If the empty beaker has a mass of 150 g, the full beaker has a mass of 250 g, and the time interval is 20 sec, determine the uncertainty in the measured fluid mass.

answer: mercury

explanation:

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.