The answer is; 6
The atomic number of magnesium (the number of protons ) is 12. Since the mass number is the number of protons + neutrons. The neutron number can be derived as 24 -12 = 12.
Since she already has 6 neutrons, she needs to add (12 – 6) more neutrons = 6
M (NaCl) = n × M = 3.75 × 58.5 =
219.375 g
M (NaCl) = 23 + 35.5 = 58.5 g/mol
Answer: a.polluted runoff into nearby ponds
Explanation:
Answer:
C. the boiling point of water
Explanation:
B is correct because boiling point only usually differs among the same substance when pressure changes. So say you take one solution onto a mountain top and another at sea level, the boiling point will not be the same, but here we assume they are in the same place so it won't.
A cannot be because the containers are all different shapes (and we aren't talking about like molecular shape of water from what I assume, we mean macroscopically, so that can't be).
B cannot be because we have 4 different temperatures.
D cannot be because we have 4 different temperatures, and therefore different amounts of steam will be released per minute as not all the waters have reached boiling.
