2. calculate the density of a liquid in a beaker. the beaker has a mass of 15 grams when empty. the beaker plus an unknown liquid has a mass of 64 grams. what is the density (g/ml) of the liquid if its volume is 10. ml?

The density of the liquid is 4.9 g/ml

Explanation:

Density of a liquid is usually measured by filling a beaker of known weight and known capacity (total volume in ml you can fill it) and weighing it. The difference between the total weight (beaker+liquid) and the beaker weight is the liquid weight. Finally, you must divide liquid weight/volume to obtain density.

For the problem:

beaker=15 g

beaker+liquid=64 g

⇒liquid= 64 g - 15 g = 49 g

density= = = 4.9 g/ml

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.