wat 10 points!!!!?

Question

just answer these questions. (u dont need to answer both)


wat affect does observing a substance's physical properties have on a subsnce?


why is burning a chemical change in wood?

Answer 1

Burning is a chemical change in wood because when it is been burnt it is broken down into different elements such as ash, carbon monoxide and changes it's appearance physically and chemically.

By, the way, nothing is done to the physical properties if you observe them.

Answer 2

In science, the observer effect refers to changes that the act of observing has on the phenomenon being observed. For example: observing an electron will change its path. Not only does this happen because the observing light or radiation contains enough energy to disturb it, but it also happens if no measurement is made and if only it becomes possible to make such a measurement. An example of the latter is the Aharonov-Bohm effect.

In quantum mechanics, if the outcome of an event has not been observed, it exists in a state of superposition, which is being in all possible states at once. The most famous example is the thought experiment Schrödinger's cat, in which the cat is neither alive nor dead until observed — until that time, the cat is both alive and dead (technically half-alive and half-dead in probability terms). However, it is not clear that quantum observation requires a human or sentient observer.

In physics, a more mundane observer effect can be the result of instruments that by necessity alter the state of what they measure in some manner. For instance, in electronics, ammeters and voltmeters usually need to be connected to the circuit, and so by their very presence affect the current or the voltage they are measuring. Likewise, a standard mercury-in-glass thermometer must absorb some thermal energy to record a temperature, and therefore changes the temperature of the body which it is measuring.

The Heisenberg uncertainty principle is frequently, but incorrectly, confused with the "observer effect," as it relates precision in measurements related to changes in velocity and position of certain particles relative to the perspective the observer takes on them.

Answer 3

1)umm...not sure about the first one

2)burning wood is a chemical change because it has changed into a different substance. Basically, it's not wood anymore.

Answer 4

1. Nothing
2. When wood is burnt chemical change take place...which is release of CO2 and water vapor.

I hope this helps!!

Answer 5

nothing.

huh?