Answer: I’m pretty sure your answer is B
Explanation:
Answer:
A a compound because its parts cannot be separated through physical means.
Explanation:
The sugar is a compound because its parts cannot be separated through physical means.
A compound is a substance composed of two or more kinds of atoms joined together in a definite grouping.
The properties of a compound are distinct from those of the elements that makes them up.
- A compound and an element are both classified as pure substances due to the homogeneity in their composition.
If it is in pure form, then only one type of atom. Negating if it has partially oxidized
Explanation:
Upon dissolution of KCl heat is generated and temperature of the solution raises.
Therefore, heat generated by dissolving 0.25 moles of KCl will be as follows.
![17.24 kJ/mol \times 0.25 mol](https://tex.z-dn.net/?f=17.24%20kJ%2Fmol%20%5Ctimes%200.25%20mol)
= 4.31 kJ
or, = 4310 J (as 1 kJ = 1000 J)
Mass of solution will be the sum of mass of water and mass of KCl.
Mass of Solution = mass of water + (no. of moles of KCl × molar mass)
= 200 g + ![(0.25 mol \times 54.5 g/mol)](https://tex.z-dn.net/?f=%280.25%20mol%20%5Ctimes%2054.5%20g%2Fmol%29)
= 200 g + 13.625 g
= 213.625 g
Relation between heat, mass and change in temperature is as follows.
Q = ![mC \Delta T](https://tex.z-dn.net/?f=mC%20%5CDelta%20T)
where, C = specific heat of water = ![4.184 J/g^{o}C](https://tex.z-dn.net/?f=4.184%20J%2Fg%5E%7Bo%7DC)
Therefore, putting the given values into the above formula as follows.
Q = ![mC \Delta T](https://tex.z-dn.net/?f=mC%20%5CDelta%20T)
4310 J =
Thus, we can conclude that rise in temperature will be
.
Answer:
3
Explanation:
A cyclic event is one that happens repeatedly.
The appearance of Hailey's Comet is a cyclic event because it has happened in various occasions in the past on a regular schedule as predicted. We have every reason to believe that the appearance of Hailey's Comet every 75 years will continue to be happen until the comet ceases to exist.