19) as a nurse, you will be measuring which of the following to determine the force of the blood against the…
19) as a nurse, you will be measuring which of the following to determine the force of the blood against the aorta and other blood vessels?\na) body weight\nb) temperature\nc) blood in urine\nd) blood volume\ne) blood pressure\n20) choose the most stable ion for the element nitrogen.\na) n+\nb) n3-\nc) n2-\nd) n-\ne) doesn’t make ions because it’s a solid\n21) a solution has a density of 0.608 g/ml. what is the mass of 50.0 ml of this solution\na) 3.04 g\nb) 8.22 g\nc) 30.4 g\nd) 129.0 g\ne) 82.2 g\nwhich of the following exhibits a physical change?
Answer
19.
Brief Explanations:
Blood pressure is the force of blood against blood - vessel walls. Body weight, temperature, blood in urine, and blood volume do not measure this force.
Answer:
E. Blood pressure
20.
Brief Explanations:
Nitrogen has 5 valence electrons. It gains 3 electrons to achieve a stable octet, forming the $N^{3 -}$ ion.
Answer:
B. $N^{3 -}$
21.
Explanation:
Step1: Recall density formula
The density formula is $\rho=\frac{m}{V}$, where $\rho$ is density, $m$ is mass, and $V$ is volume. We can re - arrange it to solve for mass: $m = \rho\times V$.
Step2: Substitute values
Given $\rho = 0.608\ g/mL$ and $V=50.0\ mL$. Then $m=0.608\ g/mL\times50.0\ mL = 30.4\ g$.
Answer:
C. 30.4 g