Answer:
A. The number of electrons of a neutral atom always equals the number of protons.
Explanation:
Because the atom is neutral, meaning it has no charge, the protons and electrons would therefore have to be the same. Electrons carry a negative charge while protons carry a positive charge. If you had one more electron than proton, you would have a charge of -1. If they are equal, it would have no charge and be named neutral.
Answer:
(3) 4 cm' and 2.0 g/cm3
Explanation:
Given:
volume= V= 8 cm³
mass= m= 16 g
The density is the mass per volume of a substance, so the density of the rock is:
density= d= 16 g/8 cm³= 2 g/cm³
When we cut the rock in half, we have a half volume and a half mass:
V= 8 cm³/2= 4 cm³
m= 16 g/2= 8 g
But the density is not altered because it is an intrisic property - it does not change with the amount of subtance. Thus, the density of a half rock is:
d = m/V= 8 g/4 cm³= 2 g/cm³
Answer:
Serum potassium level of 2.6 mEq/L
Explanation:
Chemotherapy has many side effects like nausea, vomiting, diarrhea, fatigue, fever, etc. Vomiting and diarrhea can affect the fluid and electrolyte balance adversely in the body. This can lead to a reduction in the serum potassium level.
A low level of potassium in the body can lead to weakness, cramp, paralysis, twitch, abnormal heart rhythm, etc. The normal blood potassium level is 3.6 to 5.2 millimoles per liter so a serum potassium level of 2.6 mEq/L is the finding that indicates a chemotherapy-induced complication.
