Question 20 (1 point) In the lab, a student prepared a solution of ammonium chloride in water. The student
placed 9.5 g NH4Cl in a beaker and added 35.0 g of H20. The initial temperature of
the water was 27°C. The student stirred the mixture, and the final temperature of
the solution was 16°C.
12
which is called
In this solution, the substance that is being dissolved is
the
15
O H20; solvent
18
O NH4Cl; solute
NH4Cl; solvent
H20; solute

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates

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.