Carbon tetrachloride is a solvent which is used as a refrigerant and also as a cleaning agent. It is mainly produced from methane (CH4) and chlorine gas (Cl2):
CH4 + 4 Cl2 --> CCl4 + 4 HCI
How many grams of carbon tetrachloride (CC14, molar mass = 153.81g/mol) can be
produced from reacting 497.9 grams of chlorine (Cl2, molar mass = 70.9 g/mol) with
excess methane? Round your answer to the nearest tenths place.

it would be d. henry moseley

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it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

the answer is d.) potassium