8.3 kJ of energy is remaining in the battery.
Explanation:
According to conservation of energy, the tendency of energy is to convert it from one form to another. So if the battery has an energy of 3.6 kJ at first and then it has utilized as 2.1 kJ of energy. So after loosing this energy, it will be 3.6-2.1 = 1.5 kJ of energy.
Again it is stated that the battery is recharged with 6.8 kJ of energy.
Then the modified or the latest energy stored in the battery will be the sum of energy present in the battery after using flashlight with the energy added in the battery by charger.
So, the total energy stored in the battery = 6.8+1.5 = 8.3 kJ
Thus, 8.3 kJ of energy is remaining in the battery.
65 Grams is the mass of the beaker because you just take the mass of Water + Beaker and take the water away now you have the mass of the beaker
Answer:
* No precipitate:
* Precipitate:
* Precipitate:
Explanation:
Hello!
In this case, since these all are double displacement reactions, in which the cations and anions are exchanged, we can write the resulting chemical reactions as follows:
a. LiOH and NaCl: No precipitate is formed since LiOH and NaOH are both largely soluble in water:
b. BaCl2 and Na3PO4: barium phosphate precipitate is formed because it has a large molar mass which makes it insoluble in water:
c. MgSO4 and KOH: magnesium hydroxide "milky" precipitate is formed because it is not soluble in water:
Moreover, we can relate the solubility of a substance by considering its polarity, molar mass and nature; usually, heavy substances tend to be insoluble in water as well as nonpolar compounds.
Best regards!
Moles of Zn present= 2.36/65.4= 0.0361 moles
Therefore maximum moles of ZnO= 0.0722
Mass of one mole of ZnO= 81.4
Mass of ZnO produced= 0.0722 x 81.4= 5.87g
Answer:
A heatwave occurs when a system of high atmospheric pressure moves into an area and lasts two or more days.
Explanation:
In such a high-pressure system, air from upper levels of our atmosphere is pulled toward the ground, where it becomes compressed and increases in temperature.