Answer:
Abdid has most likely found a new dwarf planet.
Explanation:
Dwarf planets are too small to be considered planets, but are also two big to be considered something else. A dwarf planet has to have sufficient mass so that the self-gravity is strong enough to create its round shape. Other qualifications of a dwarf planet is that it has not cleared the neighborhood around its orbit and it cannot be a satellite. Based on the location, size, and shape of the object Abdid has discovered, it is likely he discovered a new dwarf planet in the asterioid belt. One of the most famous is Ceres.
Ca(OH)2
In order to balance this, you have to count each element where the elements in the reactants side and the product side should have equal number of molecules. The balanced reaction is as follows:
2HCl + Ca(OH)2 = CaCl2 + 2H2O
B) linear
C) tetrahedral
D) trigonal pyramidal
Answer:
D. The melting of ice
Explanation:
An endothermic reaction ABSORBS heat from its surroundings, it does NOT give heat off into its surroundings.
so...
When a match burns, it gives of heat. So A is incorrect.
When water goes from a vapor into a liquid, the water molecules loose kinetic energy, they do not gain it. And since temperature is the measure of the average kinetic energy in a substance, the water vapor looses heat. If the process was endothermic, it would be gaining heat. So B is incorrect.
When propane gas combusts, the explosion lets off heat into its surroundings, it does not absorb heat. So C is incorrect.
Here's what happens when something melts: the molecules inside the substance receive more and more kinetic energy, until the substance's molecules have enough kinetic energy to vibrate and wiggle past each other, breaking their structure. When ice melts it is receiving kinetic energy from its surroundings, and again, since temperature is the measure of the average kinetic energy in a substance, the process is absorbing heat. Q.E.D.,
D is the correct answer.
b) 4.6 cm x 1.586 cm
Answer:
a. 5.82km
b. 7.2956cm
Explanation: