Which sample represents a larger mass?

In the structure below octet rule is fulfilled for al atoms but lone electron pairs are not shown. Determine the molecular geometry around the N atom in this molecule.

Carbon tetrachloride, CCl4,  is a liquid with the density of 1.59 g/mL and molar mass of 153.8 g.  How many moles are present in a 10.0 mL sample of CCl4?

When a 45.0 g sample of a certain metal at 100.0 °C is dropped into a coffee cup calorimeter containing 100.0 g of water at 25.0 °C, the thermal equilibrium is reached at 37.0 °C.  What is the specific heat of the metal?  The specific heat of H2O(l) is 4.184 J·g–1·°C–1. Assume no heat is lost to the walls of the cup and to the surroundings.

Which of the following is mismatched:  

Place the following vessels in the order that blood would flow through them in the kidneys (some steps may be skipped): 1. renal artery 2. cortical radiate/interlobular artery  3. segmental artery 4. arcuate artery

Match the description on the left with the correct pressure on the right.

Which of the following phases or processes in the monthly female reproductive cycle occur simultaneously?

In relation to the kidney, the Juxtamedullary Nephron has the following features and responsibilities:

The  proliferative phase is best represented by letter ____.