Answer:
-2,438 J energy is released
Heat energy is released
Explanation:
The formula for energy absorbed or released is Q = mT(Cp)
Get temperature in degrees T = 21 - 63 = -42°C
Mass of the cooling cooper m = 150g
Specific heat of copper Cp = 0.387J/g-°C
Put all the above parameters into the formula for energy absorbed or released
Q = mT(Cp)
= 150 x -42(0.387)
= -2438J same as -2.438 KJ
-2438J energy is released
Answer,
Add water to dissolve the salt solution.Shake the solution,oil and water are immiscible liquids therefore oil will not dissolve.Put the solution in a separating funnel and leave the solution undisturbed for a few minutes.Water is denser than oil there oil will come to the top.Power the lower layer of water in to a beaker.Boil the water until water turns into vapour leaving the salt behind.
Answer:
Following are the explanation of the Rube Goldberg device:
Explanation:
According to the Rube Goldberg devices, which conform with "the energy conservation law," choose a chain of events to carry out such a basic task differently, for this unit, a range of instant theatrical resources are converted into possible energy. It is also responsive to an energy conservation law.
- It is the unit that produces theatrical power when quartz falls off from the roof. Instead, its marble hits or falls into a plastic bottle, its velocity converted into potential energy which lifts its soda bottle. Its next marble, when the stone came in contact with it, can pass angular momentum to some other marble. Its gravitational force of quartz drops. It has been built into kinetic energy, distributed only to Nando.
- All energy of every domino becomes passed to another in a domino effect before the last one takes its contraption off because as the mousetrap gets off, all of the stored potential energy is released and the cutters were also removed. Its sequence which binds its puck is cut, which also frees the ballon as well as stores its electricity.
Answer:
Buffers are resistant to high pH changes.
Explanation:
This perfectly explains the reason why we use buffers. Buffers are substances which consist of a weak acid and its conjugate base. Buffers are resistant to significant pH changes upon addition of strong acids or bases. To illustrate this, let's say we have a buffer consisting of 0.1 mol of HF, a weak acid, and 0.1 mol of NaF (fluoride is a conjugate base of HF).
- Let's say we add some strong acid, in a general form, this acid would be represented as
. In this case, conjugate base will react and neutralize it to produce some amount of HF: 
. - Similarly, if we add some strong base
, the acidic component will react with it to produce some amount of conjugate base: 
. The ratio of HF to NaF in this case is held around the same value for addition of small amounts of strong acids/bases, so pH is kept almost constant, while in neutral water, pH would drastically increase or decrease.
Answer:
Explanation:
An airplane cabin is pressurized to 570 mmhg. what is the pressure inside the cabin in atmospheres? a commercial jet takes off from earth's surface and enters the stratosphere
