.5 × V2
500 = 1.5V2
V2 = 500/1.5
V2 = 333.3mL
Therefore, the CuSO4 solution needs to be diluted to 333.3mL to make 1.50 M solution.
Answer:
Following are the answer to this question:
Explanation:
In the given question an attachment file is missing, that is attached. please find the attached file, and the following are the description of the given points:
a. At 100 degrees in 100 mL 5 g is dissolved.
For, it required:
![\to 2g = 100 \times \frac{2}{5}](https://tex.z-dn.net/?f=%5Cto%202g%20%3D%20100%20%5Ctimes%20%5Cfrac%7B2%7D%7B5%7D)
b. At 0 degrees 100 mL dissolve in 0.3 g.
So, the dissolve:
![\to 40 \ ml= 0.3\times \frac{40}{100}](https://tex.z-dn.net/?f=%5Cto%2040%20%5C%20ml%3D%200.3%5Ctimes%20%5Cfrac%7B40%7D%7B100%7D)
![= 0.12g.](https://tex.z-dn.net/?f=%3D%200.12g.)
After refrigeration 0.12 g will still be dissolved.
c. After dissolving and freezing, precipitation can occur which would still be impure if the cooling is instantaneous. The added solvent was also too hard to recrystallize. The solvent was placed below its place of reservation.
d. Recovery percentage:
![\to \frac{0.8}{2}\times100](https://tex.z-dn.net/?f=%5Cto%20%5Cfrac%7B0.8%7D%7B2%7D%5Ctimes100)
![\to 40 \ \%](https://tex.z-dn.net/?f=%5Cto%2040%20%5C%20%5C%25)
The melting point of acetanilide:
![\to 114.3^{\circ}.](https://tex.z-dn.net/?f=%5Cto%20114.3%5E%7B%5Ccirc%7D.)
Found=109(medium)
Melting point error percentages:
Calcium forms an ionic bond to iodine and forms calcium iodide (CaI2). The calcium atom gives away 2 of its valence electrons, one to each of the 2 iodine atoms thus forming the ionic bond.
Answer: A
Explanation:
A contour interval is a vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line.